Re: [PATCH v10 2/2] media: V3s: Add support for Allwinner CSI.

From: Sakari Ailus
Date: Tue Jun 26 2018 - 07:08:37 EST

Hi Yong,

My apologies for taking so long to review the set. A few comments below.

On Fri, May 04, 2018 at 03:09:05PM +0800, Yong Deng wrote:
> Allwinner V3s SoC features two CSI module. CSI0 is used for MIPI CSI-2
> interface and CSI1 is used for parallel interface. This is not
> documented in datasheet but by test and guess.
>
> This patch implement a v4l2 framework driver for it.
>
> Currently, the driver only support the parallel interface. MIPI-CSI2,
> ISP's support are not included in this patch.
>
> Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Reviewed-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> Tested-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> Signed-off-by: Yong Deng <yong.deng@xxxxxxxxxxxx>
> ---
> MAINTAINERS | 8 +
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/Makefile | 2 +
> drivers/media/platform/sunxi/sun6i-csi/Kconfig | 9 +
> drivers/media/platform/sunxi/sun6i-csi/Makefile | 3 +
> drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 932 +++++++++++++++++++++
> drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h | 145 ++++
> .../media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h | 196 +++++
> .../media/platform/sunxi/sun6i-csi/sun6i_video.c | 767 +++++++++++++++++
> .../media/platform/sunxi/sun6i-csi/sun6i_video.h | 53 ++
> 10 files changed, 2116 insertions(+)
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/Kconfig
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/Makefile
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> create mode 100644 drivers/media/platform/sunxi/sun6i-csi/sun6i_video.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0a1410d5a621..a8f9fe91dd14 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3771,6 +3771,14 @@ M: Jaya Kumar <jayakumar.alsa@xxxxxxxxx>
> S: Maintained
> F: sound/pci/cs5535audio/
>
> +CSI DRIVERS FOR ALLWINNER V3s
> +M: Yong Deng <yong.deng@xxxxxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +T: git git://linuxtv.org/media_tree.git
> +S: Maintained
> +F: drivers/media/platform/sunxi/sun6i-csi/
> +F: Documentation/devicetree/bindings/media/sun6i-csi.txt
> +
> CW1200 WLAN driver
> M: Solomon Peachy <pizza@xxxxxxxxxxxx>
> S: Maintained
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index e3229f7baed1..43f25c9c05e1 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -138,6 +138,7 @@ source "drivers/media/platform/am437x/Kconfig"
> source "drivers/media/platform/xilinx/Kconfig"
> source "drivers/media/platform/rcar-vin/Kconfig"
> source "drivers/media/platform/atmel/Kconfig"
> +source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
>
> config VIDEO_TI_CAL
> tristate "TI CAL (Camera Adaptation Layer) driver"
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 932515df4477..69472cbfa360 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -92,3 +92,5 @@ obj-$(CONFIG_VIDEO_QCOM_CAMSS) += qcom/camss-8x16/
> obj-$(CONFIG_VIDEO_QCOM_VENUS) += qcom/venus/
>
> obj-y += meson/
> +
> +obj-$(CONFIG_VIDEO_SUN6I_CSI) += sunxi/sun6i-csi/
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/Kconfig b/drivers/media/platform/sunxi/sun6i-csi/Kconfig
> new file mode 100644
> index 000000000000..018e3ec788c0
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/Kconfig
> @@ -0,0 +1,9 @@
> +config VIDEO_SUN6I_CSI
> + tristate "Allwinner V3s Camera Sensor Interface driver"
> + depends on VIDEO_V4L2 && COMMON_CLK && VIDEO_V4L2_SUBDEV_API && HAS_DMA
> + depends on ARCH_SUNXI || COMPILE_TEST
> + select VIDEOBUF2_DMA_CONTIG
> + select REGMAP_MMIO
> + select V4L2_FWNODE
> + help
> + Support for the Allwinner Camera Sensor Interface Controller on V3s.
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/Makefile b/drivers/media/platform/sunxi/sun6i-csi/Makefile
> new file mode 100644
> index 000000000000..213cb6be9e9c
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/Makefile
> @@ -0,0 +1,3 @@
> +sun6i-csi-y += sun6i_video.o sun6i_csi.o
> +
> +obj-$(CONFIG_VIDEO_SUN6I_CSI) += sun6i-csi.o
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> new file mode 100644
> index 000000000000..d03a367dad44
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -0,0 +1,932 @@
> +// SPDX-License-Identifier: GPL-2.0

Doesn't match MODULE_LICENSE at the end. Which one is it?

> +/*
> + * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
> + * All rights reserved.
> + * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/ioctl.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +#include <linux/sched.h>
> +#include <linux/sizes.h>
> +#include <linux/slab.h>
> +
> +#include "sun6i_csi.h"
> +#include "sun6i_csi_reg.h"
> +
> +#define MODULE_NAME "sun6i-csi"
> +
> +struct sun6i_csi_dev {
> + struct sun6i_csi csi;
> + struct device *dev;
> +
> + struct regmap *regmap;
> + struct clk *clk_mod;
> + struct clk *clk_ram;
> + struct reset_control *rstc_bus;
> +
> + int planar_offset[3];
> +};
> +
> +static const u32 supported_pixformats[] = {
> + V4L2_PIX_FMT_SBGGR8,
> + V4L2_PIX_FMT_SGBRG8,
> + V4L2_PIX_FMT_SGRBG8,
> + V4L2_PIX_FMT_SRGGB8,
> + V4L2_PIX_FMT_SBGGR10,
> + V4L2_PIX_FMT_SGBRG10,
> + V4L2_PIX_FMT_SGRBG10,
> + V4L2_PIX_FMT_SRGGB10,
> + V4L2_PIX_FMT_SBGGR12,
> + V4L2_PIX_FMT_SGBRG12,
> + V4L2_PIX_FMT_SGRBG12,
> + V4L2_PIX_FMT_SRGGB12,
> + V4L2_PIX_FMT_YUYV,
> + V4L2_PIX_FMT_YVYU,
> + V4L2_PIX_FMT_UYVY,
> + V4L2_PIX_FMT_VYUY,
> + V4L2_PIX_FMT_HM12,
> + V4L2_PIX_FMT_NV12,
> + V4L2_PIX_FMT_NV21,
> + V4L2_PIX_FMT_YUV420,
> + V4L2_PIX_FMT_YVU420,
> + V4L2_PIX_FMT_NV16,
> + V4L2_PIX_FMT_NV61,
> + V4L2_PIX_FMT_YUV422P,
> +};
> +
> +static inline struct sun6i_csi_dev *sun6i_csi_to_dev(struct sun6i_csi *csi)
> +{
> + return container_of(csi, struct sun6i_csi_dev, csi);
> +}
> +
> +int sun6i_csi_get_supported_pixformats(struct sun6i_csi *csi,
> + const u32 **pixformats)
> +{
> + if (pixformats != NULL)
> + *pixformats = supported_pixformats;
> +
> + return ARRAY_SIZE(supported_pixformats);
> +}

This is only relevant in the context of in-memory formats (same goes for
supported_formats) --- how about moving them to the other file?

