Re: [PATCH v7 3/9] media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder

From: Hans Verkuil
Date: Tue Jan 19 2021 - 05:57:24 EST

Next message: Sergey Senozhatsky: "Re: [PATCH] printk: fix buffer overflow potential for print_text()"
Previous message: Greg Kroah-Hartman: "Re: [PATCH] ACPI / device_sysfs: Use OF_MODALIAS for "compatible" modalias"
Next in thread: kernel test robot: "Re: [PATCH v7 3/9] media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On 11/01/2021 20:28, Mirela Rabulea wrote:
> From: Mirela Rabulea <mirela.rabulea@xxxxxxx>
>
> V4L2 driver for the JPEG encoder/decoder from i.MX8QXP/i.MX8QM application
> processors.
> The multi-planar buffers API is used.
>
> Baseline and extended sequential jpeg decoding is supported.
> Progressive jpeg decoding is not supported by the IP.
> Supports encode and decode of various formats:
> YUV444, YUV422, YUV420, RGB, ARGB, Gray
> YUV420 is the only multi-planar format supported.
> Minimum resolution is 64 x 64, maximum 8192 x 8192.
> The alignment requirements for the resolution depend on the format,
> multiple of 16 resolutions should work for all formats.
>
> v4l2-compliance tests are passing, including the
> streaming tests, "v4l2-compliance -s"
>
> Signed-off-by: Mirela Rabulea <mirela.rabulea@xxxxxxx>
> ---
> Changes in v7:
> Add print_mxc_buf() to replace print_buf_preview() and print_nbuf_to_eoi(),
> and inside, use the print_hex_dump() from printk.h, also, print all the planes.
>
> drivers/media/platform/Kconfig | 2 +
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/imx-jpeg/Kconfig | 10 +
> drivers/media/platform/imx-jpeg/Makefile | 3 +
> drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c | 168 ++
> drivers/media/platform/imx-jpeg/mxc-jpeg-hw.h | 140 +
> drivers/media/platform/imx-jpeg/mxc-jpeg.c | 2289 +++++++++++++++++
> drivers/media/platform/imx-jpeg/mxc-jpeg.h | 184 ++
> 8 files changed, 2797 insertions(+)
> create mode 100644 drivers/media/platform/imx-jpeg/Kconfig
> create mode 100644 drivers/media/platform/imx-jpeg/Makefile
> create mode 100644 drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
> create mode 100644 drivers/media/platform/imx-jpeg/mxc-jpeg-hw.h
> create mode 100644 drivers/media/platform/imx-jpeg/mxc-jpeg.c
> create mode 100644 drivers/media/platform/imx-jpeg/mxc-jpeg.h

One high-level comment: why introduce the driver in patch 3/9 and then
change it again in 9/9? I would very much prefer to have just a single
patch that adds this driver, i.e. merge patch 3 and 9 into a single
patch.

>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index e419b18613c6..6244e573aea5 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -239,6 +239,8 @@ config VIDEO_IMX_PXP
> The i.MX Pixel Pipeline is a memory-to-memory engine for scaling,
> color space conversion, and rotation.
>
> +source "drivers/media/platform/imx-jpeg/Kconfig"
> +
> config VIDEO_MEDIATEK_JPEG
> tristate "Mediatek JPEG Codec driver"
> depends on MTK_IOMMU_V1 || MTK_IOMMU || COMPILE_TEST
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 9d4d6370908d..eedc14aafb32 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -21,6 +21,7 @@ obj-$(CONFIG_VIDEO_MX2_EMMAPRP) += mx2_emmaprp.o
> obj-$(CONFIG_VIDEO_CODA) += coda/
>
> obj-$(CONFIG_VIDEO_IMX_PXP) += imx-pxp.o
> +obj-$(CONFIG_VIDEO_IMX8_JPEG) += imx-jpeg/
>
> obj-$(CONFIG_VIDEO_MEM2MEM_DEINTERLACE) += m2m-deinterlace.o
>
> diff --git a/drivers/media/platform/imx-jpeg/Kconfig b/drivers/media/platform/imx-jpeg/Kconfig
> new file mode 100644
> index 000000000000..7cc89e5eff90
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/Kconfig
> @@ -0,0 +1,10 @@
> +# SPDX-License-Identifier: GPL-2.0
> +config VIDEO_IMX8_JPEG
> + tristate "IMX8 JPEG Encoder/Decoder"
> + depends on VIDEO_DEV && VIDEO_V4L2
> + select VIDEOBUF2_DMA_CONTIG
> + select V4L2_MEM2MEM_DEV
> + default m
> + help
> + This is a video4linux2 driver for the i.MX8 QXP/QM integrated
> + JPEG encoder/decoder.
> diff --git a/drivers/media/platform/imx-jpeg/Makefile b/drivers/media/platform/imx-jpeg/Makefile
> new file mode 100644
> index 000000000000..bf19c82e61b4
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0
> +mxc-jpeg-encdec-objs := mxc-jpeg-hw.o mxc-jpeg.o
> +obj-$(CONFIG_VIDEO_IMX8_JPEG) += mxc-jpeg-encdec.o
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
> new file mode 100644
> index 000000000000..29c604b1b179
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
> @@ -0,0 +1,168 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * i.MX8QXP/i.MX8QM JPEG encoder/decoder v4l2 driver
> + *
> + * Copyright 2018-2019 NXP
> + */
> +
> +#include <linux/delay.h>
> +#include <media/videobuf2-core.h>
> +#include "mxc-jpeg-hw.h"
> +
> +#define print_wrapper_reg(dev, base_address, reg_offset)\
> + internal_print_wrapper_reg(dev, (base_address), #reg_offset,\
> + (reg_offset))
> +#define internal_print_wrapper_reg(dev, base_address, reg_name, reg_offset) {\
> + int val;\
> + val = readl((base_address) + (reg_offset));\
> + dev_dbg(dev, "Wrapper reg %s = 0x%x\n", reg_name, val);\
> +}
> +
> +void print_descriptor_info(struct device *dev, struct mxc_jpeg_desc *desc)
> +{
> + dev_dbg(dev, " MXC JPEG NEXT_DESCPT_PTR 0x%x\n",
> + desc->next_descpt_ptr);
> + dev_dbg(dev, " MXC JPEG BUF_BASE0 0x%x\n", desc->buf_base0);
> + dev_dbg(dev, " MXC JPEG BUF_BASE1 0x%x\n", desc->buf_base1);
> + dev_dbg(dev, " MXC JPEG LINE_PITCH %d\n", desc->line_pitch);
> + dev_dbg(dev, " MXC JPEG STM_BUFBASE 0x%x\n", desc->stm_bufbase);
> + dev_dbg(dev, " MXC JPEG STM_BUFSIZE %d\n", desc->stm_bufsize);
> + dev_dbg(dev, " MXC JPEG IMGSIZE %x (%d x %d)\n", desc->imgsize,
> + desc->imgsize >> 16, desc->imgsize & 0xFFFF);
> + dev_dbg(dev, " MXC JPEG STM_CTRL 0x%x\n", desc->stm_ctrl);
> +}
> +
> +void print_cast_status(struct device *dev, void __iomem *reg,
> + unsigned int mode)
> +{
> + dev_dbg(dev, "CAST IP status regs:\n");
> + print_wrapper_reg(dev, reg, CAST_STATUS0);
> + print_wrapper_reg(dev, reg, CAST_STATUS1);
> + print_wrapper_reg(dev, reg, CAST_STATUS2);
> + print_wrapper_reg(dev, reg, CAST_STATUS3);
> + print_wrapper_reg(dev, reg, CAST_STATUS4);
> + print_wrapper_reg(dev, reg, CAST_STATUS5);
> + print_wrapper_reg(dev, reg, CAST_STATUS6);
> + print_wrapper_reg(dev, reg, CAST_STATUS7);
> + print_wrapper_reg(dev, reg, CAST_STATUS8);
> + print_wrapper_reg(dev, reg, CAST_STATUS9);
> + print_wrapper_reg(dev, reg, CAST_STATUS10);
> + print_wrapper_reg(dev, reg, CAST_STATUS11);
> + print_wrapper_reg(dev, reg, CAST_STATUS12);
> + print_wrapper_reg(dev, reg, CAST_STATUS13);
> + if (mode == MXC_JPEG_DECODE)
> + return;
> + print_wrapper_reg(dev, reg, CAST_STATUS14);
> + print_wrapper_reg(dev, reg, CAST_STATUS15);
> + print_wrapper_reg(dev, reg, CAST_STATUS16);
> + print_wrapper_reg(dev, reg, CAST_STATUS17);
> + print_wrapper_reg(dev, reg, CAST_STATUS18);
> + print_wrapper_reg(dev, reg, CAST_STATUS19);
> +}
> +
> +void print_wrapper_info(struct device *dev, void __iomem *reg)
> +{
> + dev_dbg(dev, "Wrapper regs:\n");
> + print_wrapper_reg(dev, reg, GLB_CTRL);
> + print_wrapper_reg(dev, reg, COM_STATUS);
> + print_wrapper_reg(dev, reg, BUF_BASE0);
> + print_wrapper_reg(dev, reg, BUF_BASE1);
> + print_wrapper_reg(dev, reg, LINE_PITCH);
> + print_wrapper_reg(dev, reg, STM_BUFBASE);
> + print_wrapper_reg(dev, reg, STM_BUFSIZE);
> + print_wrapper_reg(dev, reg, IMGSIZE);
> + print_wrapper_reg(dev, reg, STM_CTRL);
> +}
> +
> +void mxc_jpeg_enable_irq(void __iomem *reg, int slot)
> +{
> + writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_IRQ_EN));
> +}
> +
> +void mxc_jpeg_sw_reset(void __iomem *reg)
> +{
> + /*
> + * engine soft reset, internal state machine reset
> + * this will not reset registers, however, it seems
> + * the registers may remain inconsistent with the internal state
> + * so, on purpose, at least let GLB_CTRL bits clear after this reset
> + */
> + writel(GLB_CTRL_SFT_RST, reg + GLB_CTRL);
> +}
> +
> +void mxc_jpeg_enc_mode_conf(struct device *dev, void __iomem *reg)
> +{
> + dev_dbg(dev, "CAST Encoder CONFIG...\n");
> + /*
> + * "Config_Mode" enabled, "Config_Mode auto clear enabled",
> + */
> + writel(0xa0, reg + CAST_MODE);
> +
> + /* all markers and segments */
> + writel(0x3ff, reg + CAST_CFG_MODE);
> +
> + /* quality factor */
> + writel(0x4b, reg + CAST_QUALITY);
> +}
> +
> +void mxc_jpeg_enc_mode_go(struct device *dev, void __iomem *reg)
> +{
> + dev_dbg(dev, "CAST Encoder GO...\n");
> + /*
> + * "GO" enabled, "GO bit auto clear" enabled
> + */
> + writel(0x140, reg + CAST_MODE);
> +}
> +
> +void mxc_jpeg_dec_mode_go(struct device *dev, void __iomem *reg)
> +{
> + dev_dbg(dev, "CAST Decoder GO...\n");
> + writel(MXC_DEC_EXIT_IDLE_MODE, reg + CAST_CTRL);
> +}
> +
> +int mxc_jpeg_enable(void __iomem *reg)
> +{
> + u32 regval;
> +
> + writel(GLB_CTRL_JPG_EN, reg + GLB_CTRL);
> + regval = readl(reg);
> + return regval;
> +}
> +
> +void mxc_jpeg_enable_slot(void __iomem *reg, int slot)
> +{
> + u32 regval;
> +
> + regval = readl(reg + GLB_CTRL);
> + writel(GLB_CTRL_SLOT_EN(slot) | regval, reg + GLB_CTRL);
> +}
> +
> +void mxc_jpeg_set_l_endian(void __iomem *reg, int le)
> +{
> + u32 regval;
> +
> + regval = readl(reg + GLB_CTRL);
> + regval &= ~GLB_CTRL_L_ENDIAN(1); /* clear */
> + writel(GLB_CTRL_L_ENDIAN(le) | regval, reg + GLB_CTRL); /* set */
> +}
> +
> +void mxc_jpeg_set_bufsize(struct mxc_jpeg_desc *desc, u32 bufsize)
> +{
> + desc->stm_bufsize = bufsize;
> +}
> +
> +void mxc_jpeg_set_res(struct mxc_jpeg_desc *desc, u16 w, u16 h)
> +{
> + desc->imgsize = w << 16 | h;
> +}
> +
> +void mxc_jpeg_set_line_pitch(struct mxc_jpeg_desc *desc, u32 line_pitch)
> +{
> + desc->line_pitch = line_pitch;
> +}
> +
> +void mxc_jpeg_set_desc(u32 desc, void __iomem *reg, int slot)
> +{
> + writel(desc | MXC_NXT_DESCPT_EN,
> + reg + MXC_SLOT_OFFSET(slot, SLOT_NXT_DESCPT_PTR));
> +}
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.h b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.h
> new file mode 100644
> index 000000000000..ae70d3a0dc24
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.h
> @@ -0,0 +1,140 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * i.MX8QXP/i.MX8QM JPEG encoder/decoder v4l2 driver
> + *
> + * Copyright 2018-2019 NXP
> + */
> +
> +#ifndef _MXC_JPEG_HW_H
> +#define _MXC_JPEG_HW_H
> +
> +/* JPEG Decoder/Encoder Wrapper Register Map */
> +#define GLB_CTRL 0x0
> +#define COM_STATUS 0x4
> +#define BUF_BASE0 0x14
> +#define BUF_BASE1 0x18
> +#define LINE_PITCH 0x1C
> +#define STM_BUFBASE 0x20
> +#define STM_BUFSIZE 0x24
> +#define IMGSIZE 0x28
> +#define STM_CTRL 0x2C
> +
> +/* CAST JPEG-Decoder/Encoder Status Register Map (read-only)*/
> +#define CAST_STATUS0 0x100
> +#define CAST_STATUS1 0x104
> +#define CAST_STATUS2 0x108
> +#define CAST_STATUS3 0x10c
> +#define CAST_STATUS4 0x110
> +#define CAST_STATUS5 0x114
> +#define CAST_STATUS6 0x118
> +#define CAST_STATUS7 0x11c
> +#define CAST_STATUS8 0x120
> +#define CAST_STATUS9 0x124
> +#define CAST_STATUS10 0x128
> +#define CAST_STATUS11 0x12c
> +#define CAST_STATUS12 0x130
> +#define CAST_STATUS13 0x134
> +/* the following are for encoder only */
> +#define CAST_STATUS14 0x138
> +#define CAST_STATUS15 0x13c
> +#define CAST_STATUS16 0x140
> +#define CAST_STATUS17 0x144
> +#define CAST_STATUS18 0x148
> +#define CAST_STATUS19 0x14c
> +
> +/* CAST JPEG-Decoder Control Register Map (write-only) */
> +#define CAST_CTRL CAST_STATUS13
> +
> +/* CAST JPEG-Encoder Control Register Map (write-only) */
> +#define CAST_MODE CAST_STATUS0
> +#define CAST_CFG_MODE CAST_STATUS1
> +#define CAST_QUALITY CAST_STATUS2
> +#define CAST_RSVD CAST_STATUS3
> +#define CAST_REC_REGS_SEL CAST_STATUS4
> +#define CAST_LUMTH CAST_STATUS5
> +#define CAST_CHRTH CAST_STATUS6
> +#define CAST_NOMFRSIZE_LO CAST_STATUS7
> +#define CAST_NOMFRSIZE_HI CAST_STATUS8
> +#define CAST_OFBSIZE_LO CAST_STATUS9
> +#define CAST_OFBSIZE_HI CAST_STATUS10
> +
> +#define MXC_MAX_SLOTS 1 /* TODO use all 4 slots*/
> +/* JPEG-Decoder Wrapper Slot Registers 0..3 */
> +#define SLOT_BASE 0x10000
> +#define SLOT_STATUS 0x0
> +#define SLOT_IRQ_EN 0x4
> +#define SLOT_BUF_PTR 0x8
> +#define SLOT_CUR_DESCPT_PTR 0xC
> +#define SLOT_NXT_DESCPT_PTR 0x10
> +#define MXC_SLOT_OFFSET(slot, offset) ((SLOT_BASE * ((slot) + 1)) + (offset))
> +
> +/* GLB_CTRL fields */
> +#define GLB_CTRL_JPG_EN 0x1
> +#define GLB_CTRL_SFT_RST (0x1 << 1)
> +#define GLB_CTRL_DEC_GO (0x1 << 2)
> +#define GLB_CTRL_L_ENDIAN(le) ((le) << 3)
> +#define GLB_CTRL_SLOT_EN(slot) (0x1 << ((slot) + 4))
> +
> +/* COM_STAUS fields */
> +#define COM_STATUS_DEC_ONGOING(r) (((r) & (1 << 31)) >> 31)
> +#define COM_STATUS_CUR_SLOT(r) (((r) & (0x3 << 29)) >> 29)
> +
> +/* STM_CTRL fields */
> +#define STM_CTRL_PIXEL_PRECISION (0x1 << 2)
> +#define STM_CTRL_IMAGE_FORMAT(img_fmt) ((img_fmt) << 3)
> +#define STM_CTRL_IMAGE_FORMAT_MASK (0xF << 3)
> +#define STM_CTRL_BITBUF_PTR_CLR(clr) ((clr) << 7)
> +#define STM_CTRL_AUTO_START(go) ((go) << 8)
> +#define STM_CTRL_CONFIG_MOD(mod) ((mod) << 9)
> +
> +/* SLOT_STATUS fields for slots 0..3 */
> +#define SLOT_STATUS_FRMDONE (0x1 << 3)
> +#define SLOT_STATUS_ENC_CONFIG_ERR (0x1 << 8)
> +
> +/* SLOT_IRQ_EN fields TBD */
> +
> +#define MXC_NXT_DESCPT_EN 0x1
> +#define MXC_DEC_EXIT_IDLE_MODE 0x4
> +
> +/* JPEG-Decoder Wrapper - STM_CTRL Register Fields */
> +#define MXC_PIXEL_PRECISION(precision) ((precision) / 8 << 2)
> +enum mxc_jpeg_image_format {
> + MXC_JPEG_INVALID = -1,
> + MXC_JPEG_YUV420 = 0x0, /* 2 Plannar, Y=1st plane UV=2nd plane */
> + MXC_JPEG_YUV422 = 0x1, /* 1 Plannar, YUYV sequence */
> + MXC_JPEG_RGB = 0x2, /* RGBRGB packed format */
> + MXC_JPEG_YUV444 = 0x3, /* 1 Plannar, YUVYUV sequence */
> + MXC_JPEG_GRAY = 0x4, /* Y8 or Y12 or Single Component */
> + MXC_JPEG_RESERVED = 0x5,
> + MXC_JPEG_ARGB = 0x6,
> +};
> +
> +#include "mxc-jpeg.h"
> +void print_descriptor_info(struct device *dev, struct mxc_jpeg_desc *desc);
> +void print_cast_status(struct device *dev, void __iomem *reg,
> + unsigned int mode);
> +void print_wrapper_info(struct device *dev, void __iomem *reg);
> +void mxc_jpeg_sw_reset(void __iomem *reg);
> +int mxc_jpeg_enable(void __iomem *reg);
> +void wait_frmdone(struct device *dev, void __iomem *reg);
> +void mxc_jpeg_enc_mode_conf(struct device *dev, void __iomem *reg);
> +void mxc_jpeg_enc_mode_go(struct device *dev, void __iomem *reg);
> +void mxc_jpeg_dec_mode_go(struct device *dev, void __iomem *reg);
> +int mxc_jpeg_get_slot(void __iomem *reg);
> +u32 mxc_jpeg_get_offset(void __iomem *reg, int slot);
> +void mxc_jpeg_enable_slot(void __iomem *reg, int slot);
> +void mxc_jpeg_set_l_endian(void __iomem *reg, int le);
> +void mxc_jpeg_enable_irq(void __iomem *reg, int slot);
> +int mxc_jpeg_set_input(void __iomem *reg, u32 in_buf, u32 bufsize);
> +int mxc_jpeg_set_output(void __iomem *reg, u16 out_pitch, u32 out_buf,
> + u16 w, u16 h);
> +void mxc_jpeg_set_config_mode(void __iomem *reg, int config_mode);
> +int mxc_jpeg_set_params(struct mxc_jpeg_desc *desc, u32 bufsize, u16
> + out_pitch, u32 format);
> +void mxc_jpeg_set_bufsize(struct mxc_jpeg_desc *desc, u32 bufsize);
> +void mxc_jpeg_set_res(struct mxc_jpeg_desc *desc, u16 w, u16 h);
> +void mxc_jpeg_set_line_pitch(struct mxc_jpeg_desc *desc, u32 line_pitch);
> +void mxc_jpeg_set_desc(u32 desc, void __iomem *reg, int slot);
> +void mxc_jpeg_set_regs_from_desc(struct mxc_jpeg_desc *desc,
> + void __iomem *reg);
> +#endif
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
> new file mode 100644
> index 000000000000..9f1052779c58
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.c
> @@ -0,0 +1,2289 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * V4L2 driver for the JPEG encoder/decoder from i.MX8QXP/i.MX8QM application
> + * processors.
> + *
> + * The multi-planar buffers API is used.
> + *
> + * Baseline and extended sequential jpeg decoding is supported.
> + * Progressive jpeg decoding is not supported by the IP.
> + * Supports encode and decode of various formats:
> + * YUV444, YUV422, YUV420, RGB, ARGB, Gray
> + * YUV420 is the only multi-planar format supported.
> + * Minimum resolution is 64 x 64, maximum 8192 x 8192.
> + * To achieve 8192 x 8192, modify in defconfig: CONFIG_CMA_SIZE_MBYTES=320
> + * The alignment requirements for the resolution depend on the format,
> + * multiple of 16 resolutions should work for all formats.
> + * Special workarounds are made in the driver to support NV12 1080p.
> + * When decoding, the driver detects image resolution and pixel format
> + * from the jpeg stream, by parsing the jpeg markers.
> + *
> + * The IP has 4 slots available for context switching, but only slot 0
> + * was fully tested to work. Context switching is not used by the driver.
> + * Each driver instance (context) allocates a slot for itself, but this
> + * is postponed until device_run, to allow unlimited opens.
> + *
> + * The driver submits jobs to the IP by setting up a descriptor for the
> + * used slot, and then validating it. The encoder has an additional descriptor
> + * for the configuration phase. The driver expects FRM_DONE interrupt from
> + * IP to mark the job as finished.
> + *
> + * The decoder IP has some limitations regarding the component ID's,
> + * but the driver works around this by replacing them in the jpeg stream.
> + *
> + * A module parameter is available for debug purpose (jpeg_tracing), to enable
> + * it, enable dynamic debug for this module and:
> + * echo 1 > /sys/module/mxc_jpeg_encdec/parameters/jpeg_tracing
> + *
> + * This is inspired by the drivers/media/platform/s5p-jpeg driver
> + *
> + * Copyright 2018-2019 NXP
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/irqreturn.h>
> +#include <linux/interrupt.h>
> +#include <linux/pm_domain.h>
> +#include <linux/string.h>
> +