> +
> +/* TODO add 10&12 bit YUV, RGB support */
> +bool sun6i_csi_is_format_supported(struct sun6i_csi *csi,
> + u32 pixformat, u32 mbus_code)
> +{
> + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +
> + /*
> + * Some video receivers have the ability to be compatible with
> + * 8bit and 16bit bus width.
> + * Identify the media bus format from device tree.
> + */
> + if ((sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_PARALLEL
> + || sdev->csi.v4l2_ep.bus_type == V4L2_MBUS_BT656)
> + && sdev->csi.v4l2_ep.bus.parallel.bus_width == 16) {
> + switch (pixformat) {
> + case V4L2_PIX_FMT_HM12:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YVU420:
> + case V4L2_PIX_FMT_YUV422P:
> + switch (mbus_code) {
> + case MEDIA_BUS_FMT_UYVY8_1X16:
> + case MEDIA_BUS_FMT_VYUY8_1X16:
> + case MEDIA_BUS_FMT_YUYV8_1X16:
> + case MEDIA_BUS_FMT_YVYU8_1X16:
> + return true;
> + default:
> + dev_dbg(sdev->dev, "Unsupported mbus code: 0x%x\n",
> + mbus_code);
> + break;
> + }
> + break;
> + default:
> + dev_dbg(sdev->dev, "Unsupported pixformat: 0x%x\n",
> + pixformat);
> + break;
> + }
> + return false;
> + }
> +
> + switch (pixformat) {
> + case V4L2_PIX_FMT_SBGGR8:
> + return (mbus_code == MEDIA_BUS_FMT_SBGGR8_1X8);
> + case V4L2_PIX_FMT_SGBRG8:
> + return (mbus_code == MEDIA_BUS_FMT_SGBRG8_1X8);
> + case V4L2_PIX_FMT_SGRBG8:
> + return (mbus_code == MEDIA_BUS_FMT_SGRBG8_1X8);
> + case V4L2_PIX_FMT_SRGGB8:
> + return (mbus_code == MEDIA_BUS_FMT_SRGGB8_1X8);
> + case V4L2_PIX_FMT_SBGGR10:
> + return (mbus_code == MEDIA_BUS_FMT_SBGGR10_1X10);
> + case V4L2_PIX_FMT_SGBRG10:
> + return (mbus_code == MEDIA_BUS_FMT_SGBRG10_1X10);
> + case V4L2_PIX_FMT_SGRBG10:
> + return (mbus_code == MEDIA_BUS_FMT_SGRBG10_1X10);
> + case V4L2_PIX_FMT_SRGGB10:
> + return (mbus_code == MEDIA_BUS_FMT_SRGGB10_1X10);
> + case V4L2_PIX_FMT_SBGGR12:
> + return (mbus_code == MEDIA_BUS_FMT_SBGGR12_1X12);
> + case V4L2_PIX_FMT_SGBRG12:
> + return (mbus_code == MEDIA_BUS_FMT_SGBRG12_1X12);
> + case V4L2_PIX_FMT_SGRBG12:
> + return (mbus_code == MEDIA_BUS_FMT_SGRBG12_1X12);
> + case V4L2_PIX_FMT_SRGGB12:
> + return (mbus_code == MEDIA_BUS_FMT_SRGGB12_1X12);
> +
> + case V4L2_PIX_FMT_YUYV:
> + return (mbus_code == MEDIA_BUS_FMT_YUYV8_2X8);
> + case V4L2_PIX_FMT_YVYU:
> + return (mbus_code == MEDIA_BUS_FMT_YVYU8_2X8);
> + case V4L2_PIX_FMT_UYVY:
> + return (mbus_code == MEDIA_BUS_FMT_UYVY8_2X8);
> + case V4L2_PIX_FMT_VYUY:
> + return (mbus_code == MEDIA_BUS_FMT_VYUY8_2X8);
> +
> + case V4L2_PIX_FMT_HM12:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YVU420:
> + case V4L2_PIX_FMT_YUV422P:
> + switch (mbus_code) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + return true;
> + default:
> + dev_dbg(sdev->dev, "Unsupported mbus code: 0x%x\n",
> + mbus_code);
> + break;
> + }
> + break;
> + default:
> + dev_dbg(sdev->dev, "Unsupported pixformat: 0x%x\n", pixformat);
> + break;
> + }
> +
> + return false;
> +}
> +
> +int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable)
> +{
> + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> + struct regmap *regmap = sdev->regmap;
> + int ret;
> +
> + if (!enable) {
> + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> +
> + clk_disable_unprepare(sdev->clk_ram);
> + clk_disable_unprepare(sdev->clk_mod);
> + reset_control_assert(sdev->rstc_bus);
> + return 0;
> + }
> +
> + ret = clk_prepare_enable(sdev->clk_mod);
> + if (ret) {
> + dev_err(sdev->dev, "Enable csi clk err %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(sdev->clk_ram);
> + if (ret) {
> + dev_err(sdev->dev, "Enable clk_dram_csi clk err %d\n", ret);
> + return ret;
> + }

You could use clk_bulk_prepare_enable() (and clk_bulk_disable_unprepare()
above). Either way, you need to unprepare and disable sdev->clk_mod here if
preparing or enabling sdev->clk_ram fails above. Same for reset below.

> +
> + ret = reset_control_deassert(sdev->rstc_bus);
> + if (ret) {
> + dev_err(sdev->dev, "reset err %d\n", ret);
> + return ret;
> + }
> +
> + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, CSI_EN_CSI_EN);
> +
> + return 0;
> +}
> +
> +static enum csi_input_fmt get_csi_input_format(struct sun6i_csi_dev *sdev,
> + u32 mbus_code, u32 pixformat)
> +{
> + /* bayer */
> + if ((mbus_code & 0xF000) == 0x3000)
> + return CSI_INPUT_FORMAT_RAW;
> +
> + switch (pixformat) {
> + case V4L2_PIX_FMT_YUYV:
> + case V4L2_PIX_FMT_YVYU:
> + case V4L2_PIX_FMT_UYVY:
> + case V4L2_PIX_FMT_VYUY:
> + return CSI_INPUT_FORMAT_RAW;
> + default:
> + break;
> + }
> +
> + /* not support YUV420 input format yet */
> + dev_dbg(sdev->dev, "Select YUV422 as default input format of CSI.\n");
> + return CSI_INPUT_FORMAT_YUV422;
> +}
> +
> +static enum csi_output_fmt get_csi_output_format(struct sun6i_csi_dev *sdev,
> + u32 pixformat, u32 field)
> +{
> + bool buf_interlaced = false;
> +
> + if (field == V4L2_FIELD_INTERLACED
> + || field == V4L2_FIELD_INTERLACED_TB
> + || field == V4L2_FIELD_INTERLACED_BT)
> + buf_interlaced = true;
> +
> + switch (pixformat) {
> + case V4L2_PIX_FMT_SBGGR8:
> + case V4L2_PIX_FMT_SGBRG8:
> + case V4L2_PIX_FMT_SGRBG8:
> + case V4L2_PIX_FMT_SRGGB8:
> + return buf_interlaced ? CSI_FRAME_RAW_8 : CSI_FIELD_RAW_8;
> + case V4L2_PIX_FMT_SBGGR10:
> + case V4L2_PIX_FMT_SGBRG10:
> + case V4L2_PIX_FMT_SGRBG10:
> + case V4L2_PIX_FMT_SRGGB10:
> + return buf_interlaced ? CSI_FRAME_RAW_10 : CSI_FIELD_RAW_10;
> + case V4L2_PIX_FMT_SBGGR12:
> + case V4L2_PIX_FMT_SGBRG12:
> + case V4L2_PIX_FMT_SGRBG12:
> + case V4L2_PIX_FMT_SRGGB12:
> + return buf_interlaced ? CSI_FRAME_RAW_12 : CSI_FIELD_RAW_12;
> +
> + case V4L2_PIX_FMT_YUYV:
> + case V4L2_PIX_FMT_YVYU:
> + case V4L2_PIX_FMT_UYVY:
> + case V4L2_PIX_FMT_VYUY:
> + return buf_interlaced ? CSI_FRAME_RAW_8 : CSI_FIELD_RAW_8;
> +
> + case V4L2_PIX_FMT_HM12:
> + return buf_interlaced ? CSI_FRAME_MB_YUV420 :
> + CSI_FIELD_MB_YUV420;
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + return buf_interlaced ? CSI_FRAME_UV_CB_YUV420 :
> + CSI_FIELD_UV_CB_YUV420;
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YVU420:
> + return buf_interlaced ? CSI_FRAME_PLANAR_YUV420 :
> + CSI_FIELD_PLANAR_YUV420;
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + return buf_interlaced ? CSI_FRAME_UV_CB_YUV422 :
> + CSI_FIELD_UV_CB_YUV422;
> + case V4L2_PIX_FMT_YUV422P:
> + return buf_interlaced ? CSI_FRAME_PLANAR_YUV422 :
> + CSI_FIELD_PLANAR_YUV422;
> + default:
> + dev_warn(sdev->dev, "Unsupported pixformat: 0x%x\n", pixformat);
> + break;
> + }
> +
> + return CSI_FIELD_RAW_8;
> +}
> +
> +static enum csi_input_seq get_csi_input_seq(struct sun6i_csi_dev *sdev,
> + u32 mbus_code, u32 pixformat)
> +{
> +
> + switch (pixformat) {
> + case V4L2_PIX_FMT_HM12:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YUV422P:
> + switch (mbus_code) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + case MEDIA_BUS_FMT_UYVY8_1X16:
> + return CSI_INPUT_SEQ_UYVY;
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + case MEDIA_BUS_FMT_VYUY8_1X16:
> + return CSI_INPUT_SEQ_VYUY;
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + case MEDIA_BUS_FMT_YUYV8_1X16:
> + return CSI_INPUT_SEQ_YUYV;
> + case MEDIA_BUS_FMT_YVYU8_1X16:
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + return CSI_INPUT_SEQ_YVYU;
> + default:
> + dev_warn(sdev->dev, "Unsupported mbus code: 0x%x\n",
> + mbus_code);
> + break;
> + }
> + break;
> + case V4L2_PIX_FMT_NV21:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_YVU420:
> + switch (mbus_code) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + case MEDIA_BUS_FMT_UYVY8_1X16:
> + return CSI_INPUT_SEQ_VYUY;
> + case MEDIA_BUS_FMT_VYUY8_2X8:
> + case MEDIA_BUS_FMT_VYUY8_1X16:
> + return CSI_INPUT_SEQ_UYVY;
> + case MEDIA_BUS_FMT_YUYV8_2X8:
> + case MEDIA_BUS_FMT_YUYV8_1X16:
> + return CSI_INPUT_SEQ_YVYU;
> + case MEDIA_BUS_FMT_YVYU8_1X16:
> + case MEDIA_BUS_FMT_YVYU8_2X8:
> + return CSI_INPUT_SEQ_YUYV;
> + default:
> + dev_warn(sdev->dev, "Unsupported mbus code: 0x%x\n",
> + mbus_code);
> + break;
> + }
> + break;
> +
> + case V4L2_PIX_FMT_YUYV:
> + return CSI_INPUT_SEQ_YUYV;
> +
> + default:
> + dev_warn(sdev->dev, "Unsupported pixformat: 0x%x, defaulting to YUYV\n",
> + pixformat);
> + break;
> + }
> +
> + return CSI_INPUT_SEQ_YUYV;
> +}
> +
> +static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> +{
> + struct v4l2_fwnode_endpoint *endpoint = &sdev->csi.v4l2_ep;
> + unsigned char bus_width;
> + u32 flags;
> + u32 cfg;
> +
> + bus_width = endpoint->bus.parallel.bus_width;
> +
> + regmap_read(sdev->regmap, CSI_IF_CFG_REG, &cfg);
> +
> + cfg &= ~(CSI_IF_CFG_CSI_IF_MASK | CSI_IF_CFG_MIPI_IF_MASK |
> + CSI_IF_CFG_IF_DATA_WIDTH_MASK |
> + CSI_IF_CFG_CLK_POL_MASK | CSI_IF_CFG_VREF_POL_MASK |
> + CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK);
> +
> + switch (endpoint->bus_type) {
> + case V4L2_MBUS_PARALLEL:
> + cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> +
> + flags = endpoint->bus.parallel.flags;
> +
> + cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_YUV422_16BIT :