> +#include <media/v4l2-mem2mem.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-event.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "mxc-jpeg-hw.h"
> +#include "mxc-jpeg.h"
> +
> +static struct mxc_jpeg_fmt mxc_formats[] = {
> + {
> + .name = "JPEG",
> + .fourcc = V4L2_PIX_FMT_JPEG,
> + .colplanes = 1,
> + .flags = MXC_JPEG_FMT_TYPE_ENC,
> + },
> + {
> + .name = "RGB", /*RGBRGB packed format*/
> + .fourcc = V4L2_PIX_FMT_RGB24,
> + .depth = 24,
> + .colplanes = 1,
> + .h_align = 3,
> + .v_align = 3,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> + {
> + .name = "ARGB", /* ARGBARGB packed format */
> + .fourcc = V4L2_PIX_FMT_ARGB32,
> + .depth = 32,
> + .colplanes = 1,
> + .h_align = 3,
> + .v_align = 3,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> + {
> + .name = "YUV420", /* 1st plane = Y, 2nd plane = UV */
> + .fourcc = V4L2_PIX_FMT_NV12,
> + .depth = 12, /* 6 bytes (4Y + UV) for 4 pixels */
> + .colplanes = 2, /* 1 plane Y, 1 plane UV interleaved */
> + .h_align = 4,
> + .v_align = 4,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> + {
> + .name = "YUV422", /* YUYV */
> + .fourcc = V4L2_PIX_FMT_YUYV,
> + .depth = 16,
> + .colplanes = 1,
> + .h_align = 4,
> + .v_align = 3,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> + {
> + .name = "YUV444", /* YUVYUV */
> + .fourcc = V4L2_PIX_FMT_YUV24,
> + .depth = 24,
> + .colplanes = 1,
> + .h_align = 3,
> + .v_align = 3,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> + {
> + .name = "Gray", /* Gray (Y8/Y12) or Single Comp */
> + .fourcc = V4L2_PIX_FMT_GREY,
> + .depth = 8,
> + .colplanes = 1,
> + .h_align = 3,
> + .v_align = 3,
> + .flags = MXC_JPEG_FMT_TYPE_RAW,
> + },
> +};
> +
> +#define MXC_JPEG_NUM_FORMATS ARRAY_SIZE(mxc_formats)
> +
> +static const struct of_device_id mxc_jpeg_match[] = {
> + {
> + .compatible = "nxp,imx8qxp-jpgdec",
> + .data = (void *)MXC_JPEG_DECODE,
> + },
> + {
> + .compatible = "nxp,imx8qxp-jpgenc",
> + .data = (void *)MXC_JPEG_ENCODE,
> + },
> + { },
> +};
> +
> +/*
> + * default configuration stream, 64x64 yuv422
> + * split by JPEG marker, so it's easier to modify & use
> + */
> +static const unsigned char jpeg_soi[] = {
> + 0xFF, 0xD8
> +};
> +
> +static const unsigned char jpeg_app0[] = {
> + 0xFF, 0xE0,
> + 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00,
> + 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01,
> + 0x00, 0x00
> +};
> +
> +static const unsigned char jpeg_app14[] = {
> + 0xFF, 0xEE,
> + 0x00, 0x0E, 0x41, 0x64, 0x6F, 0x62, 0x65,
> + 0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00
> +};
> +
> +static const unsigned char jpeg_dqt[] = {
> + 0xFF, 0xDB,
> + 0x00, 0x84, 0x00, 0x10, 0x0B, 0x0C, 0x0E,
> + 0x0C, 0x0A, 0x10, 0x0E, 0x0D, 0x0E, 0x12,
> + 0x11, 0x10, 0x13, 0x18, 0x28, 0x1A, 0x18,
> + 0x16, 0x16, 0x18, 0x31, 0x23, 0x25, 0x1D,
> + 0x28, 0x3A, 0x33, 0x3D, 0x3C, 0x39, 0x33,
> + 0x38, 0x37, 0x40, 0x48, 0x5C, 0x4E, 0x40,
> + 0x44, 0x57, 0x45, 0x37, 0x38, 0x50, 0x6D,
> + 0x51, 0x57, 0x5F, 0x62, 0x67, 0x68, 0x67,
> + 0x3E, 0x4D, 0x71, 0x79, 0x70, 0x64, 0x78,
> + 0x5C, 0x65, 0x67, 0x63, 0x01, 0x11, 0x12,
> + 0x12, 0x18, 0x15, 0x18, 0x2F, 0x1A, 0x1A,
> + 0x2F, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
> + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
> +};
> +
> +static const unsigned char jpeg_sof_maximal[] = {
> + 0xFF, 0xC0,
> + 0x00, 0x14, 0x08, 0x00, 0x40, 0x00, 0x40,
> + 0x04, 0x01, 0x11, 0x00, 0x02, 0x11, 0x01,
> + 0x03, 0x11, 0x01, 0x04, 0x11, 0x01
> +};
> +
> +static const unsigned char jpeg_dht[] = {
> + 0xFF, 0xC4,
> + 0x01, 0xA2, 0x00, 0x00, 0x01, 0x05, 0x01,
> + 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
> + 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
> + 0x09, 0x0A, 0x0B, 0x10, 0x00, 0x02, 0x01,
> + 0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05,
> + 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D, 0x01,
> + 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
> + 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61,
> + 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91,
> + 0xA1, 0x08, 0x23, 0x42, 0xB1, 0xC1, 0x15,
> + 0x52, 0xD1, 0xF0, 0x24, 0x33, 0x62, 0x72,
> + 0x82, 0x09, 0x0A, 0x16, 0x17, 0x18, 0x19,
> + 0x1A, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A,
> + 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
> + 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
> + 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
> + 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67,
> + 0x68, 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76,
> + 0x77, 0x78, 0x79, 0x7A, 0x83, 0x84, 0x85,
> + 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93,
> + 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A,
> + 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
> + 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
> + 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4,
> + 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
> + 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
> + 0xDA, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6,
> + 0xE7, 0xE8, 0xE9, 0xEA, 0xF1, 0xF2, 0xF3,
> + 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA,
> + 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01,
> + 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,
> + 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
> + 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
> + 0x0B, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04,
> + 0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04,
> + 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02,
> + 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
> + 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13,
> + 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
> + 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52,
> + 0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16,
> + 0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18,
> + 0x19, 0x1A, 0x26, 0x27, 0x28, 0x29, 0x2A,
> + 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x43,
> + 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A,
> + 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
> + 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
> + 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77,
> + 0x78, 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85,
> + 0x86, 0x87, 0x88, 0x89, 0x8A, 0x92, 0x93,
> + 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A,
> + 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
> + 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
> + 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4,
> + 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
> + 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9,
> + 0xDA, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
> + 0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5,
> + 0xF6, 0xF7, 0xF8, 0xF9, 0xFA
> +};
> +
> +static const unsigned char jpeg_dri[] = {
> + 0xFF, 0xDD,
> + 0x00, 0x04, 0x00, 0x20
> +};
> +
> +static const unsigned char jpeg_sos_maximal[] = {
> + 0xFF, 0xDA,
> + 0x00, 0x0C, 0x04, 0x01, 0x00, 0x02, 0x11, 0x03,
> + 0x11, 0x04, 0x11, 0x00, 0x3F, 0x00
> +};
> +
> +static const unsigned char jpeg_eoi[] = {
> + 0xFF, 0xD9
> +};
> +
> +struct mxc_jpeg_src_buf {
> + /* common v4l buffer stuff -- must be first */
> + struct vb2_v4l2_buffer b;
> + struct list_head list;
> +
> + /* mxc-jpeg specific */
> + bool dht_needed;
> + bool jpeg_parse_error;
> +};
> +
> +static inline struct mxc_jpeg_src_buf *vb2_to_mxc_buf(struct vb2_buffer *vb)
> +{
> + return container_of(to_vb2_v4l2_buffer(vb),
> + struct mxc_jpeg_src_buf, b);
> +}
> +
> +static unsigned int debug;
> +module_param(debug, int, 0644);
> +MODULE_PARM_DESC(debug, "Debug level (0-3)");
> +
> +static void _bswap16(u16 *a)
> +{
> + *a = ((*a & 0x00FF) << 8) | ((*a & 0xFF00) >> 8);
> +}
> +
> +static void print_mxc_buf(struct mxc_jpeg_dev *jpeg, struct vb2_buffer *buf,
> + unsigned long len)
> +{
> + unsigned int plane_no;
> + u32 dma_addr;
> + void *vaddr;
> + unsigned long payload;
> +
> + if (debug < 3)
> + return;
> +
> + for (plane_no = 0; plane_no < buf->num_planes; plane_no++) {
> + payload = vb2_get_plane_payload(buf, plane_no);
> + if (len == 0)
> + len = payload;
> + dma_addr = vb2_dma_contig_plane_dma_addr(buf, plane_no);
> + vaddr = vb2_plane_vaddr(buf, plane_no);
> + v4l2_dbg(3, debug, &jpeg->v4l2_dev,
> + "plane %d (vaddr=%p dma_addr=%x payload=%ld):",
> + plane_no, vaddr, dma_addr, payload);
> + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
> + vaddr, len, false);
> + }
> +}
> +
> +static inline struct mxc_jpeg_ctx *mxc_jpeg_fh_to_ctx(struct v4l2_fh *fh)
> +{
> + return container_of(fh, struct mxc_jpeg_ctx, fh);
> +}
> +
> +static int enum_fmt(struct mxc_jpeg_fmt *mxc_formats, int n,
> + struct v4l2_fmtdesc *f, u32 type)
> +{
> + int i, num = 0;
> +
> + for (i = 0; i < n; ++i) {
> + if (mxc_formats[i].flags == type) {
> + /* index-th format of searched type found ? */
> + if (num == f->index)
> + break;
> + /* Correct type but haven't reached our index yet,
> + * just increment per-type index
> + */
> + ++num;
> + }
> + }
> +
> + /* Format not found */
> + if (i >= n)
> + return -EINVAL;
> +
> + strscpy(f->description, mxc_formats[i].name, sizeof(f->description));
> + f->pixelformat = mxc_formats[i].fourcc;
> +
> + return 0;
> +}
> +
> +static struct mxc_jpeg_fmt *mxc_jpeg_find_format(struct mxc_jpeg_ctx *ctx,
> + u32 pixelformat)
> +{
> + unsigned int k;
> +
> + for (k = 0; k < MXC_JPEG_NUM_FORMATS; k++) {
> + struct mxc_jpeg_fmt *fmt = &mxc_formats[k];
> +
> + if (fmt->fourcc == pixelformat)
> + return fmt;
> + }
> + return NULL;
> +}
> +
> +static enum mxc_jpeg_image_format mxc_jpeg_fourcc_to_imgfmt(u32 fourcc)
> +{
> + switch (fourcc) {
> + case V4L2_PIX_FMT_GREY:
> + return MXC_JPEG_GRAY;
> + case V4L2_PIX_FMT_YUYV:
> + return MXC_JPEG_YUV422;
> + case V4L2_PIX_FMT_NV12:
> + return MXC_JPEG_YUV420;
> + case V4L2_PIX_FMT_YUV24:
> + return MXC_JPEG_YUV444;
> + case V4L2_PIX_FMT_RGB24:
> + return MXC_JPEG_RGB;
> + case V4L2_PIX_FMT_ARGB32:
> + return MXC_JPEG_ARGB;
> + default:
> + return MXC_JPEG_INVALID;
> + }
> +}
> +
> +static int mxc_jpeg_imgfmt_to_fourcc(enum mxc_jpeg_image_format imgfmt,
> + u32 *fourcc)
> +{
> + switch (imgfmt) {
> + case MXC_JPEG_GRAY:
> + *fourcc = V4L2_PIX_FMT_GREY;
> + return 0;
> + case MXC_JPEG_YUV422:
> + *fourcc = V4L2_PIX_FMT_YUYV;
> + return 0;
> + case MXC_JPEG_YUV420:
> + *fourcc = V4L2_PIX_FMT_NV12;
> + return 0;
> + case MXC_JPEG_YUV444:
> + *fourcc = V4L2_PIX_FMT_YUV24;
> + return 0;
> + case MXC_JPEG_RGB:
> + *fourcc = V4L2_PIX_FMT_RGB24;
> + return 0;
> + case MXC_JPEG_ARGB:
> + *fourcc = V4L2_PIX_FMT_ARGB32;
> + return 0;
> + default:
> + return 1;
> + }
> +}
> +
> +static struct mxc_jpeg_q_data *mxc_jpeg_get_q_data(struct mxc_jpeg_ctx *ctx,
> + enum v4l2_buf_type type)
> +{
> + if (V4L2_TYPE_IS_OUTPUT(type))
> + return &ctx->out_q;
> + return &ctx->cap_q;
> +}
> +
> +static void mxc_jpeg_addrs(struct mxc_jpeg_desc *desc,
> + struct vb2_buffer *raw_buf,
> + struct vb2_buffer *jpeg_buf, int offset)
> +{
> + int img_fmt = desc->stm_ctrl & STM_CTRL_IMAGE_FORMAT_MASK;
> +
> + desc->buf_base0 = vb2_dma_contig_plane_dma_addr(raw_buf, 0);
> + desc->buf_base1 = 0;
> + if (img_fmt == STM_CTRL_IMAGE_FORMAT(MXC_JPEG_YUV420)) {
> + WARN_ON(raw_buf->num_planes < 2);
> + desc->buf_base1 = vb2_dma_contig_plane_dma_addr(raw_buf, 1);
> + }
> + desc->stm_bufbase = vb2_dma_contig_plane_dma_addr(jpeg_buf, 0) +
> + offset;
> +}
> +
> +static void notify_eos(struct mxc_jpeg_ctx *ctx)
> +{
> + const struct v4l2_event ev = {
> + .type = V4L2_EVENT_EOS
> + };
> +
> + dev_dbg(ctx->mxc_jpeg->dev, "Notify app event EOS reached");
> + v4l2_event_queue_fh(&ctx->fh, &ev);
> +}
> +
> +static void notify_src_chg(struct mxc_jpeg_ctx *ctx)
> +{
> + const struct v4l2_event ev = {
> + .type = V4L2_EVENT_SOURCE_CHANGE,
> + .u.src_change.changes =
> + V4L2_EVENT_SRC_CH_RESOLUTION,
> + };
> +
> + dev_dbg(ctx->mxc_jpeg->dev, "Notify app event SRC_CH_RESOLUTION");
> + v4l2_event_queue_fh(&ctx->fh, &ev);
> +}
> +
> +static int mxc_get_free_slot(struct mxc_jpeg_slot_data slot_data[], int n)
> +{
> + int free_slot = 0;
> +
> + while (slot_data[free_slot].used && free_slot < n)
> + free_slot++;
> +
> + return free_slot; /* >=n when there are no more free slots */
> +}
> +
> +static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg,
> + unsigned int slot)
> +{
> + struct mxc_jpeg_desc *desc;
> + struct mxc_jpeg_desc *cfg_desc;
> + void *cfg_stm;
> +
> + if (jpeg->slot_data[slot].desc)
> + goto skip_alloc; /* already allocated, reuse it */
> +
> + /* allocate descriptor for decoding/encoding phase */
> + desc = dma_alloc_coherent(jpeg->dev,
> + sizeof(struct mxc_jpeg_desc),
> + &jpeg->slot_data[slot].desc_handle,
> + GFP_ATOMIC);
> + if (!desc)
> + goto err;
> + jpeg->slot_data[slot].desc = desc;
> +
> + /* allocate descriptor for configuration phase (encoder only) */
> + cfg_desc = dma_alloc_coherent(jpeg->dev,
> + sizeof(struct mxc_jpeg_desc),
> + &jpeg->slot_data[slot].cfg_desc_handle,
> + GFP_ATOMIC);
> + if (!cfg_desc)
> + goto err;
> + jpeg->slot_data[slot].cfg_desc = cfg_desc;
> +
> + /* allocate configuration stream */
> + cfg_stm = dma_alloc_coherent(jpeg->dev,
> + MXC_JPEG_MAX_CFG_STREAM,
> + &jpeg->slot_data[slot].cfg_stream_handle,
> + GFP_ATOMIC);
> + if (!cfg_stm)
> + goto err;
> + jpeg->slot_data[slot].cfg_stream_vaddr = cfg_stm;
> +
> +skip_alloc:
> + jpeg->slot_data[slot].used = true;
> +
> + return true;
> +err:
> + dev_err(jpeg->dev, "Could not allocate descriptors for slot %d", slot);
> +
> + return false;
> +}
> +
> +static void mxc_jpeg_free_slot_data(struct mxc_jpeg_dev *jpeg,
> + unsigned int slot)
> +{
> + if (slot >= MXC_MAX_SLOTS) {
> + dev_err(jpeg->dev, "Invalid slot %d, nothing to free.", slot);
> + return;
> + }
> +
> + /* free descriptor for decoding/encoding phase */
> + dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
> + jpeg->slot_data[slot].desc,
> + jpeg->slot_data[slot].desc_handle);
> +
> + /* free descriptor for encoder configuration phase / decoder DHT */
> + dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
> + jpeg->slot_data[slot].cfg_desc,
> + jpeg->slot_data[slot].cfg_desc_handle);
> +
> + /* free configuration stream */
> + dma_free_coherent(jpeg->dev, MXC_JPEG_MAX_CFG_STREAM,
> + jpeg->slot_data[slot].cfg_stream_vaddr,
> + jpeg->slot_data[slot].cfg_stream_handle);
> +
> + jpeg->slot_data[slot].used = false;
> +}
> +
> +static irqreturn_t mxc_jpeg_dec_irq(int irq, void *priv)
> +{
> + struct mxc_jpeg_dev *jpeg = priv;
> + struct mxc_jpeg_ctx *ctx;
> + void __iomem *reg = jpeg->base_reg;
> + struct device *dev = jpeg->dev;
> + struct vb2_v4l2_buffer *src_buf, *dst_buf;
> + struct mxc_jpeg_src_buf *jpeg_src_buf;
> + enum vb2_buffer_state buf_state;
> + u32 dec_ret, com_status;
> + unsigned long payload;
> + struct mxc_jpeg_q_data *q_data;
> + enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + unsigned int slot;
> +
> + spin_lock(&jpeg->hw_lock);
> +
> + com_status = readl(reg + COM_STATUS);
> + slot = COM_STATUS_CUR_SLOT(com_status);
> + dev_dbg(dev, "Irq %d on slot %d.\n", irq, slot);