> + CSI_IF_CFG_CSI_IF_YUV422_INTLV;
> +
> + if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> + cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> +
> + if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
> + cfg |= CSI_IF_CFG_VREF_POL_POSITIVE;
> + if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
> + cfg |= CSI_IF_CFG_HREF_POL_POSITIVE;
> +
> + if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
> + cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> + break;
> + case V4L2_MBUS_BT656:
> + cfg |= CSI_IF_CFG_MIPI_IF_CSI;
> +
> + flags = endpoint->bus.parallel.flags;
> +
> + cfg |= (bus_width == 16) ? CSI_IF_CFG_CSI_IF_BT1120 :
> + CSI_IF_CFG_CSI_IF_BT656;
> +
> + if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
> + cfg |= CSI_IF_CFG_FIELD_POSITIVE;
> +
> + if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
> + cfg |= CSI_IF_CFG_CLK_POL_FALLING_EDGE;
> + break;
> + default:
> + dev_warn(sdev->dev, "Unsupported bus type: %d\n",
> + endpoint->bus_type);
> + break;
> + }
> +
> + switch (bus_width) {
> + case 8:
> + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> + break;
> + case 10:
> + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> + break;
> + case 12:
> + cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> + break;
> + case 16: /* No need to configure DATA_WIDTH for 16bit */
> + break;
> + default:
> + dev_warn(sdev->dev, "Unsupported bus width: %d\n", bus_width);
> + break;
> + }
> +
> + regmap_write(sdev->regmap, CSI_IF_CFG_REG, cfg);
> +}
> +
> +static void sun6i_csi_set_format(struct sun6i_csi_dev *sdev)
> +{
> + struct sun6i_csi *csi = &sdev->csi;
> + u32 cfg;
> + u32 val;
> +
> + regmap_read(sdev->regmap, CSI_CH_CFG_REG, &cfg);
> +
> + cfg &= ~(CSI_CH_CFG_INPUT_FMT_MASK |
> + CSI_CH_CFG_OUTPUT_FMT_MASK | CSI_CH_CFG_VFLIP_EN |
> + CSI_CH_CFG_HFLIP_EN | CSI_CH_CFG_FIELD_SEL_MASK |
> + CSI_CH_CFG_INPUT_SEQ_MASK);
> +
> + val = get_csi_input_format(sdev, csi->config.code,
> + csi->config.pixelformat);
> + cfg |= CSI_CH_CFG_INPUT_FMT(val);
> +
> + val = get_csi_output_format(sdev, csi->config.pixelformat,
> + csi->config.field);
> + cfg |= CSI_CH_CFG_OUTPUT_FMT(val);
> +
> + val = get_csi_input_seq(sdev, csi->config.code,
> + csi->config.pixelformat);
> + cfg |= CSI_CH_CFG_INPUT_SEQ(val);
> +
> + if (csi->config.field == V4L2_FIELD_TOP)
> + cfg |= CSI_CH_CFG_FIELD_SEL_FIELD0;
> + else if (csi->config.field == V4L2_FIELD_BOTTOM)
> + cfg |= CSI_CH_CFG_FIELD_SEL_FIELD1;
> + else
> + cfg |= CSI_CH_CFG_FIELD_SEL_BOTH;
> +
> + regmap_write(sdev->regmap, CSI_CH_CFG_REG, cfg);
> +}
> +
> +static void sun6i_csi_set_window(struct sun6i_csi_dev *sdev)
> +{
> + struct sun6i_csi_config *config = &sdev->csi.config;
> + u32 bytesperline_y;
> + u32 bytesperline_c;
> + int *planar_offset = sdev->planar_offset;
> + u32 width = config->width;
> + u32 height = config->height;
> + u32 hor_len = width;
> +
> + switch (config->pixelformat) {
> + case V4L2_PIX_FMT_YUYV:
> + case V4L2_PIX_FMT_YVYU:
> + case V4L2_PIX_FMT_UYVY:
> + case V4L2_PIX_FMT_VYUY:
> + dev_dbg(sdev->dev,
> + "Horizontal length should be 2 times of width for packed YUV formats!\n");
> + hor_len = width * 2;
> + break;
> + default:
> + break;
> + }
> +
> + regmap_write(sdev->regmap, CSI_CH_HSIZE_REG,
> + CSI_CH_HSIZE_HOR_LEN(hor_len) |
> + CSI_CH_HSIZE_HOR_START(0));
> + regmap_write(sdev->regmap, CSI_CH_VSIZE_REG,
> + CSI_CH_VSIZE_VER_LEN(height) |
> + CSI_CH_VSIZE_VER_START(0));
> +
> + planar_offset[0] = 0;
> + switch (config->pixelformat) {
> + case V4L2_PIX_FMT_HM12:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + bytesperline_y = width;
> + bytesperline_c = width;
> + planar_offset[1] = bytesperline_y * height;
> + planar_offset[2] = -1;
> + break;
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YVU420:
> + bytesperline_y = width;
> + bytesperline_c = width / 2;
> + planar_offset[1] = bytesperline_y * height;
> + planar_offset[2] = planar_offset[1] +
> + bytesperline_c * height / 2;
> + break;
> + case V4L2_PIX_FMT_YUV422P:
> + bytesperline_y = width;
> + bytesperline_c = width / 2;
> + planar_offset[1] = bytesperline_y * height;
> + planar_offset[2] = planar_offset[1] +
> + bytesperline_c * height;
> + break;
> + default: /* raw */
> + dev_dbg(sdev->dev,
> + "Calculating pixelformat(0x%x)'s bytesperline as a packed format\n",
> + config->pixelformat);
> + bytesperline_y = (sun6i_csi_get_bpp(config->pixelformat) *
> + config->width) / 8;
> + bytesperline_c = 0;
> + planar_offset[1] = -1;
> + planar_offset[2] = -1;
> + break;
> + }
> +
> + regmap_write(sdev->regmap, CSI_CH_BUF_LEN_REG,
> + CSI_CH_BUF_LEN_BUF_LEN_C(bytesperline_c) |
> + CSI_CH_BUF_LEN_BUF_LEN_Y(bytesperline_y));
> +}
> +
> +int sun6i_csi_update_config(struct sun6i_csi *csi,
> + struct sun6i_csi_config *config)
> +{
> + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +
> + if (config == NULL)
> + return -EINVAL;
> +
> + memcpy(&csi->config, config, sizeof(csi->config));
> +
> + sun6i_csi_setup_bus(sdev);
> + sun6i_csi_set_format(sdev);
> + sun6i_csi_set_window(sdev);
> +
> + return 0;
> +}
> +
> +void sun6i_csi_update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr)
> +{
> + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> +
> + regmap_write(sdev->regmap, CSI_CH_F0_BUFA_REG,
> + (addr + sdev->planar_offset[0]) >> 2);
> + if (sdev->planar_offset[1] != -1)
> + regmap_write(sdev->regmap, CSI_CH_F1_BUFA_REG,
> + (addr + sdev->planar_offset[1]) >> 2);
> + if (sdev->planar_offset[2] != -1)
> + regmap_write(sdev->regmap, CSI_CH_F2_BUFA_REG,
> + (addr + sdev->planar_offset[2]) >> 2);
> +}
> +
> +void sun6i_csi_set_stream(struct sun6i_csi *csi, bool enable)
> +{
> + struct sun6i_csi_dev *sdev = sun6i_csi_to_dev(csi);
> + struct regmap *regmap = sdev->regmap;
> +
> + if (!enable) {
> + regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON, 0);
> + regmap_write(regmap, CSI_CH_INT_EN_REG, 0);
> + return;
> + }
> +
> + regmap_write(regmap, CSI_CH_INT_STA_REG, 0xFF);
> + regmap_write(regmap, CSI_CH_INT_EN_REG,
> + CSI_CH_INT_EN_HB_OF_INT_EN |
> + CSI_CH_INT_EN_FIFO2_OF_INT_EN |
> + CSI_CH_INT_EN_FIFO1_OF_INT_EN |
> + CSI_CH_INT_EN_FIFO0_OF_INT_EN |
> + CSI_CH_INT_EN_FD_INT_EN |
> + CSI_CH_INT_EN_CD_INT_EN);
> +
> + regmap_update_bits(regmap, CSI_CAP_REG, CSI_CAP_CH0_VCAP_ON,
> + CSI_CAP_CH0_VCAP_ON);
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Media Controller and V4L2
> + */
> +static int sun6i_csi_link_entity(struct sun6i_csi *csi,
> + struct media_entity *entity,
> + struct fwnode_handle *fwnode)
> +{
> + struct media_entity *sink;
> + struct media_pad *sink_pad;
> + struct media_link *link;
> + int src_pad_index;
> + int ret;
> +
> + ret = media_entity_get_fwnode_pad(entity, fwnode, MEDIA_PAD_FL_SOURCE);
> + if (ret < 0) {
> + dev_err(csi->dev, "%s: no source pad in external entity %s\n",
> + __func__, entity->name);
> + return -EINVAL;
> + }
> +
> + src_pad_index = ret;
> +
> + sink = &csi->video.vdev.entity;
> + sink_pad = &csi->video.pad;
> +
> + dev_dbg(csi->dev, "creating %s:%u -> %s:%u link\n",
> + entity->name, src_pad_index, sink->name, sink_pad->index);
> + ret = media_create_pad_link(entity, src_pad_index, sink,
> + sink_pad->index, 0);
> + if (ret < 0) {
> + dev_err(csi->dev, "failed to create %s:%u -> %s:%u link\n",
> + entity->name, src_pad_index,
> + sink->name, sink_pad->index);
> + return ret;
> + }
> +
> + link = media_entity_find_link(&entity->pads[src_pad_index], sink_pad);
> + return media_entity_setup_link(link, MEDIA_LNK_FL_ENABLED);

No need for link setup here; just set the ENABLED flag when you create the
link. If there's no use case for disabling it, you should also set the
IMMUTABLE flag.

> +}
> +
> +static int sun6i_subdev_notify_complete(struct v4l2_async_notifier *notifier)
> +{
> + struct sun6i_csi *csi = container_of(notifier, struct sun6i_csi,
> + notifier);
> + struct v4l2_device *v4l2_dev = &csi->v4l2_dev;
> + struct v4l2_subdev *sd;
> + int ret;
> +
> + dev_dbg(csi->dev, "notify complete, all subdevs registered\n");
> +
> + if (notifier->num_subdevs != 1)
> + return -EINVAL;
> +
> + sd = list_first_entry(&v4l2_dev->subdevs, struct v4l2_subdev, list);
> + if (sd == NULL)
> + return -EINVAL;
> +
> + ret = sun6i_csi_link_entity(csi, &sd->entity, sd->fwnode);
> + if (ret < 0)
> + return ret;
> +
> + ret = v4l2_device_register_subdev_nodes(&csi->v4l2_dev);
> + if (ret < 0)
> + return ret;
> +
> + return media_device_register(&csi->media_dev);
> +}
> +
> +static const struct v4l2_async_notifier_operations sun6i_csi_async_ops = {
> + .complete = sun6i_subdev_notify_complete,
> +};
> +
> +static int sun6i_csi_fwnode_parse(struct device *dev,
> + struct v4l2_fwnode_endpoint *vep,
> + struct v4l2_async_subdev *asd)
> +{
> + struct sun6i_csi *csi = dev_get_drvdata(dev);
> +
> + if (vep->base.port || vep->base.id) {
> + dev_warn(dev, "Only support a single port with one endpoint\n");
> + return -ENOTCONN;
> + }
> +
> + switch (vep->bus_type) {
> + case V4L2_MBUS_PARALLEL:
> + case V4L2_MBUS_BT656:
> + csi->v4l2_ep = *vep;
> + return 0;
> + default:
> + dev_err(dev, "Unsupported media bus type\n");
> + return -ENOTCONN;
> + }
> +}
> +
> +static void sun6i_csi_v4l2_cleanup(struct sun6i_csi *csi)
> +{
> + v4l2_async_notifier_cleanup(&csi->notifier);
> + v4l2_async_notifier_unregister(&csi->notifier);

The other way. First unregister, then cleanup.

> + sun6i_video_cleanup(&csi->video);
> + v4l2_device_unregister(&csi->v4l2_dev);
> + media_device_unregister(&csi->media_dev);
> + media_device_cleanup(&csi->media_dev);
> +}
> +
> +static int sun6i_csi_v4l2_init(struct sun6i_csi *csi)
> +{
> + int ret;
> +
> + csi->media_dev.dev = csi->dev;
> + strlcpy(csi->media_dev.model, "Allwinner Video Capture Device",
> + sizeof(csi->media_dev.model));
> + csi->media_dev.hw_revision = 0;
> +
> + media_device_init(&csi->media_dev);
> +
> + ret = v4l2_ctrl_handler_init(&csi->ctrl_handler, 0);
> + if (ret) {
> + dev_err(csi->dev, "V4L2 controls handler init failed (%d)\n",
> + ret);
> + goto clean_media;
> + }
> +
> + csi->v4l2_dev.mdev = &csi->media_dev;
> + csi->v4l2_dev.ctrl_handler = &csi->ctrl_handler;
> + ret = v4l2_device_register(csi->dev, &csi->v4l2_dev);
> + if (ret) {
> + dev_err(csi->dev, "V4L2 device registration failed (%d)\n",
> + ret);
> + goto clean_media;
> + }
> +