> +
> + ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
> + if (!ctx) {
> + dev_err(dev,
> + "Instance released before the end of transaction.\n");
> + /* soft reset only resets internal state, not registers */
> + mxc_jpeg_sw_reset(reg);
> + /* clear all interrupts */
> + writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
> + goto job_unlock;
> + }
> +
> + if (slot != ctx->slot) {
> + /* TODO investigate when adding multi-instance support */
> + dev_warn(dev, "IRQ slot %d != context slot %d.\n",
> + slot, ctx->slot);
> + goto job_unlock;
> + }
> +
> + dec_ret = readl(reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
> + writel(dec_ret, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS)); /* w1c */
> +
> + dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
> + src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
> + jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
> +
> + if (dec_ret & SLOT_STATUS_ENC_CONFIG_ERR) {
> + u32 ret = readl(reg + CAST_STATUS12);
> +
> + dev_err(dev, "Encoder/decoder error, status=0x%08x", ret);
> + mxc_jpeg_sw_reset(reg);
> + buf_state = VB2_BUF_STATE_ERROR;
> + goto buffers_done;
> + }
> +
> + if (!(dec_ret & SLOT_STATUS_FRMDONE))
> + goto job_unlock;
> +
> + if (jpeg->mode == MXC_JPEG_ENCODE &&
> + ctx->enc_state == MXC_JPEG_ENC_CONF) {
> + ctx->enc_state = MXC_JPEG_ENCODING;
> + dev_dbg(dev, "Encoder config finished. Start encoding...\n");
> + mxc_jpeg_enc_mode_go(dev, reg);
> + goto job_unlock;
> + }
> + if (jpeg->mode == MXC_JPEG_DECODE && jpeg_src_buf->dht_needed) {
> + jpeg_src_buf->dht_needed = false;
> + dev_dbg(dev, "Decoder DHT cfg finished. Start decoding...\n");
> + goto job_unlock;
> + }
> + if (jpeg->mode == MXC_JPEG_ENCODE) {
> + payload = readl(reg + MXC_SLOT_OFFSET(slot, SLOT_BUF_PTR));
> + vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload);
> + dev_dbg(dev, "Encoding finished, payload size: %ld\n",
> + payload);
> + } else {
> + q_data = mxc_jpeg_get_q_data(ctx, cap_type);
> + payload = q_data->sizeimage[0];
> + vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload);
> + vb2_set_plane_payload(&dst_buf->vb2_buf, 1, 0);
> + if (q_data->fmt->colplanes == 2) {
> + payload = q_data->sizeimage[1];
> + vb2_set_plane_payload(&dst_buf->vb2_buf, 1, payload);
> + }
> + dev_dbg(dev, "Decoding finished, payload size: %ld + %ld\n",
> + vb2_get_plane_payload(&dst_buf->vb2_buf, 0),
> + vb2_get_plane_payload(&dst_buf->vb2_buf, 1));
> + }
> +
> + /* short preview of the results */
> + dev_dbg(dev, "src_buf preview: ");
> + print_mxc_buf(jpeg, &src_buf->vb2_buf, 32);
> + dev_dbg(dev, "dst_buf preview: ");
> + print_mxc_buf(jpeg, &dst_buf->vb2_buf, 32);
> + buf_state = VB2_BUF_STATE_DONE;
> +
> +buffers_done:
> + jpeg->slot_data[slot].used = false; /* unused, but don't free */
> + v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
> + v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
> + v4l2_m2m_buf_done(src_buf, buf_state);
> + v4l2_m2m_buf_done(dst_buf, buf_state);
> + spin_unlock(&jpeg->hw_lock);
> + v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
> + return IRQ_HANDLED;
> +job_unlock:
> + spin_unlock(&jpeg->hw_lock);
> + return IRQ_HANDLED;
> +}
> +
> +static int mxc_jpeg_fixup_sof(struct mxc_jpeg_sof *sof,
> + u32 fourcc,
> + u16 w, u16 h)
> +{
> + int sof_length;
> +
> + sof->precision = 8; /* TODO allow 8/12 bit precision*/
> + sof->height = h;
> + _bswap16(&sof->height);
> + sof->width = w;
> + _bswap16(&sof->width);
> +
> + switch (fourcc) {
> + case V4L2_PIX_FMT_NV12:
> + sof->components_no = 3;
> + sof->comp[0].v = 0x2;
> + sof->comp[0].h = 0x2;
> + break;
> + case V4L2_PIX_FMT_YUYV:
> + sof->components_no = 3;
> + sof->comp[0].v = 0x1;
> + sof->comp[0].h = 0x2;
> + break;
> + case V4L2_PIX_FMT_YUV24:
> + case V4L2_PIX_FMT_RGB24:
> + default:
> + sof->components_no = 3;
> + break;
> + case V4L2_PIX_FMT_ARGB32:
> + sof->components_no = 4;
> + break;
> + case V4L2_PIX_FMT_GREY:
> + sof->components_no = 1;
> + break;
> + }
> + sof_length = 8 + 3 * sof->components_no;
> + sof->length = sof_length;
> + _bswap16(&sof->length);
> +
> + return sof_length; /* not swaped */
> +}
> +
> +static int mxc_jpeg_fixup_sos(struct mxc_jpeg_sos *sos,
> + u32 fourcc)
> +{
> + int sos_length;
> + u8 *sof_u8 = (u8 *)sos;
> +
> + switch (fourcc) {
> + case V4L2_PIX_FMT_NV12:
> + sos->components_no = 3;
> + break;
> + case V4L2_PIX_FMT_YUYV:
> + sos->components_no = 3;
> + break;
> + case V4L2_PIX_FMT_YUV24:
> + case V4L2_PIX_FMT_RGB24:
> + default:
> + sos->components_no = 3;
> + break;
> + case V4L2_PIX_FMT_ARGB32:
> + sos->components_no = 4;
> + break;
> + case V4L2_PIX_FMT_GREY:
> + sos->components_no = 1;
> + break;
> + }
> + sos_length = 6 + 2 * sos->components_no;
> + sos->length = sos_length;
> + _bswap16(&sos->length);
> +
> + /* SOS ignorable bytes, not so ignorable after all */
> + sof_u8[sos_length - 1] = 0x0;
> + sof_u8[sos_length - 2] = 0x3f;
> + sof_u8[sos_length - 3] = 0x0;
> +
> + return sos_length; /* not swaped */
> +}
> +
> +static unsigned int mxc_jpeg_setup_cfg_stream(void *cfg_stream_vaddr,
> + u32 fourcc,
> + u16 w, u16 h)
> +{
> + unsigned int offset = 0;
> + u8 *cfg = (u8 *)cfg_stream_vaddr;
> + struct mxc_jpeg_sof *sof;
> + struct mxc_jpeg_sos *sos;
> +
> + memcpy(cfg + offset, jpeg_soi, ARRAY_SIZE(jpeg_soi));
> + offset += ARRAY_SIZE(jpeg_soi);
> +
> + if (fourcc == V4L2_PIX_FMT_RGB24 ||
> + fourcc == V4L2_PIX_FMT_ARGB32) {
> + memcpy(cfg + offset, jpeg_app14, sizeof(jpeg_app14));
> + offset += sizeof(jpeg_app14);
> + } else {
> + memcpy(cfg + offset, jpeg_app0, sizeof(jpeg_app0));
> + offset += sizeof(jpeg_app0);
> + }
> +
> + memcpy(cfg + offset, jpeg_dqt, sizeof(jpeg_dqt));
> + offset += sizeof(jpeg_dqt);
> +
> + memcpy(cfg + offset, jpeg_sof_maximal, sizeof(jpeg_sof_maximal));
> + offset += 2; /* skip marker ID */
> + sof = (struct mxc_jpeg_sof *)(cfg + offset);
> + offset += mxc_jpeg_fixup_sof(sof, fourcc, w, h);
> +
> + memcpy(cfg + offset, jpeg_dht, sizeof(jpeg_dht));
> + offset += sizeof(jpeg_dht);
> +
> + memcpy(cfg + offset, jpeg_dri, sizeof(jpeg_dri));
> + offset += sizeof(jpeg_dri);
> +
> + memcpy(cfg + offset, jpeg_sos_maximal, sizeof(jpeg_sos_maximal));
> + offset += 2; /* skip marker ID */
> + sos = (struct mxc_jpeg_sos *)(cfg + offset);
> + offset += mxc_jpeg_fixup_sos(sos, fourcc);
> +
> + memcpy(cfg + offset, jpeg_eoi, sizeof(jpeg_eoi));
> + offset += sizeof(jpeg_eoi);
> +
> + return offset;
> +}
> +
> +static void mxc_jpeg_config_dec_desc(struct vb2_buffer *out_buf,
> + struct mxc_jpeg_ctx *ctx,
> + struct vb2_buffer *src_buf,
> + struct vb2_buffer *dst_buf)
> +{
> + enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + struct mxc_jpeg_q_data *q_data_cap;
> + enum mxc_jpeg_image_format img_fmt;
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + void __iomem *reg = jpeg->base_reg;
> + unsigned int slot = ctx->slot;
> + struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
> + struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
> + dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
> + dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
> + dma_addr_t cfg_stream_handle = jpeg->slot_data[slot].cfg_stream_handle;
> + unsigned int *cfg_size = &jpeg->slot_data[slot].cfg_stream_size;
> + void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
> + struct mxc_jpeg_src_buf *jpeg_src_buf;
> +
> + jpeg_src_buf = vb2_to_mxc_buf(src_buf);
> +
> + /* setup the decoding descriptor */
> + desc->next_descpt_ptr = 0; /* end of chain */
> + q_data_cap = mxc_jpeg_get_q_data(ctx, cap_type);
> + desc->imgsize = q_data_cap->w_adjusted << 16 | q_data_cap->h_adjusted;
> + img_fmt = mxc_jpeg_fourcc_to_imgfmt(q_data_cap->fmt->fourcc);
> + desc->stm_ctrl &= ~STM_CTRL_IMAGE_FORMAT(0xF); /* clear image format */
> + desc->stm_ctrl |= STM_CTRL_IMAGE_FORMAT(img_fmt);
> + desc->line_pitch = q_data_cap->bytesperline[0];
> + mxc_jpeg_addrs(desc, dst_buf, src_buf, 0);
> + mxc_jpeg_set_bufsize(desc, ALIGN(vb2_plane_size(src_buf, 0), 1024));
> + print_descriptor_info(jpeg->dev, desc);
> +
> + if (!jpeg_src_buf->dht_needed) {
> + /* validate the decoding descriptor */
> + mxc_jpeg_set_desc(desc_handle, reg, slot);
> + return;
> + }
> +
> + /*
> + * if a default huffman table is needed, use the config descriptor to
> + * inject a DHT, by chaining it before the decoding descriptor
> + */
> + *cfg_size = mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
> + V4L2_PIX_FMT_YUYV,
> + MXC_JPEG_MIN_WIDTH,
> + MXC_JPEG_MIN_HEIGHT);
> + cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
> + cfg_desc->buf_base0 = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
> + cfg_desc->buf_base1 = 0;
> + cfg_desc->imgsize = MXC_JPEG_MIN_WIDTH << 16;
> + cfg_desc->imgsize |= MXC_JPEG_MIN_HEIGHT;
> + cfg_desc->line_pitch = MXC_JPEG_MIN_WIDTH * 2;
> + cfg_desc->stm_ctrl = STM_CTRL_IMAGE_FORMAT(MXC_JPEG_YUV422);
> + cfg_desc->stm_bufbase = cfg_stream_handle;
> + cfg_desc->stm_bufsize = ALIGN(*cfg_size, 1024);
> + print_descriptor_info(jpeg->dev, cfg_desc);
> +
> + /* validate the configuration descriptor */
> + mxc_jpeg_set_desc(cfg_desc_handle, reg, slot);
> +}
> +
> +static void mxc_jpeg_config_enc_desc(struct vb2_buffer *out_buf,
> + struct mxc_jpeg_ctx *ctx,
> + struct vb2_buffer *src_buf,
> + struct vb2_buffer *dst_buf)
> +{
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + void __iomem *reg = jpeg->base_reg;
> + unsigned int slot = ctx->slot;
> + struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
> + struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
> + dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
> + dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
> + void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
> + struct mxc_jpeg_q_data *q_data;
> + enum mxc_jpeg_image_format img_fmt;
> + int w, h;
> +
> + q_data = mxc_jpeg_get_q_data(ctx, src_buf->vb2_queue->type);
> +
> + jpeg->slot_data[slot].cfg_stream_size =
> + mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
> + q_data->fmt->fourcc,
> + q_data->w_adjusted,
> + q_data->h_adjusted);
> +
> + /* chain the config descriptor with the encoding descriptor */
> + cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
> +
> + cfg_desc->buf_base0 = jpeg->slot_data[slot].cfg_stream_handle;
> + cfg_desc->buf_base1 = 0;
> + cfg_desc->line_pitch = 0;
> + cfg_desc->stm_bufbase = 0; /* no output expected */
> + cfg_desc->stm_bufsize = 0x0;
> + cfg_desc->imgsize = 0;
> + cfg_desc->stm_ctrl = STM_CTRL_CONFIG_MOD(1);
> +
> + desc->next_descpt_ptr = 0; /* end of chain */
> +
> + /* use adjusted resolution for CAST IP job */
> + w = q_data->w_adjusted;
> + h = q_data->h_adjusted;
> + mxc_jpeg_set_res(desc, w, h);
> + mxc_jpeg_set_line_pitch(desc, w * (q_data->fmt->depth / 8));
> + mxc_jpeg_set_bufsize(desc, desc->line_pitch * h);
> + img_fmt = mxc_jpeg_fourcc_to_imgfmt(q_data->fmt->fourcc);
> + if (img_fmt == MXC_JPEG_INVALID)
> + dev_err(jpeg->dev, "No valid image format detected\n");
> + desc->stm_ctrl = STM_CTRL_CONFIG_MOD(0) |
> + STM_CTRL_IMAGE_FORMAT(img_fmt);
> + mxc_jpeg_addrs(desc, src_buf, dst_buf, 0);
> + dev_dbg(jpeg->dev, "cfg_desc - 0x%llx:\n", cfg_desc_handle);
> + print_descriptor_info(jpeg->dev, cfg_desc);
> + dev_dbg(jpeg->dev, "enc desc - 0x%llx:\n", desc_handle);
> + print_descriptor_info(jpeg->dev, desc);
> + print_wrapper_info(jpeg->dev, reg);
> + print_cast_status(jpeg->dev, reg, MXC_JPEG_ENCODE);
> +
> + /* validate the configuration descriptor */
> + mxc_jpeg_set_desc(cfg_desc_handle, reg, slot);
> +}
> +
> +static void mxc_jpeg_device_run(void *priv)
> +{
> + struct mxc_jpeg_ctx *ctx = priv;
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + void __iomem *reg = jpeg->base_reg;
> + struct device *dev = jpeg->dev;
> + struct vb2_v4l2_buffer *src_buf, *dst_buf;
> + unsigned long flags;
> + struct mxc_jpeg_q_data *q_data_cap, *q_data_out;
> + struct mxc_jpeg_src_buf *jpeg_src_buf;
> +
> + spin_lock_irqsave(&ctx->mxc_jpeg->hw_lock, flags);
> + src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
> + dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
> + if (!src_buf || !dst_buf) {
> + dev_err(dev, "Null src or dst buf\n");
> + goto end;
> + }
> +
> + q_data_cap = mxc_jpeg_get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
> + if (!q_data_cap)
> + goto end;
> + q_data_out = mxc_jpeg_get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
> + if (!q_data_out)
> + goto end;
> + src_buf->sequence = q_data_out->sequence++;
> + dst_buf->sequence = q_data_cap->sequence++;
> +
> + v4l2_m2m_buf_copy_metadata(src_buf, dst_buf, true);
> +
> + jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
> + if (jpeg_src_buf->jpeg_parse_error) {
> + jpeg->slot_data[ctx->slot].used = false;
> + v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
> + v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
> + v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);
> + v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_ERROR);
> + spin_unlock_irqrestore(&ctx->mxc_jpeg->hw_lock, flags);
> + v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
> +
> + return;
> + }
> +
> + /*
> + * TODO: this reset should be removed, once we figure out
> + * how to overcome hardware issues both on encoder and decoder
> + */
> + mxc_jpeg_sw_reset(reg);
> + mxc_jpeg_enable(reg);
> + mxc_jpeg_set_l_endian(reg, 1);
> +
> + ctx->slot = mxc_get_free_slot(jpeg->slot_data, MXC_MAX_SLOTS);
> + if (ctx->slot >= MXC_MAX_SLOTS) {
> + dev_err(dev, "No more free slots\n");
> + goto end;
> + }
> + if (!mxc_jpeg_alloc_slot_data(jpeg, ctx->slot)) {
> + dev_err(dev, "Canot allocate slot data\n");
> + goto end;
> + }
> +
> + mxc_jpeg_enable_slot(reg, ctx->slot);
> + mxc_jpeg_enable_irq(reg, ctx->slot);
> +
> + if (jpeg->mode == MXC_JPEG_ENCODE) {
> + dev_dbg(dev, "Encoding on slot %d\n", ctx->slot);
> + ctx->enc_state = MXC_JPEG_ENC_CONF;
> + mxc_jpeg_config_enc_desc(&dst_buf->vb2_buf, ctx,
> + &src_buf->vb2_buf, &dst_buf->vb2_buf);
> + mxc_jpeg_enc_mode_conf(dev, reg); /* start config phase */
> + } else {
> + dev_dbg(dev, "Decoding on slot %d\n", ctx->slot);
> + print_mxc_buf(jpeg, &src_buf->vb2_buf, 0);
> + mxc_jpeg_config_dec_desc(&dst_buf->vb2_buf, ctx,
> + &src_buf->vb2_buf, &dst_buf->vb2_buf);
> + mxc_jpeg_dec_mode_go(dev, reg);
> + }
> +end:
> + spin_unlock_irqrestore(&ctx->mxc_jpeg->hw_lock, flags);
> +}
> +
> +static int mxc_jpeg_try_decoder_cmd(struct file *file, void *fh,
> + struct v4l2_decoder_cmd *c)
> +{
> + if (c->cmd != V4L2_DEC_CMD_STOP && c->cmd != V4L2_DEC_CMD_START)
> + return -EINVAL;
> +
> + c->flags = 0;
> +
> + if (c->cmd == V4L2_DEC_CMD_START) {
> + c->start.speed = 0;
> + c->start.format = 0;
> + }
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_decoder_cmd(struct file *file, void *priv,
> + struct v4l2_decoder_cmd *cmd)
> +{
> + struct v4l2_fh *fh = file->private_data;
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(fh);
> + struct device *dev = ctx->mxc_jpeg->dev;
> + int ret;
> +
> + ret = mxc_jpeg_try_decoder_cmd(file, fh, cmd);
> + if (ret < 0)
> + return ret;
> +
> + /* Ignore decoder command silently in encoder context */
> + if (ctx->mxc_jpeg->mode != MXC_JPEG_DECODE)
> + return 0;