> + ret = sun6i_video_init(&csi->video, csi, "sun6i-csi");
> + if (ret)
> + goto unreg_v4l2;
> +
> + ret = v4l2_async_notifier_parse_fwnode_endpoints(
> + csi->dev, &csi->notifier, sizeof(struct v4l2_async_subdev),
> + sun6i_csi_fwnode_parse);
> + if (ret)
> + goto clean_video;
> +
> + csi->notifier.ops = &sun6i_csi_async_ops;
> +
> + ret = v4l2_async_notifier_register(&csi->v4l2_dev, &csi->notifier);
> + if (ret) {
> + dev_err(csi->dev, "notifier registration failed\n");
> + goto clean_notifier;
> + }
> +
> + return 0;
> +
> +clean_notifier:
> + v4l2_async_notifier_cleanup(&csi->notifier);
> +clean_video:
> + sun6i_video_cleanup(&csi->video);
> +unreg_v4l2:
> + v4l2_device_unregister(&csi->v4l2_dev);
> +clean_media:
> + media_device_cleanup(&csi->media_dev);
> +
> + return ret;
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Resources and IRQ
> + */
> +static irqreturn_t sun6i_csi_isr(int irq, void *dev_id)
> +{
> + struct sun6i_csi_dev *sdev = (struct sun6i_csi_dev *)dev_id;
> + struct regmap *regmap = sdev->regmap;
> + u32 status;
> +
> + regmap_read(regmap, CSI_CH_INT_STA_REG, &status);
> +
> + if (!(status & 0xFF))
> + return IRQ_NONE;
> +
> + if ((status & CSI_CH_INT_STA_FIFO0_OF_PD) ||
> + (status & CSI_CH_INT_STA_FIFO1_OF_PD) ||
> + (status & CSI_CH_INT_STA_FIFO2_OF_PD) ||
> + (status & CSI_CH_INT_STA_HB_OF_PD)) {
> + regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN, 0);
> + regmap_update_bits(regmap, CSI_EN_REG, CSI_EN_CSI_EN,
> + CSI_EN_CSI_EN);
> + return IRQ_HANDLED;
> + }
> +
> + if (status & CSI_CH_INT_STA_FD_PD)
> + sun6i_video_frame_done(&sdev->csi.video);
> +
> + regmap_write(regmap, CSI_CH_INT_STA_REG, status);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static const struct regmap_config sun6i_csi_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = 0x1000,
> +};
> +
> +static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
> + struct platform_device *pdev)
> +{
> + struct resource *res;
> + void __iomem *io_base;
> + int ret;
> + int irq;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + io_base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(io_base))
> + return PTR_ERR(io_base);
> +
> + sdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "bus", io_base,
> + &sun6i_csi_regmap_config);
> + if (IS_ERR(sdev->regmap)) {
> + dev_err(&pdev->dev, "Failed to init register map\n");
> + return PTR_ERR(sdev->regmap);
> + }
> +
> + sdev->clk_mod = devm_clk_get(&pdev->dev, "mod");
> + if (IS_ERR(sdev->clk_mod)) {
> + dev_err(&pdev->dev, "Unable to acquire csi clock\n");
> + return PTR_ERR(sdev->clk_mod);
> + }
> +
> + sdev->clk_ram = devm_clk_get(&pdev->dev, "ram");
> + if (IS_ERR(sdev->clk_ram)) {
> + dev_err(&pdev->dev, "Unable to acquire dram-csi clock\n");
> + return PTR_ERR(sdev->clk_ram);
> + }
> +
> + sdev->rstc_bus = devm_reset_control_get_shared(&pdev->dev, NULL);
> + if (IS_ERR(sdev->rstc_bus)) {
> + dev_err(&pdev->dev, "Cannot get reset controller\n");
> + return PTR_ERR(sdev->rstc_bus);
> + }
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(&pdev->dev, "No csi IRQ specified\n");
> + ret = -ENXIO;
> + return ret;
> + }
> +
> + ret = devm_request_irq(&pdev->dev, irq, sun6i_csi_isr, 0, MODULE_NAME,
> + sdev);
> + if (ret) {
> + dev_err(&pdev->dev, "Cannot request csi IRQ\n");
> + return ret;
> + }
> + return 0;
> +}
> +
> +/*
> + * PHYS_OFFSET isn't available on all architectures. In order to
> + * accomodate for COMPILE_TEST, let's define it to something dumb.
> + */
> +#ifndef PHYS_OFFSET
> +#define PHYS_OFFSET 0
> +#endif
> +
> +static int sun6i_csi_probe(struct platform_device *pdev)
> +{
> + struct sun6i_csi_dev *sdev;
> + int ret;
> +
> + sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
> + if (!sdev)
> + return -ENOMEM;
> +
> + sdev->dev = &pdev->dev;
> + /* The DMA bus has the memory mapped at 0 */
> + sdev->dev->dma_pfn_offset = PHYS_OFFSET >> PAGE_SHIFT;
> +
> + ret = sun6i_csi_resource_request(sdev, pdev);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, sdev);
> +
> + sdev->csi.dev = &pdev->dev;
> + ret = sun6i_csi_v4l2_init(&sdev->csi);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int sun6i_csi_remove(struct platform_device *pdev)
> +{
> + struct sun6i_csi_dev *sdev = platform_get_drvdata(pdev);
> +
> + sun6i_csi_v4l2_cleanup(&sdev->csi);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id sun6i_csi_of_match[] = {
> + { .compatible = "allwinner,sun8i-v3s-csi", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, sun6i_csi_of_match);
> +
> +static struct platform_driver sun6i_csi_platform_driver = {
> + .probe = sun6i_csi_probe,
> + .remove = sun6i_csi_remove,
> + .driver = {
> + .name = MODULE_NAME,
> + .of_match_table = of_match_ptr(sun6i_csi_of_match),
> + },
> +};
> +module_platform_driver(sun6i_csi_platform_driver);
> +
> +MODULE_DESCRIPTION("Allwinner V3s Camera Sensor Interface driver");
> +MODULE_AUTHOR("Yong Deng <yong.deng@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> new file mode 100644
> index 000000000000..44a7d50805bc
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> @@ -0,0 +1,145 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
> + * All rights reserved.
> + * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
> + */
> +
> +#ifndef __SUN6I_CSI_H__
> +#define __SUN6I_CSI_H__
> +
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> +
> +#include "sun6i_video.h"
> +
> +struct sun6i_csi;
> +
> +/**
> + * struct sun6i_csi_config - configs for sun6i csi
> + * @pixelformat: v4l2 pixel format (V4L2_PIX_FMT_*)
> + * @code: media bus format code (MEDIA_BUS_FMT_*)
> + * @field: used interlacing type (enum v4l2_field)
> + * @width: frame width
> + * @height: frame height
> + */
> +struct sun6i_csi_config {
> + u32 pixelformat;
> + u32 code;
> + u32 field;
> + u32 width;
> + u32 height;
> +};
> +
> +struct sun6i_csi {
> + struct device *dev;
> + struct v4l2_ctrl_handler ctrl_handler;
> + struct v4l2_device v4l2_dev;
> + struct media_device media_dev;
> +
> + struct v4l2_async_notifier notifier;
> +
> + /* video port settings */
> + struct v4l2_fwnode_endpoint v4l2_ep;
> +
> + struct sun6i_csi_config config;
> +
> + struct sun6i_video video;
> +};
> +
> +/**
> + * sun6i_csi_get_supported_pixformats() - get csi supported pixformats
> + * @csi: pointer to the csi
> + * @pixformats: supported pixformats return from csi
> + *
> + * @return the count of pixformats or error(< 0)
> + */
> +int sun6i_csi_get_supported_pixformats(struct sun6i_csi *csi,
> + const u32 **pixformats);
> +
> +/**
> + * sun6i_csi_is_format_supported() - check if the format supported by csi
> + * @csi: pointer to the csi
> + * @pixformat: v4l2 pixel format (V4L2_PIX_FMT_*)
> + * @mbus_code: media bus format code (MEDIA_BUS_FMT_*)
> + */
> +bool sun6i_csi_is_format_supported(struct sun6i_csi *csi, u32 pixformat,
> + u32 mbus_code);
> +
> +/**
> + * sun6i_csi_set_power() - power on/off the csi
> + * @csi: pointer to the csi
> + * @enable: on/off
> + */
> +int sun6i_csi_set_power(struct sun6i_csi *csi, bool enable);
> +
> +/**
> + * sun6i_csi_update_config() - update the csi register setttings
> + * @csi: pointer to the csi
> + * @config: see struct sun6i_csi_config
> + */
> +int sun6i_csi_update_config(struct sun6i_csi *csi,
> + struct sun6i_csi_config *config);
> +
> +/**
> + * sun6i_csi_update_buf_addr() - update the csi frame buffer address
> + * @csi: pointer to the csi
> + * @addr: frame buffer's physical address
> + */
> +void sun6i_csi_update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr);
> +
> +/**
> + * sun6i_csi_set_stream() - start/stop csi streaming
> + * @csi: pointer to the csi
> + * @enable: start/stop
> + */
> +void sun6i_csi_set_stream(struct sun6i_csi *csi, bool enable);
> +
> +/* get bpp form v4l2 pixformat */
> +static inline int sun6i_csi_get_bpp(unsigned int pixformat)
> +{
> + switch (pixformat) {
> + case V4L2_PIX_FMT_SBGGR8:
> + case V4L2_PIX_FMT_SGBRG8:
> + case V4L2_PIX_FMT_SGRBG8:
> + case V4L2_PIX_FMT_SRGGB8:
> + return 8;
> + case V4L2_PIX_FMT_SBGGR10:
> + case V4L2_PIX_FMT_SGBRG10:
> + case V4L2_PIX_FMT_SGRBG10:
> + case V4L2_PIX_FMT_SRGGB10:
> + return 10;
> + case V4L2_PIX_FMT_SBGGR12:
> + case V4L2_PIX_FMT_SGBRG12:
> + case V4L2_PIX_FMT_SGRBG12:
> + case V4L2_PIX_FMT_SRGGB12:
> + case V4L2_PIX_FMT_HM12:
> + case V4L2_PIX_FMT_NV12:
> + case V4L2_PIX_FMT_NV21:
> + case V4L2_PIX_FMT_YUV420:
> + case V4L2_PIX_FMT_YVU420:
> + return 12;
> + case V4L2_PIX_FMT_YUYV:
> + case V4L2_PIX_FMT_YVYU:
> + case V4L2_PIX_FMT_UYVY:
> + case V4L2_PIX_FMT_VYUY:
> + case V4L2_PIX_FMT_NV16:
> + case V4L2_PIX_FMT_NV61:
> + case V4L2_PIX_FMT_YUV422P:
> + return 16;
> + case V4L2_PIX_FMT_RGB24:
> + case V4L2_PIX_FMT_BGR24:
> + return 24;
> + case V4L2_PIX_FMT_RGB32:
> + case V4L2_PIX_FMT_BGR32:
> + return 32;
> + default:
> + WARN(1, "Unsupported pixformat: 0x%x\n", pixformat);
> + break;
> + }
> +
> + return 0;
> +}
> +
> +#endif /* __SUN6I_CSI_H__ */
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h
> new file mode 100644
> index 000000000000..00798b4d20f2
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_reg.h
> @@ -0,0 +1,196 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
> + * All rights reserved.
> + * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
> + */
> +
> +#ifndef __SUN6I_CSI_REG_H__
> +#define __SUN6I_CSI_REG_H__
> +
> +#include <linux/kernel.h>
> +
> +#define CSI_EN_REG 0x0
> +#define CSI_EN_VER_EN BIT(30)
> +#define CSI_EN_CSI_EN BIT(0)
> +
> +#define CSI_IF_CFG_REG 0x4
> +#define CSI_IF_CFG_SRC_TYPE_MASK BIT(21)
> +#define CSI_IF_CFG_SRC_TYPE_PROGRESSED ((0 << 21) & CSI_IF_CFG_SRC_TYPE_MASK)
> +#define CSI_IF_CFG_SRC_TYPE_INTERLACED ((1 << 21) & CSI_IF_CFG_SRC_TYPE_MASK)
> +#define CSI_IF_CFG_FPS_DS_EN BIT(20)
> +#define CSI_IF_CFG_FIELD_MASK BIT(19)
> +#define CSI_IF_CFG_FIELD_NEGATIVE ((0 << 19) & CSI_IF_CFG_FIELD_MASK)
> +#define CSI_IF_CFG_FIELD_POSITIVE ((1 << 19) & CSI_IF_CFG_FIELD_MASK)
> +#define CSI_IF_CFG_VREF_POL_MASK BIT(18)