This is wrong, this shouldn't be silent.

I recommend that you use v4l2_disable_ioctl() to disable the VIDIOC_(TRY)_ENCODER_CMD
ioctls for the decoder and the VIDIOC_(TRY)_DECODER_CMD ioctls for the encoder.

That way you can drop this test as well.

And it also fixes a bug where TRY_DECODER_CMD is allowed for an encoder, but not
the DECODER_CMD ioctl. I've improved v4l2-compliance as well since it should have
failed on this.

> +
> + if (cmd->cmd == V4L2_DEC_CMD_STOP) {
> + dev_dbg(dev, "Received V4L2_DEC_CMD_STOP");
> + if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
> + /* No more src bufs, notify app EOS */
> + notify_eos(ctx);
> + } else {
> + /* will send EOS later*/
> + ctx->stopping = 1;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_try_encoder_cmd(struct file *file, void *fh,
> + struct v4l2_encoder_cmd *c)
> +{
> + if (c->cmd != V4L2_ENC_CMD_STOP && c->cmd != V4L2_ENC_CMD_START)
> + return -EINVAL;
> +
> + c->flags = 0;
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_encoder_cmd(struct file *file, void *priv,
> + struct v4l2_encoder_cmd *cmd)
> +{
> + struct v4l2_fh *fh = file->private_data;
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(fh);
> + struct device *dev = ctx->mxc_jpeg->dev;
> + int ret;
> +
> + ret = mxc_jpeg_try_encoder_cmd(file, fh, cmd);
> + if (ret < 0)
> + return ret;
> +
> + /* Ignore encoder command silently in decoder context */
> + if (ctx->mxc_jpeg->mode != MXC_JPEG_ENCODE)
> + return 0;

Same comment as above: drop this test and use v4l2_disable_ioctl()
instead.

> +
> + if (cmd->cmd == V4L2_ENC_CMD_STOP) {
> + dev_dbg(dev, "Received V4L2_ENC_CMD_STOP");
> + if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
> + /* No more src bufs, notify app EOS */
> + notify_eos(ctx);
> + } else {
> + /* will send EOS later*/
> + ctx->stopping = 1;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_queue_setup(struct vb2_queue *q,
> + unsigned int *nbuffers,
> + unsigned int *nplanes,
> + unsigned int sizes[],
> + struct device *alloc_ctxs[])
> +{
> + struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
> + struct mxc_jpeg_q_data *q_data = NULL;
> + int i;
> +
> + q_data = mxc_jpeg_get_q_data(ctx, q->type);
> + if (!q_data)
> + return -EINVAL;
> +
> + /* Handle CREATE_BUFS situation - *nplanes != 0 */
> + if (*nplanes) {
> + for (i = 0; i < *nplanes; i++) {
> + if (sizes[i] < q_data->sizeimage[i])
> + return -EINVAL;
> + }

You need to 'return 0;' here.

Otherwise you will overwrite the sizes array below, that's not
what you want.

> + }
> +
> + /* Handle REQBUFS situation */
> + *nplanes = q_data->fmt->colplanes;
> + for (i = 0; i < *nplanes; i++)
> + sizes[i] = q_data->sizeimage[i];
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> + struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
> + struct mxc_jpeg_q_data *q_data = mxc_jpeg_get_q_data(ctx, q->type);
> +
> + dev_dbg(ctx->mxc_jpeg->dev, "Start streaming ctx=%p", ctx);
> + q_data->sequence = 0;
> +
> + return 0;
> +}
> +
> +static void release_active_buffers(struct vb2_queue *q,
> + enum vb2_buffer_state s)
> +{
> + struct vb2_buffer *vb;
> +
> + if (!list_empty(&q->queued_list))
> + list_for_each_entry(vb, &q->queued_list, queued_entry) {
> + if (vb->state == VB2_BUF_STATE_ACTIVE)
> + vb2_buffer_done(vb, s);
> + }

This isn't right since you are touching internal vb2_queue data structures.

See vim2m_stop_streaming() from vim2m.c on how to do this. Minus the
call to v4l2_ctrl_request_complete() since this driver doesn't use requests.

> +}
> +
> +static void mxc_jpeg_stop_streaming(struct vb2_queue *q)
> +{
> + struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
> +
> + dev_dbg(ctx->mxc_jpeg->dev, "Stop streaming ctx=%p", ctx);
> +
> + /* Release all active buffers */
> + release_active_buffers(q, VB2_BUF_STATE_ERROR);

Just fold release_active_buffers() in here since it is a bit pointless to
have that as a separate function.

> +}
> +
> +struct mxc_jpeg_stream {
> + u8 *addr;
> + u32 loc;
> + u32 end;
> +};
> +
> +static int get_byte(struct mxc_jpeg_stream *stream)
> +{
> + int ret;
> +
> + if (stream->loc >= stream->end)
> + return -1;
> + ret = stream->addr[stream->loc];
> + stream->loc++;
> + return ret;
> +}
> +
> +static int get_sof(struct device *dev,
> + struct mxc_jpeg_stream *stream,
> + struct mxc_jpeg_sof *sof)
> +{
> + int i;
> +
> + if (stream->loc + sizeof(struct mxc_jpeg_sof) >= stream->end)
> + return -1;
> + memcpy(sof, &stream->addr[stream->loc], sizeof(struct mxc_jpeg_sof));
> + _bswap16(&sof->length);
> + _bswap16(&sof->height);
> + _bswap16(&sof->width);
> + dev_dbg(dev, "JPEG SOF: precision=%d\n", sof->precision);
> + dev_dbg(dev, "JPEG SOF: height=%d, width=%d\n",
> + sof->height, sof->width);
> + for (i = 0; i < sof->components_no; i++) {
> + dev_dbg(dev, "JPEG SOF: comp_id=%d, H=0x%x, V=0x%x\n",
> + sof->comp[i].id, sof->comp[i].v, sof->comp[i].h);
> + }
> + return 0;
> +}
> +
> +static int mxc_jpeg_valid_comp_id(struct device *dev,
> + struct mxc_jpeg_sof *sof,
> + struct mxc_jpeg_sos *sos)
> +{
> + int valid = 1;
> + int i;
> +
> + /*
> + * there's a limitation in the IP that the component IDs must be
> + * between 0..4, if they are not, let's patch them
> + */
> + for (i = 0; i < sof->components_no; i++)
> + if (sof->comp[i].id > MXC_JPEG_MAX_COMPONENTS) {
> + valid = 0;
> + dev_err(dev, "Component %d has invalid ID: %d",
> + i, sof->comp[i].id);
> + }
> + if (!valid)
> + /* patch all comp IDs if at least one is invalid */
> + for (i = 0; i < sof->components_no; i++) {
> + dev_warn(dev, "Component %d ID patched to: %d",
> + i, i + 1);
> + sof->comp[i].id = i + 1;
> + sos->comp[i].id = i + 1;
> + }
> +
> + return valid;
> +}
> +
> +static enum mxc_jpeg_image_format
> +mxc_jpeg_get_image_format(struct device *dev, const struct mxc_jpeg_sof *sof)
> +{
> + if (sof->components_no == 1) {
> + dev_dbg(dev, "IMAGE_FORMAT is: MXC_JPEG_GRAY\n");
> + return MXC_JPEG_GRAY;
> + }
> + if (sof->components_no == 3) {
> + if (sof->comp[0].h == 2 && sof->comp[0].v == 2 &&
> + sof->comp[1].h == 1 && sof->comp[1].v == 1 &&
> + sof->comp[2].h == 1 && sof->comp[2].v == 1){
> + dev_dbg(dev, "IMAGE_FORMAT is: MXC_JPEG_YUV420\n");
> + return MXC_JPEG_YUV420;
> + }
> + if (sof->comp[0].h == 2 && sof->comp[0].v == 1 &&
> + sof->comp[1].h == 1 && sof->comp[1].v == 1 &&
> + sof->comp[2].h == 1 && sof->comp[2].v == 1){
> + dev_dbg(dev, "IMAGE_FORMAT is: MXC_JPEG_YUV422\n");
> + return MXC_JPEG_YUV422;
> + }
> + if (sof->comp[0].h == 1 && sof->comp[0].v == 1 &&
> + sof->comp[1].h == 1 && sof->comp[1].v == 1 &&
> + sof->comp[2].h == 1 && sof->comp[2].v == 1){
> + dev_dbg(dev, "IMAGE_FORMAT is: MXC_JPEG_YUV444\n");
> + return MXC_JPEG_YUV444;
> + }
> + }
> + if (sof->components_no == 4) {
> + if (sof->comp[0].h == 1 && sof->comp[0].v == 1 &&
> + sof->comp[1].h == 1 && sof->comp[1].v == 1 &&
> + sof->comp[2].h == 1 && sof->comp[2].v == 1 &&
> + sof->comp[3].h == 1 && sof->comp[3].v == 1){
> + /* this is not tested */
> + dev_dbg(dev, "IMAGE_FORMAT is: MXC_JPEG_ARGB\n");
> + return MXC_JPEG_ARGB;
> + }
> + }
> + dev_err(dev, "Could not identify image format\n");
> + return MXC_JPEG_INVALID;
> +}
> +
> +static void mxc_jpeg_bytesperline(struct mxc_jpeg_q_data *q,
> + u32 precision)
> +{
> + /* Bytes distance between the leftmost pixels in two adjacent lines */
> + if (q->fmt->fourcc == V4L2_PIX_FMT_JPEG) {
> + /* bytesperline unused for compressed formats */
> + q->bytesperline[0] = 0;
> + q->bytesperline[1] = 0;
> + } else if (q->fmt->fourcc == V4L2_PIX_FMT_NV12) {
> + /* When the image format is planar the bytesperline value
> + * applies to the first plane and is divided by the same factor
> + * as the width field for the other planes
> + */
> + q->bytesperline[0] = q->w * (precision / 8) *
> + (q->fmt->depth / 8);
> + q->bytesperline[1] = q->bytesperline[0];
> + } else {
> + /* single plane formats */
> + q->bytesperline[0] = q->w * (precision / 8) *
> + (q->fmt->depth / 8);
> + q->bytesperline[1] = 0;
> + }
> +}
> +
> +static void mxc_jpeg_sizeimage(struct mxc_jpeg_q_data *q)
> +{
> + if (q->fmt->fourcc == V4L2_PIX_FMT_JPEG) {
> + /* if no sizeimage from user, assume worst jpeg compression */
> + if (!q->sizeimage[0])
> + q->sizeimage[0] = 6 * q->w * q->h;
> + q->sizeimage[1] = 0;
> +
> + if (q->sizeimage[0] > MXC_JPEG_MAX_SIZEIMAGE)
> + q->sizeimage[0] = MXC_JPEG_MAX_SIZEIMAGE;
> +
> + /* jpeg stream size must be multiple of 1K */
> + q->sizeimage[0] = ALIGN(q->sizeimage[0], 1024);
> + } else {
> + q->sizeimage[0] = q->bytesperline[0] * q->h;
> + q->sizeimage[1] = 0;
> + if (q->fmt->fourcc == V4L2_PIX_FMT_NV12)
> + q->sizeimage[1] = q->sizeimage[0] / 2;
> + }
> +}
> +
> +static int mxc_jpeg_parse(struct mxc_jpeg_ctx *ctx,
> + u8 *src_addr, u32 size, bool *dht_needed)
> +{
> + struct device *dev = ctx->mxc_jpeg->dev;
> + struct mxc_jpeg_q_data *q_data_out, *q_data_cap;
> + enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + struct mxc_jpeg_stream stream;
> + bool notfound = true;
> + bool app14 = false;
> + bool src_chg = false;
> + u8 app14_transform = 0;
> + struct mxc_jpeg_sof sof, *psof = NULL;
> + struct mxc_jpeg_sos *psos = NULL;
> + int byte;
> + u8 *next = NULL;
> + enum mxc_jpeg_image_format img_fmt;
> + u32 fourcc;
> +
> + memset(&sof, 0, sizeof(struct mxc_jpeg_sof));
> + stream.addr = src_addr;
> + stream.end = size;
> + stream.loc = 0;
> + *dht_needed = true;
> +
> + /* check stream starts with SOI */
> + byte = get_byte(&stream);
> + if (byte == -1 || byte != 0xFF)
> + return -EINVAL;
> + byte = get_byte(&stream);
> + if (byte == -1 || byte != 0xD8)
> + return -EINVAL;
> +
> + while (notfound) {
> + byte = get_byte(&stream);
> + if (byte == -1)
> + return -EINVAL;
> + if (byte != 0xff)
> + continue;
> + do {
> + byte = get_byte(&stream);
> + } while (byte == 0xff);
> + if (byte == -1)
> + return false;
> + if (byte == 0)
> + continue;
> + switch (byte) {
> + case DHT:
> + /* DHT marker present, no need to inject default one */
> + *dht_needed = false;
> + break;
> + case SOF2: /* Progressive DCF frame definition */
> + dev_err(dev,
> + "Progressive JPEG not supported by hardware");
> + return -EINVAL;
> + case SOF1: /* Extended sequential DCF frame definition */
> + case SOF0: /* Baseline sequential DCF frame definition */
> + if (get_sof(dev, &stream, &sof) == -1)
> + break;
> + next = stream.addr + stream.loc;
> + psof = (struct mxc_jpeg_sof *)next;
> + break;
> + case SOS:
> + next = stream.addr + stream.loc;
> + psos = (struct mxc_jpeg_sos *)next;
> + notfound = false;
> + break;
> + case APP14:
> + app14 = true;
> + /*
> + * Application Data Syntax is:
> + * 2 bytes(APPn:0xFF,0xEE), 2 bytes(Lp), Ap1...ApLp-2
> + * The transform flag is in Ap12
> + * stream.loc is now on APPn-0xEE byte
> + */
> + app14_transform = *(stream.addr + stream.loc + 12 + 1);
> + break;
> + default:
> + notfound = true;
> + }
> + }
> + q_data_out = mxc_jpeg_get_q_data(ctx,
> + V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
> + if (q_data_out->w == 0 && q_data_out->h == 0) {
> + dev_warn(dev, "Invalid user resolution 0x0");
> + dev_warn(dev, "Keeping resolution from JPEG: %dx%d",
> + sof.width, sof.height);
> + q_data_out->w = sof.width;
> + q_data_out->h = sof.height;
> + } else if (sof.width != q_data_out->w || sof.height != q_data_out->h) {
> + dev_err(dev,
> + "Resolution mismatch: %dx%d (JPEG) versus %dx%d(user)",
> + sof.width, sof.height, q_data_out->w, q_data_out->h);
> + return -EINVAL;
> + }
> + if (sof.width % 8 != 0 || sof.height % 8 != 0) {
> + dev_err(dev, "JPEG width or height not multiple of 8: %dx%d\n",
> + sof.width, sof.height);
> + return -EINVAL;
> + }
> + if (sof.width > MXC_JPEG_MAX_WIDTH ||
> + sof.height > MXC_JPEG_MAX_HEIGHT) {
> + dev_err(dev, "JPEG width or height should be <= 8192: %dx%d\n",
> + sof.width, sof.height);
> + return -EINVAL;
> + }
> + if (sof.width < MXC_JPEG_MIN_WIDTH ||
> + sof.height < MXC_JPEG_MIN_HEIGHT) {
> + dev_err(dev, "JPEG width or height should be > 64: %dx%d\n",
> + sof.width, sof.height);
> + return -EINVAL;
> + }
> + if (sof.components_no > MXC_JPEG_MAX_COMPONENTS) {
> + dev_err(dev, "JPEG number of components should be <=%d",
> + MXC_JPEG_MAX_COMPONENTS);
> + return -EINVAL;
> + }
> + /* check and, if necessary, patch component IDs*/
> + if (!mxc_jpeg_valid_comp_id(dev, psof, psos))
> + dev_warn(dev, "JPEG component ids should be 0-3 or 1-4");
> +
> + img_fmt = mxc_jpeg_get_image_format(dev, &sof);
> + if (img_fmt == MXC_JPEG_INVALID)
> + return -EINVAL;
> +
> + /*
> + * If the transform flag from APP14 marker is 0, images that are
> + * encoded with 3 components have RGB colorspace, see Recommendation
> + * ITU-T T.872 chapter 6.5.3 APP14 marker segment for colour encoding
> + */
> + if (img_fmt == MXC_JPEG_YUV444 && app14 && app14_transform == 0)
> + img_fmt = MXC_JPEG_RGB;
> +
> + if (mxc_jpeg_imgfmt_to_fourcc(img_fmt, &fourcc)) {
> + dev_err(dev, "Fourcc not found for %d", img_fmt);
> + return -EINVAL;
> + }
> +
> + /*
> + * set-up the capture queue with the pixelformat and resolution
> + * detected from the jpeg output stream
> + */
> + q_data_cap = mxc_jpeg_get_q_data(ctx, cap_type);
> + if (q_data_cap->w != sof.width || q_data_cap->h != sof.height)
> + src_chg = true;
> + q_data_cap->w = sof.width;
> + q_data_cap->h = sof.height;
> + q_data_cap->fmt = mxc_jpeg_find_format(ctx, fourcc);
> + q_data_cap->w_adjusted = q_data_cap->w;
> + q_data_cap->h_adjusted = q_data_cap->h;
> + /*
> + * align up the resolution for CAST IP,
> + * but leave the buffer resolution unchanged
> + */
> + v4l_bound_align_image(&q_data_cap->w_adjusted,
> + q_data_cap->w_adjusted, /* adjust up */
> + MXC_JPEG_MAX_WIDTH,
> + q_data_cap->fmt->h_align,
> + &q_data_cap->h_adjusted,
> + q_data_cap->h_adjusted, /* adjust up */
> + MXC_JPEG_MAX_HEIGHT,
> + q_data_cap->fmt->v_align,
> + 0);
> + dev_dbg(dev, "Detected jpeg res=(%dx%d)->(%dx%d), pixfmt=%c%c%c%c\n",
> + q_data_cap->w, q_data_cap->h,
> + q_data_cap->w_adjusted, q_data_cap->h_adjusted,
> + (fourcc & 0xff),
> + (fourcc >> 8) & 0xff,
> + (fourcc >> 16) & 0xff,
> + (fourcc >> 24) & 0xff);
> +
> + /* setup bytesperline/sizeimage for capture queue */
> + mxc_jpeg_bytesperline(q_data_cap, sof.precision);
> + mxc_jpeg_sizeimage(q_data_cap);
> +
> + /*
> + * if the CAPTURE format was updated with new values, regardless of
> + * whether they match the values set by the client or not, signal
> + * a source change event
> + */
> + if (src_chg)
> + notify_src_chg(ctx);
> +
> + return 0;
> +}
> +
> +static void mxc_jpeg_buf_queue(struct vb2_buffer *vb)
> +{
> + int ret;
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> + struct mxc_jpeg_src_buf *jpeg_src_buf;
> +
> + if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> + goto end;
> +
> + /* for V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE */
> + if (ctx->mxc_jpeg->mode != MXC_JPEG_DECODE)
> + goto end;
> +
> + jpeg_src_buf = vb2_to_mxc_buf(vb);
> + jpeg_src_buf->jpeg_parse_error = false;
> + ret = mxc_jpeg_parse(ctx,
> + (u8 *)vb2_plane_vaddr(vb, 0),
> + vb2_get_plane_payload(vb, 0),
> + &jpeg_src_buf->dht_needed);
> + if (ret)
> + jpeg_src_buf->jpeg_parse_error = true;
> +
> +end:
> + v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
> +}
> +
> +static int mxc_jpeg_buf_out_validate(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +
> + if (vbuf->field == V4L2_FIELD_ANY)

Drop this 'if'

> + vbuf->field = V4L2_FIELD_NONE;

and always set this to V4L2_FIELD_NONE.

> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_buf_prepare(struct vb2_buffer *vb)
> +{
> + struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> + struct mxc_jpeg_q_data *q_data = NULL;
> + struct device *dev = ctx->mxc_jpeg->dev;
> + unsigned long sizeimage;
> + int i;
> +
> + q_data = mxc_jpeg_get_q_data(ctx, vb->vb2_queue->type);
> + if (!q_data)
> + return -EINVAL;
> + for (i = 0; i < q_data->fmt->colplanes; i++) {
> + sizeimage = q_data->sizeimage[i];
> + if (vb2_plane_size(vb, i) < sizeimage) {
> + dev_err(dev, "plane %d too small (%lu < %lu)",
> + i, vb2_plane_size(vb, i), sizeimage);
> + return -EINVAL;
> + }
> + vb2_set_plane_payload(vb, i, sizeimage);
> + }
> + return 0;
> +}
> +
> +static const struct vb2_ops mxc_jpeg_qops = {
> + .queue_setup = mxc_jpeg_queue_setup,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .buf_out_validate = mxc_jpeg_buf_out_validate,
> + .buf_prepare = mxc_jpeg_buf_prepare,
> + .start_streaming = mxc_jpeg_start_streaming,
> + .stop_streaming = mxc_jpeg_stop_streaming,
> + .buf_queue = mxc_jpeg_buf_queue,
> +};
> +
> +static int mxc_jpeg_queue_init(void *priv, struct vb2_queue *src_vq,
> + struct vb2_queue *dst_vq)
> +{
> + struct mxc_jpeg_ctx *ctx = priv;
> + int ret;
> +
> + src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> + src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> + src_vq->drv_priv = ctx;
> + src_vq->buf_struct_size = sizeof(struct mxc_jpeg_src_buf);
> + src_vq->ops = &mxc_jpeg_qops;
> + src_vq->mem_ops = &vb2_dma_contig_memops;
> + src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> + src_vq->lock = &ctx->mxc_jpeg->lock;
> + src_vq->dev = ctx->mxc_jpeg->dev;
> + src_vq->allow_zero_bytesused = 1; /* keep old userspace apps working */
> +
> + ret = vb2_queue_init(src_vq);
> + if (ret)
> + return ret;
> +
> + dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> + dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> + dst_vq->drv_priv = ctx;
> + dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> + dst_vq->ops = &mxc_jpeg_qops;
> + dst_vq->mem_ops = &vb2_dma_contig_memops;
> + dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> + dst_vq->lock = &ctx->mxc_jpeg->lock;
> + dst_vq->dev = ctx->mxc_jpeg->dev;
> +
> + ret = vb2_queue_init(dst_vq);
> + return ret;
> +}
> +
> +static void mxc_jpeg_set_default_params(struct mxc_jpeg_ctx *ctx)
> +{
> + struct mxc_jpeg_q_data *out_q = &ctx->out_q;
> + struct mxc_jpeg_q_data *cap_q = &ctx->cap_q;
> + struct mxc_jpeg_q_data *q[2] = {out_q, cap_q};
> + int i;
> +
> + if (ctx->mxc_jpeg->mode == MXC_JPEG_ENCODE) {
> + out_q->fmt = mxc_jpeg_find_format(ctx, MXC_JPEG_DEFAULT_PFMT);
> + cap_q->fmt = mxc_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG);
> + } else {
> + out_q->fmt = mxc_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG);
> + cap_q->fmt = mxc_jpeg_find_format(ctx, MXC_JPEG_DEFAULT_PFMT);
> + }
> +
> + for (i = 0; i < 2; i++) {
> + q[i]->w = MXC_JPEG_DEFAULT_WIDTH;
> + q[i]->h = MXC_JPEG_DEFAULT_HEIGHT;
> + q[i]->w_adjusted = MXC_JPEG_DEFAULT_WIDTH;
> + q[i]->h_adjusted = MXC_JPEG_DEFAULT_HEIGHT;
> + mxc_jpeg_bytesperline(q[i], 8);
> + mxc_jpeg_sizeimage(q[i]);
> + }
> +}
> +
> +static int mxc_jpeg_open(struct file *file)
> +{
> + struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
> + struct video_device *mxc_vfd = video_devdata(file);
> + struct device *dev = mxc_jpeg->dev;
> + struct mxc_jpeg_ctx *ctx;
> + int ret = 0;
> +
> + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + if (mutex_lock_interruptible(&mxc_jpeg->lock)) {
> + ret = -ERESTARTSYS;
> + goto free;
> + }
> +
> + v4l2_fh_init(&ctx->fh, mxc_vfd);
> + file->private_data = &ctx->fh;
> + v4l2_fh_add(&ctx->fh);
> +
> + ctx->mxc_jpeg = mxc_jpeg;
> +
> + ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(mxc_jpeg->m2m_dev, ctx,
> + mxc_jpeg_queue_init);
> +
> + if (IS_ERR(ctx->fh.m2m_ctx)) {
> + ret = PTR_ERR(ctx->fh.m2m_ctx);
> + goto error;
> + }
> +
> + mxc_jpeg_set_default_params(ctx);
> + ctx->slot = MXC_MAX_SLOTS; /* slot not allocated yet */
> +
> + if (mxc_jpeg->mode == MXC_JPEG_DECODE)
> + dev_dbg(dev, "Opened JPEG decoder instance %p\n", ctx);
> + else
> + dev_dbg(dev, "Opened JPEG encoder instance %p\n", ctx);
> + mutex_unlock(&mxc_jpeg->lock);
> +
> + return 0;
> +
> +error:
> + v4l2_fh_del(&ctx->fh);
> + v4l2_fh_exit(&ctx->fh);
> + mutex_unlock(&mxc_jpeg->lock);
> +free:
> + kfree(ctx);
> + return ret;
> +}
> +
> +static int mxc_jpeg_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
> +
> + strscpy(cap->driver, MXC_JPEG_NAME " decoder", sizeof(cap->driver));
> + strscpy(cap->card, MXC_JPEG_NAME " decoder", sizeof(cap->card));

For the two lines above: decoder -> codec

Since this driver is used for both encoder and decoder, so it is odd to
see 'decoder' for video1 as well. Just name it 'codec'.

> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + dev_name(mxc_jpeg->dev));
> + cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
> + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> +
> + if (ctx->mxc_jpeg->mode == MXC_JPEG_ENCODE)
> + return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
> + MXC_JPEG_FMT_TYPE_ENC);
> + else
> + return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
> + MXC_JPEG_FMT_TYPE_RAW);
> +}
> +
> +static int mxc_jpeg_enum_fmt_vid_out(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> +
> + if (ctx->mxc_jpeg->mode == MXC_JPEG_DECODE)
> + return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
> + MXC_JPEG_FMT_TYPE_ENC);
> + else
> + return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
> + MXC_JPEG_FMT_TYPE_RAW);
> +}
> +
> +static int mxc_jpeg_try_fmt(struct v4l2_format *f, struct mxc_jpeg_fmt *fmt,
> + struct mxc_jpeg_ctx *ctx, int q_type)
> +{
> + struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> + struct v4l2_plane_pix_format *pfmt;
> + u32 w = (pix_mp->width < MXC_JPEG_MAX_WIDTH) ?
> + pix_mp->width : MXC_JPEG_MAX_WIDTH;
> + u32 h = (pix_mp->height < MXC_JPEG_MAX_HEIGHT) ?
> + pix_mp->height : MXC_JPEG_MAX_HEIGHT;
> + int i;
> + struct mxc_jpeg_q_data tmp_q;
> +
> + memset(pix_mp->reserved, 0, sizeof(pix_mp->reserved));
> + pix_mp->field = V4L2_FIELD_NONE;
> + pix_mp->num_planes = fmt->colplanes;
> + pix_mp->pixelformat = fmt->fourcc;
> +
> + /*
> + * use MXC_JPEG_H_ALIGN instead of fmt->v_align, for vertical
> + * alignment, to loosen up the alignment to multiple of 8,
> + * otherwise NV12-1080p fails as 1080 is not a multiple of 16
> + */
> + v4l_bound_align_image(&w,
> + MXC_JPEG_MIN_WIDTH,
> + w, /* adjust downwards*/
> + fmt->h_align,
> + &h,
> + MXC_JPEG_MIN_HEIGHT,
> + h, /* adjust downwards*/
> + MXC_JPEG_H_ALIGN,
> + 0);
> + pix_mp->width = w; /* negotiate the width */
> + pix_mp->height = h; /* negotiate the height */
> +
> + /* get user input into the tmp_q */
> + tmp_q.w = w;
> + tmp_q.h = h;
> + tmp_q.fmt = fmt;
> + for (i = 0; i < pix_mp->num_planes; i++) {
> + pfmt = &pix_mp->plane_fmt[i];
> + tmp_q.bytesperline[i] = pfmt->bytesperline;
> + tmp_q.sizeimage[i] = pfmt->sizeimage;
> + }
> +
> + /* calculate bytesperline & sizeimage into the tmp_q */
> + mxc_jpeg_bytesperline(&tmp_q, 8);
> + mxc_jpeg_sizeimage(&tmp_q);
> +
> + /* adjust user format according to our calculations */
> + for (i = 0; i < pix_mp->num_planes; i++) {
> + pfmt = &pix_mp->plane_fmt[i];
> + memset(pfmt->reserved, 0, sizeof(pfmt->reserved));
> + pfmt->bytesperline = tmp_q.bytesperline[i];
> + pfmt->sizeimage = tmp_q.sizeimage[i];
> + }
> +
> + /* fix colorspace information to sRGB for both output & capture */
> + pix_mp->colorspace = V4L2_COLORSPACE_SRGB;
> + pix_mp->ycbcr_enc = V4L2_YCBCR_ENC_601;
> + pix_mp->xfer_func = V4L2_XFER_FUNC_SRGB;
> + pix_mp->quantization = V4L2_QUANTIZATION_FULL_RANGE;

So YUV formats are expected to be full range as well? Both when encoding
and decoding?

> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + struct device *dev = jpeg->dev;
> + struct mxc_jpeg_fmt *fmt;
> + u32 fourcc = f->fmt.pix_mp.pixelformat;
> +
> + int q_type = (jpeg->mode == MXC_JPEG_DECODE) ?
> + MXC_JPEG_FMT_TYPE_RAW : MXC_JPEG_FMT_TYPE_ENC;
> +
> + if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
> + dev_err(dev, "TRY_FMT with Invalid type: %d\n", f->type);
> + return -EINVAL;
> + }
> +
> + fmt = mxc_jpeg_find_format(ctx, fourcc);
> + if (!fmt || fmt->flags != q_type) {
> + dev_warn(dev, "Format not supported: %c%c%c%c, use the default.\n",
> + (fourcc & 0xff),
> + (fourcc >> 8) & 0xff,
> + (fourcc >> 16) & 0xff,
> + (fourcc >> 24) & 0xff);
> + f->fmt.pix_mp.pixelformat = (jpeg->mode == MXC_JPEG_DECODE) ?
> + MXC_JPEG_DEFAULT_PFMT : V4L2_PIX_FMT_JPEG;
> + fmt = mxc_jpeg_find_format(ctx, f->fmt.pix_mp.pixelformat);
> + }
> + return mxc_jpeg_try_fmt(f, fmt, ctx, q_type);
> +}
> +
> +static int mxc_jpeg_try_fmt_vid_out(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + struct device *dev = jpeg->dev;
> + struct mxc_jpeg_fmt *fmt;
> + u32 fourcc = f->fmt.pix_mp.pixelformat;
> +
> + int q_type = (jpeg->mode == MXC_JPEG_ENCODE) ?
> + MXC_JPEG_FMT_TYPE_RAW : MXC_JPEG_FMT_TYPE_ENC;
> +
> + if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
> + dev_err(dev, "TRY_FMT with Invalid type: %d\n", f->type);
> + return -EINVAL;
> + }
> +
> + fmt = mxc_jpeg_find_format(ctx, fourcc);
> + if (!fmt || fmt->flags != q_type) {
> + dev_warn(dev, "Format not supported: %c%c%c%c, use the default.\n",
> + (fourcc & 0xff),
> + (fourcc >> 8) & 0xff,
> + (fourcc >> 16) & 0xff,
> + (fourcc >> 24) & 0xff);
> + f->fmt.pix_mp.pixelformat = (jpeg->mode == MXC_JPEG_ENCODE) ?
> + MXC_JPEG_DEFAULT_PFMT : V4L2_PIX_FMT_JPEG;
> + fmt = mxc_jpeg_find_format(ctx, f->fmt.pix_mp.pixelformat);
> + }
> + return mxc_jpeg_try_fmt(f, fmt, ctx, q_type);
> +}
> +
> +static int mxc_jpeg_s_fmt(struct mxc_jpeg_ctx *ctx,
> + struct v4l2_format *f)
> +{
> + struct vb2_queue *vq;
> + struct mxc_jpeg_q_data *q_data = NULL;
> + struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + int i;
> +
> + vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
> + if (!vq)
> + return -EINVAL;
> +
> + q_data = mxc_jpeg_get_q_data(ctx, f->type);
> +
> + if (vb2_is_busy(vq)) {
> + v4l2_err(&jpeg->v4l2_dev, "queue busy\n");
> + return -EBUSY;
> + }
> +
> + q_data->fmt = mxc_jpeg_find_format(ctx, pix_mp->pixelformat);
> + q_data->w = pix_mp->width;
> + q_data->h = pix_mp->height;
> +
> + q_data->w_adjusted = q_data->w;
> + q_data->h_adjusted = q_data->h;
> + if (jpeg->mode == MXC_JPEG_DECODE) {
> + /*
> + * align up the resolution for CAST IP,
> + * but leave the buffer resolution unchanged
> + */
> + v4l_bound_align_image(&q_data->w_adjusted,
> + q_data->w_adjusted, /* adjust upwards */
> + MXC_JPEG_MAX_WIDTH,
> + q_data->fmt->h_align,
> + &q_data->h_adjusted,
> + q_data->h_adjusted, /* adjust upwards */
> + MXC_JPEG_MAX_HEIGHT,
> + q_data->fmt->v_align,
> + 0);
> + } else {
> + /*
> + * align down the resolution for CAST IP,
> + * but leave the buffer resolution unchanged
> + */
> + v4l_bound_align_image(&q_data->w_adjusted,
> + MXC_JPEG_MIN_WIDTH,
> + q_data->w_adjusted, /* adjust downwards*/
> + q_data->fmt->h_align,
> + &q_data->h_adjusted,
> + MXC_JPEG_MIN_HEIGHT,
> + q_data->h_adjusted, /* adjust downwards*/
> + q_data->fmt->v_align,
> + 0);
> + }
> +
> + for (i = 0; i < pix_mp->num_planes; i++) {
> + q_data->bytesperline[i] = pix_mp->plane_fmt[i].bytesperline;
> + q_data->sizeimage[i] = pix_mp->plane_fmt[i].sizeimage;
> + }
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + int ret;
> +
> + ret = mxc_jpeg_try_fmt_vid_cap(file, priv, f);
> + if (ret)
> + return ret;
> +
> + return mxc_jpeg_s_fmt(mxc_jpeg_fh_to_ctx(priv), f);
> +}
> +
> +static int mxc_jpeg_s_fmt_vid_out(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + int ret;
> +
> + ret = mxc_jpeg_try_fmt_vid_out(file, priv, f);
> + if (ret)
> + return ret;
> +
> + return mxc_jpeg_s_fmt(mxc_jpeg_fh_to_ctx(priv), f);
> +}
> +
> +static int mxc_jpeg_g_fmt_vid(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> + struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
> + struct device *dev = jpeg->dev;
> + struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> + struct mxc_jpeg_q_data *q_data = mxc_jpeg_get_q_data(ctx, f->type);
> + int i;
> +
> + if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
> + dev_err(dev, "G_FMT with Invalid type: %d\n", f->type);
> + return -EINVAL;
> + }
> +
> + pix_mp->pixelformat = q_data->fmt->fourcc;
> + pix_mp->width = q_data->w;
> + pix_mp->height = q_data->h;
> + pix_mp->field = V4L2_FIELD_NONE;
> +
> + /* fix colorspace information to sRGB for both output & capture */
> + pix_mp->colorspace = V4L2_COLORSPACE_SRGB;
> + pix_mp->ycbcr_enc = V4L2_YCBCR_ENC_601;
> + pix_mp->xfer_func = V4L2_XFER_FUNC_SRGB;
> + pix_mp->quantization = V4L2_QUANTIZATION_FULL_RANGE;
> +
> + pix_mp->num_planes = q_data->fmt->colplanes;
> + for (i = 0; i < pix_mp->num_planes; i++) {
> + pix_mp->plane_fmt[i].bytesperline = q_data->bytesperline[i];
> + pix_mp->plane_fmt[i].sizeimage = q_data->sizeimage[i];
> + }
> +
> + return 0;
> +}
> +
> +static int mxc_jpeg_subscribe_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + switch (sub->type) {
> + case V4L2_EVENT_EOS:
> + return v4l2_event_subscribe(fh, sub, 0, NULL);
> + case V4L2_EVENT_SOURCE_CHANGE:
> + return v4l2_src_change_event_subscribe(fh, sub);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int mxc_jpeg_qbuf(struct file *file, void *priv,
> + struct v4l2_buffer *buf)
> +{
> + struct v4l2_fh *fh = file->private_data;
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> + struct device *dev = ctx->mxc_jpeg->dev;
> + struct vb2_queue *vq;
> +
> + dev_dbg(dev, "QBUF type=%d, index=%d", buf->type, buf->index);
> + vq = v4l2_m2m_get_vq(fh->m2m_ctx, buf->type);
> + if (buf->index >= vq->num_buffers) {

Why this test? There should be no need for this function,
v4l2_m2m_ioctl_qbuf() should do the right thing here.

> + dev_err(dev, "buffer index out of range\n");
> + return -EINVAL;
> + }
> +
> + return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf);
> +}
> +
> +static int mxc_jpeg_dqbuf(struct file *file, void *priv,
> + struct v4l2_buffer *buf)
> +{
> + struct v4l2_fh *fh = file->private_data;
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
> + struct device *dev = ctx->mxc_jpeg->dev;
> + int num_src_ready = v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx);
> + int ret;
> +
> + dev_dbg(dev, "DQBUF type=%d, index=%d", buf->type, buf->index);
> + if (ctx->stopping == 1 && num_src_ready == 0) {
> + /* No more src bufs, notify app EOS */
> + notify_eos(ctx);
> + ctx->stopping = 0;
> + }
> +
> + ret = v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
> + buf->field = V4L2_FIELD_NONE;

This line belongs in mxc_jpeg_buf_prepare().

> +
> + return ret;
> +}
> +
> +static const struct v4l2_ioctl_ops mxc_jpeg_ioctl_ops = {
> + .vidioc_querycap = mxc_jpeg_querycap,
> + .vidioc_enum_fmt_vid_cap = mxc_jpeg_enum_fmt_vid_cap,
> + .vidioc_enum_fmt_vid_out = mxc_jpeg_enum_fmt_vid_out,
> +
> + .vidioc_try_fmt_vid_cap_mplane = mxc_jpeg_try_fmt_vid_cap,
> + .vidioc_try_fmt_vid_out_mplane = mxc_jpeg_try_fmt_vid_out,
> +
> + .vidioc_s_fmt_vid_cap_mplane = mxc_jpeg_s_fmt_vid_cap,
> + .vidioc_s_fmt_vid_out_mplane = mxc_jpeg_s_fmt_vid_out,
> +
> + .vidioc_g_fmt_vid_cap_mplane = mxc_jpeg_g_fmt_vid,
> + .vidioc_g_fmt_vid_out_mplane = mxc_jpeg_g_fmt_vid,
> +
> + .vidioc_subscribe_event = mxc_jpeg_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +
> + .vidioc_try_decoder_cmd = mxc_jpeg_try_decoder_cmd,

This can be replaced by v4l2_m2m_ioctl_try_decoder_cmd

> + .vidioc_decoder_cmd = mxc_jpeg_decoder_cmd,
> + .vidioc_try_encoder_cmd = mxc_jpeg_try_encoder_cmd,

and this by v4l2_m2m_ioctl_try_encoder_cmd.

> + .vidioc_encoder_cmd = mxc_jpeg_encoder_cmd,
> +
> + .vidioc_qbuf = mxc_jpeg_qbuf,
> + .vidioc_dqbuf = mxc_jpeg_dqbuf,
> +
> + .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
> + .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
> + .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
> + .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
> + .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
> + .vidioc_streamon = v4l2_m2m_ioctl_streamon,
> + .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
> +};
> +
> +static int mxc_jpeg_release(struct file *file)
> +{
> + struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
> + struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(file->private_data);
> + struct device *dev = mxc_jpeg->dev;
> +
> + mutex_lock(&mxc_jpeg->lock);
> + if (mxc_jpeg->mode == MXC_JPEG_DECODE)
> + dev_dbg(dev, "Release JPEG decoder instance on slot %d.",
> + ctx->slot);
> + else
> + dev_dbg(dev, "Release JPEG encoder instance on slot %d.",
> + ctx->slot);
> + v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
> + v4l2_fh_del(&ctx->fh);
> + v4l2_fh_exit(&ctx->fh);
> + kfree(ctx);
> + mutex_unlock(&mxc_jpeg->lock);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_file_operations mxc_jpeg_fops = {
> + .owner = THIS_MODULE,
> + .open = mxc_jpeg_open,
> + .release = mxc_jpeg_release,
> + .poll = v4l2_m2m_fop_poll,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = v4l2_m2m_fop_mmap,
> +};
> +
> +static struct v4l2_m2m_ops mxc_jpeg_m2m_ops = {
> + .device_run = mxc_jpeg_device_run,
> +};
> +
> +static void mxc_jpeg_detach_pm_domains(struct mxc_jpeg_dev *jpeg)
> +{
> + int i;
> +
> + for (i = 0; i < jpeg->num_domains; i++) {
> + if (jpeg->pd_link[i] && !IS_ERR(jpeg->pd_link[i]))
> + device_link_del(jpeg->pd_link[i]);
> + if (jpeg->pd_dev[i] && !IS_ERR(jpeg->pd_dev[i]))
> + dev_pm_domain_detach(jpeg->pd_dev[i], true);
> + jpeg->pd_dev[i] = NULL;
> + jpeg->pd_link[i] = NULL;
> + }
> +}
> +
> +static int mxc_jpeg_attach_pm_domains(struct mxc_jpeg_dev *jpeg)
> +{
> + struct device *dev = jpeg->dev;
> + struct device_node *np = jpeg->pdev->dev.of_node;
> + int i;
> + int ret;
> +
> + jpeg->num_domains = of_count_phandle_with_args(np, "power-domains",
> + "#power-domain-cells");
> + if (jpeg->num_domains < 0) {
> + dev_err(dev, "No power domains defined for jpeg node\n");
> + return jpeg->num_domains;
> + }
> +
> + jpeg->pd_dev = devm_kmalloc_array(dev, jpeg->num_domains,
> + sizeof(*jpeg->pd_dev), GFP_KERNEL);
> + if (!jpeg->pd_dev)
> + return -ENOMEM;
> +
> + jpeg->pd_link = devm_kmalloc_array(dev, jpeg->num_domains,
> + sizeof(*jpeg->pd_link), GFP_KERNEL);
> + if (!jpeg->pd_link)
> + return -ENOMEM;
> +
> + for (i = 0; i < jpeg->num_domains; i++) {
> + jpeg->pd_dev[i] = dev_pm_domain_attach_by_id(dev, i);
> + if (IS_ERR(jpeg->pd_dev[i])) {
> + ret = PTR_ERR(jpeg->pd_dev[i]);
> + goto fail;
> + }
> +
> + jpeg->pd_link[i] = device_link_add(dev, jpeg->pd_dev[i],
> + DL_FLAG_STATELESS |
> + DL_FLAG_PM_RUNTIME |
> + DL_FLAG_RPM_ACTIVE);
> + if (IS_ERR(jpeg->pd_link[i])) {
> + ret = PTR_ERR(jpeg->pd_link[i]);
> + goto fail;
> + }
> + }
> +
> + return 0;
> +fail:
> + mxc_jpeg_detach_pm_domains(jpeg);
> + return ret;
> +}
> +
> +static int mxc_jpeg_probe(struct platform_device *pdev)
> +{
> + struct mxc_jpeg_dev *jpeg;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + int dec_irq;
> + int ret;
> + int mode;
> + const struct of_device_id *of_id;
> + unsigned int slot;
> +
> + of_id = of_match_node(mxc_jpeg_match, dev->of_node);
> + mode = (int)(u64)of_id->data;
> +
> + jpeg = devm_kzalloc(dev, sizeof(struct mxc_jpeg_dev), GFP_KERNEL);
> + if (!jpeg)
> + return -ENOMEM;
> +
> + mutex_init(&jpeg->lock);
> + spin_lock_init(&jpeg->hw_lock);
> +
> + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (ret) {
> + dev_err(&pdev->dev, "No suitable DMA available.\n");
> + goto err_irq;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + jpeg->base_reg = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(jpeg->base_reg))
> + return PTR_ERR(jpeg->base_reg);
> +
> + for (slot = 0; slot < MXC_MAX_SLOTS; slot++) {
> + dec_irq = platform_get_irq(pdev, slot);
> + if (dec_irq < 0) {
> + dev_err(&pdev->dev, "Failed to get irq %d\n", dec_irq);
> + ret = dec_irq;
> + goto err_irq;
> + }
> + ret = devm_request_irq(&pdev->dev, dec_irq, mxc_jpeg_dec_irq,
> + 0, pdev->name, jpeg);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to request irq %d (%d)\n",
> + dec_irq, ret);
> + goto err_irq;
> + }
> + }
> +
> + jpeg->pdev = pdev;
> + jpeg->dev = dev;
> + jpeg->mode = mode;
> +
> + ret = mxc_jpeg_attach_pm_domains(jpeg);
> + if (ret < 0) {
> + dev_err(dev, "failed to attach power domains %d\n", ret);
> + return ret;
> + }
> +
> + /* v4l2 */
> + ret = v4l2_device_register(dev, &jpeg->v4l2_dev);
> + if (ret) {
> + dev_err(dev, "failed to register v4l2 device\n");
> + goto err_register;
> + }
> + jpeg->m2m_dev = v4l2_m2m_init(&mxc_jpeg_m2m_ops);
> + if (IS_ERR(jpeg->m2m_dev)) {
> + dev_err(dev, "failed to register v4l2 device\n");
> + goto err_m2m;
> + }
> +
> + jpeg->dec_vdev = video_device_alloc();
> + if (!jpeg->dec_vdev) {
> + dev_err(dev, "failed to register v4l2 device\n");
> + goto err_vdev_alloc;
> + }
> + if (mode == MXC_JPEG_ENCODE)
> + snprintf(jpeg->dec_vdev->name,
> + sizeof(jpeg->dec_vdev->name),
> + "%s-enc", MXC_JPEG_NAME);
> + else
> + snprintf(jpeg->dec_vdev->name,
> + sizeof(jpeg->dec_vdev->name),
> + "%s-dec", MXC_JPEG_NAME);
> +
> + jpeg->dec_vdev->fops = &mxc_jpeg_fops;
> + jpeg->dec_vdev->ioctl_ops = &mxc_jpeg_ioctl_ops;
> + jpeg->dec_vdev->minor = -1;
> + jpeg->dec_vdev->release = video_device_release;
> + jpeg->dec_vdev->lock = &jpeg->lock; /* lock for ioctl serialization */
> + jpeg->dec_vdev->v4l2_dev = &jpeg->v4l2_dev;
> + jpeg->dec_vdev->vfl_dir = VFL_DIR_M2M;
> + jpeg->dec_vdev->device_caps = V4L2_CAP_STREAMING |
> + V4L2_CAP_VIDEO_M2M_MPLANE;
> +
> + ret = video_register_device(jpeg->dec_vdev, VFL_TYPE_VIDEO, -1);
> + if (ret) {
> + dev_err(dev, "failed to register video device\n");
> + goto err_vdev_register;
> + }
> + video_set_drvdata(jpeg->dec_vdev, jpeg);
> + if (mode == MXC_JPEG_ENCODE)
> + v4l2_info(&jpeg->v4l2_dev,
> + "encoder device registered as /dev/video%d (%d,%d)\n",
> + jpeg->dec_vdev->num, VIDEO_MAJOR,
> + jpeg->dec_vdev->minor);
> + else
> + v4l2_info(&jpeg->v4l2_dev,
> + "decoder device registered as /dev/video%d (%d,%d)\n",
> + jpeg->dec_vdev->num, VIDEO_MAJOR,
> + jpeg->dec_vdev->minor);
> +
> + platform_set_drvdata(pdev, jpeg);
> +
> + return 0;
> +
> +err_vdev_register:
> + video_device_release(jpeg->dec_vdev);
> +
> +err_vdev_alloc:
> + v4l2_m2m_release(jpeg->m2m_dev);
> +
> +err_m2m:
> + v4l2_device_unregister(&jpeg->v4l2_dev);
> +
> +err_register:
> +err_irq:
> + return ret;
> +}
> +
> +static int mxc_jpeg_remove(struct platform_device *pdev)
> +{
> + unsigned int slot;
> + struct mxc_jpeg_dev *jpeg = platform_get_drvdata(pdev);
> +
> + for (slot = 0; slot < MXC_MAX_SLOTS; slot++)
> + mxc_jpeg_free_slot_data(jpeg, slot);
> +
> + video_unregister_device(jpeg->dec_vdev);
> + video_device_release(jpeg->dec_vdev);
> + v4l2_m2m_release(jpeg->m2m_dev);
> + v4l2_device_unregister(&jpeg->v4l2_dev);
> + mxc_jpeg_detach_pm_domains(jpeg);
> +
> + return 0;
> +}
> +
> +MODULE_DEVICE_TABLE(of, mxc_jpeg_match);
> +
> +static struct platform_driver mxc_jpeg_driver = {
> + .probe = mxc_jpeg_probe,
> + .remove = mxc_jpeg_remove,
> + .driver = {
> + .name = "mxc-jpeg",
> + .of_match_table = mxc_jpeg_match,
> + },
> +};
> +module_platform_driver(mxc_jpeg_driver);
> +
> +MODULE_AUTHOR("Zhengyu Shen <zhengyu.shen_1@xxxxxxx>");
> +MODULE_AUTHOR("Mirela Rabulea <mirela.rabulea@xxxxxxx>");
> +MODULE_DESCRIPTION("V4L2 driver for i.MX8 QXP/QM JPEG encoder/decoder");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg.h b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
> new file mode 100644
> index 000000000000..ef1670dafeb4
> --- /dev/null
> +++ b/drivers/media/platform/imx-jpeg/mxc-jpeg.h
> @@ -0,0 +1,184 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * i.MX8QXP/i.MX8QM JPEG encoder/decoder v4l2 driver
> + *
> + * Copyright 2018-2019 NXP
> + */
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fh.h>
> +
> +#ifndef _MXC_JPEG_CORE_H
> +#define _MXC_JPEG_CORE_H
> +
> +#define MXC_JPEG_NAME "mxc-jpeg"
> +#define MXC_JPEG_FMT_TYPE_ENC 0
> +#define MXC_JPEG_FMT_TYPE_RAW 1
> +#define MXC_JPEG_DEFAULT_WIDTH 1280
> +#define MXC_JPEG_DEFAULT_HEIGHT 720
> +#define MXC_JPEG_DEFAULT_PFMT V4L2_PIX_FMT_RGB24
> +#define MXC_JPEG_MIN_WIDTH 64
> +#define MXC_JPEG_MIN_HEIGHT 64
> +#define MXC_JPEG_MAX_WIDTH 0x2000
> +#define MXC_JPEG_MAX_HEIGHT 0x2000
> +#define MXC_JPEG_MAX_CFG_STREAM 0x1000
> +#define MXC_JPEG_H_ALIGN 3
> +#define MXC_JPEG_W_ALIGN 3
> +#define MXC_JPEG_MAX_SIZEIMAGE 0xFFFFFC00
> +#define MXC_JPEG_MAX_PLANES 2
> +
> +enum mxc_jpeg_enc_state {
> + MXC_JPEG_ENCODING = 0, /* jpeg encode phase */
> + MXC_JPEG_ENC_CONF = 1, /* jpeg encoder config phase */
> +};
> +
> +enum mxc_jpeg_mode {
> + MXC_JPEG_DECODE = 0, /* jpeg decode mode */
> + MXC_JPEG_ENCODE = 1, /* jpeg encode mode */
> +};
> +
> +/**
> + * struct jpeg_fmt - driver's internal color format data
> + * @name: format description
> + * @fourcc: fourcc code, 0 if not applicable
> + * @depth: number of bits per pixel
> + * @colplanes: number of color planes (1 for packed formats)
> + * @h_align: horizontal alignment order (align to 2^h_align)
> + * @v_align: vertical alignment order (align to 2^v_align)
> + * @flags: flags describing format applicability
> + */
> +struct mxc_jpeg_fmt {
> + char *name;
> + u32 fourcc;
> + int depth;
> + int colplanes;
> + int h_align;
> + int v_align;
> + u32 flags;
> +};
> +
> +struct mxc_jpeg_desc {
> + u32 next_descpt_ptr;
> + u32 buf_base0;
> + u32 buf_base1;
> + u32 line_pitch;
> + u32 stm_bufbase;
> + u32 stm_bufsize;
> + u32 imgsize;
> + u32 stm_ctrl;
> +} __packed;
> +
> +struct mxc_jpeg_q_data {
> + struct mxc_jpeg_fmt *fmt;
> + u32 sizeimage[MXC_JPEG_MAX_PLANES];
> + u32 bytesperline[MXC_JPEG_MAX_PLANES];
> + int w;
> + int w_adjusted;
> + int h;
> + int h_adjusted;
> + unsigned int sequence;
> +};
> +
> +struct mxc_jpeg_ctx {
> + struct mxc_jpeg_dev *mxc_jpeg;
> + struct mxc_jpeg_q_data out_q;
> + struct mxc_jpeg_q_data cap_q;
> + struct v4l2_fh fh;
> + enum mxc_jpeg_enc_state enc_state;
> + unsigned int stopping;
> + unsigned int slot;
> +};
> +
> +struct mxc_jpeg_slot_data {
> + bool used;
> + struct mxc_jpeg_desc *desc; // enc/dec descriptor
> + struct mxc_jpeg_desc *cfg_desc; // configuration descriptor
> + void *cfg_stream_vaddr; // configuration bitstream virtual address
> + unsigned int cfg_stream_size;
> + dma_addr_t desc_handle;
> + dma_addr_t cfg_desc_handle; // configuration descriptor dma address
> + dma_addr_t cfg_stream_handle; // configuration bitstream dma address
> +};
> +
> +struct mxc_jpeg_dev {
> + spinlock_t hw_lock; /* hardware access lock */
> + unsigned int mode;
> + struct mutex lock; /* v4l2 ioctls serialization */
> + struct platform_device *pdev;
> + struct device *dev;
> + void __iomem *base_reg;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_m2m_dev *m2m_dev;
> + struct video_device *dec_vdev;
> + struct mxc_jpeg_slot_data slot_data[MXC_MAX_SLOTS];
> + int num_domains;
> + struct device **pd_dev;
> + struct device_link **pd_link;
> +};
> +
> +/* JPEG marker identifiers */
> +#define SOF0 0xC0
> +#define SOF1 0xC1
> +#define SOF2 0xC2
> +#define SOS 0xDA
> +#define DHT 0xC4
> +#define APP14 0xEE
> +
> +/**
> + * struct mxc_jpeg_sof_comp - JPEG Start Of Frame component fields
> + * @id: component id
> + * @v: vertical sampling
> + * @h: horizontal sampling
> + * @quantization_table_no: id of quantization table
> + */
> +struct mxc_jpeg_sof_comp {
> + u8 id;
> + u8 v :4;
> + u8 h :4;
> + u8 quantization_table_no;
> +} __packed;
> +
> +#define MXC_JPEG_MAX_COMPONENTS 4
> +/**
> + * struct mxc_jpeg_sof - JPEG Start Of Frame marker fields
> + * @length: Start of Frame length
> + * @precision: precision (bits per pixel per color component)
> + * @height: image height
> + * @width: image width
> + * @components_no: number of color components
> + * @comp: component fields for each color component
> + */
> +struct mxc_jpeg_sof {
> + u16 length;
> + u8 precision;
> + u16 height, width;
> + u8 components_no;
> + struct mxc_jpeg_sof_comp comp[MXC_JPEG_MAX_COMPONENTS];
> +} __packed;
> +
> +/**
> + * struct mxc_jpeg_sof - JPEG Start Of Scan component fields
> + * @id: component id
> + * @huffman_table_no: id of the Huffman table
> + */
> +struct mxc_jpeg_sos_comp {
> + u8 id; /*component id*/
> + u8 huffman_table_no;
> +} __packed;
> +
> +/**
> + * struct mxc_jpeg_sof - JPEG Start Of Scan marker fields
> + * @length: Start of Frame length
> + * @components_no: number of color components
> + * @comp: SOS component fields for each color component
> + * @ignorable_bytes: ignorable bytes
> + */
> +struct mxc_jpeg_sos {
> + u16 length;
> + u8 components_no;
> + struct mxc_jpeg_sos_comp comp[MXC_JPEG_MAX_COMPONENTS];
> + u8 ignorable_bytes[3];
> +} __packed;
> +
> +#endif
>

Regards,

Hans

Next message: Sergey Senozhatsky: "Re: [PATCH] printk: fix buffer overflow potential for print_text()"
Previous message: Greg Kroah-Hartman: "Re: [PATCH] ACPI / device_sysfs: Use OF_MODALIAS for "compatible" modalias"
Next in thread: kernel test robot: "Re: [PATCH v7 3/9] media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]