> +#define CSI_IF_CFG_VREF_POL_NEGATIVE ((0 << 18) & CSI_IF_CFG_VREF_POL_MASK)
> +#define CSI_IF_CFG_VREF_POL_POSITIVE ((1 << 18) & CSI_IF_CFG_VREF_POL_MASK)
> +#define CSI_IF_CFG_HREF_POL_MASK BIT(17)
> +#define CSI_IF_CFG_HREF_POL_NEGATIVE ((0 << 17) & CSI_IF_CFG_HREF_POL_MASK)
> +#define CSI_IF_CFG_HREF_POL_POSITIVE ((1 << 17) & CSI_IF_CFG_HREF_POL_MASK)
> +#define CSI_IF_CFG_CLK_POL_MASK BIT(16)
> +#define CSI_IF_CFG_CLK_POL_RISING_EDGE ((0 << 16) & CSI_IF_CFG_CLK_POL_MASK)
> +#define CSI_IF_CFG_CLK_POL_FALLING_EDGE ((1 << 16) & CSI_IF_CFG_CLK_POL_MASK)
> +#define CSI_IF_CFG_IF_DATA_WIDTH_MASK GENMASK(10, 8)
> +#define CSI_IF_CFG_IF_DATA_WIDTH_8BIT ((0 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
> +#define CSI_IF_CFG_IF_DATA_WIDTH_10BIT ((1 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
> +#define CSI_IF_CFG_IF_DATA_WIDTH_12BIT ((2 << 8) & CSI_IF_CFG_IF_DATA_WIDTH_MASK)
> +#define CSI_IF_CFG_MIPI_IF_MASK BIT(7)
> +#define CSI_IF_CFG_MIPI_IF_CSI (0 << 7)
> +#define CSI_IF_CFG_MIPI_IF_MIPI (1 << 7)
> +#define CSI_IF_CFG_CSI_IF_MASK GENMASK(4, 0)
> +#define CSI_IF_CFG_CSI_IF_YUV422_INTLV ((0 << 0) & CSI_IF_CFG_CSI_IF_MASK)
> +#define CSI_IF_CFG_CSI_IF_YUV422_16BIT ((1 << 0) & CSI_IF_CFG_CSI_IF_MASK)
> +#define CSI_IF_CFG_CSI_IF_BT656 ((4 << 0) & CSI_IF_CFG_CSI_IF_MASK)
> +#define CSI_IF_CFG_CSI_IF_BT1120 ((5 << 0) & CSI_IF_CFG_CSI_IF_MASK)
> +
> +#define CSI_CAP_REG 0x8
> +#define CSI_CAP_CH0_CAP_MASK_MASK GENMASK(5, 2)
> +#define CSI_CAP_CH0_CAP_MASK(count) ((count << 2) & CSI_CAP_CH0_CAP_MASK_MASK)
> +#define CSI_CAP_CH0_VCAP_ON BIT(1)
> +#define CSI_CAP_CH0_SCAP_ON BIT(0)
> +
> +#define CSI_SYNC_CNT_REG 0xc
> +#define CSI_FIFO_THRS_REG 0x10
> +#define CSI_BT656_HEAD_CFG_REG 0x14
> +#define CSI_PTN_LEN_REG 0x30
> +#define CSI_PTN_ADDR_REG 0x34
> +#define CSI_VER_REG 0x3c
> +
> +#define CSI_CH_CFG_REG 0x44
> +#define CSI_CH_CFG_INPUT_FMT_MASK GENMASK(23, 20)
> +#define CSI_CH_CFG_INPUT_FMT(fmt) ((fmt << 20) & CSI_CH_CFG_INPUT_FMT_MASK)
> +#define CSI_CH_CFG_OUTPUT_FMT_MASK GENMASK(19, 16)
> +#define CSI_CH_CFG_OUTPUT_FMT(fmt) ((fmt << 16) & CSI_CH_CFG_OUTPUT_FMT_MASK)
> +#define CSI_CH_CFG_VFLIP_EN BIT(13)
> +#define CSI_CH_CFG_HFLIP_EN BIT(12)
> +#define CSI_CH_CFG_FIELD_SEL_MASK GENMASK(11, 10)
> +#define CSI_CH_CFG_FIELD_SEL_FIELD0 ((0 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
> +#define CSI_CH_CFG_FIELD_SEL_FIELD1 ((1 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
> +#define CSI_CH_CFG_FIELD_SEL_BOTH ((2 << 10) & CSI_CH_CFG_FIELD_SEL_MASK)
> +#define CSI_CH_CFG_INPUT_SEQ_MASK GENMASK(9, 8)
> +#define CSI_CH_CFG_INPUT_SEQ(seq) ((seq << 8) & CSI_CH_CFG_INPUT_SEQ_MASK)
> +
> +#define CSI_CH_SCALE_REG 0x4c
> +#define CSI_CH_SCALE_QUART_EN BIT(0)
> +
> +#define CSI_CH_F0_BUFA_REG 0x50
> +
> +#define CSI_CH_F1_BUFA_REG 0x58
> +
> +#define CSI_CH_F2_BUFA_REG 0x60
> +
> +#define CSI_CH_STA_REG 0x6c
> +#define CSI_CH_STA_FIELD_STA_MASK BIT(2)
> +#define CSI_CH_STA_FIELD_STA_FIELD0 ((0 << 2) & CSI_CH_STA_FIELD_STA_MASK)
> +#define CSI_CH_STA_FIELD_STA_FIELD1 ((1 << 2) & CSI_CH_STA_FIELD_STA_MASK)
> +#define CSI_CH_STA_VCAP_STA BIT(1)
> +#define CSI_CH_STA_SCAP_STA BIT(0)
> +
> +#define CSI_CH_INT_EN_REG 0x70
> +#define CSI_CH_INT_EN_VS_INT_EN BIT(7)
> +#define CSI_CH_INT_EN_HB_OF_INT_EN BIT(6)
> +#define CSI_CH_INT_EN_MUL_ERR_INT_EN BIT(5)
> +#define CSI_CH_INT_EN_FIFO2_OF_INT_EN BIT(4)
> +#define CSI_CH_INT_EN_FIFO1_OF_INT_EN BIT(3)
> +#define CSI_CH_INT_EN_FIFO0_OF_INT_EN BIT(2)
> +#define CSI_CH_INT_EN_FD_INT_EN BIT(1)
> +#define CSI_CH_INT_EN_CD_INT_EN BIT(0)
> +
> +#define CSI_CH_INT_STA_REG 0x74
> +#define CSI_CH_INT_STA_VS_PD BIT(7)
> +#define CSI_CH_INT_STA_HB_OF_PD BIT(6)
> +#define CSI_CH_INT_STA_MUL_ERR_PD BIT(5)
> +#define CSI_CH_INT_STA_FIFO2_OF_PD BIT(4)
> +#define CSI_CH_INT_STA_FIFO1_OF_PD BIT(3)
> +#define CSI_CH_INT_STA_FIFO0_OF_PD BIT(2)
> +#define CSI_CH_INT_STA_FD_PD BIT(1)
> +#define CSI_CH_INT_STA_CD_PD BIT(0)
> +
> +#define CSI_CH_FLD1_VSIZE_REG 0x78
> +
> +#define CSI_CH_HSIZE_REG 0x80
> +#define CSI_CH_HSIZE_HOR_LEN_MASK GENMASK(28, 16)
> +#define CSI_CH_HSIZE_HOR_LEN(len) ((len << 16) & CSI_CH_HSIZE_HOR_LEN_MASK)
> +#define CSI_CH_HSIZE_HOR_START_MASK GENMASK(12, 0)
> +#define CSI_CH_HSIZE_HOR_START(start) ((start << 0) & CSI_CH_HSIZE_HOR_START_MASK)
> +
> +#define CSI_CH_VSIZE_REG 0x84
> +#define CSI_CH_VSIZE_VER_LEN_MASK GENMASK(28, 16)
> +#define CSI_CH_VSIZE_VER_LEN(len) ((len << 16) & CSI_CH_VSIZE_VER_LEN_MASK)
> +#define CSI_CH_VSIZE_VER_START_MASK GENMASK(12, 0)
> +#define CSI_CH_VSIZE_VER_START(start) ((start << 0) & CSI_CH_VSIZE_VER_START_MASK)
> +
> +#define CSI_CH_BUF_LEN_REG 0x88
> +#define CSI_CH_BUF_LEN_BUF_LEN_C_MASK GENMASK(29, 16)
> +#define CSI_CH_BUF_LEN_BUF_LEN_C(len) ((len << 16) & CSI_CH_BUF_LEN_BUF_LEN_C_MASK)
> +#define CSI_CH_BUF_LEN_BUF_LEN_Y_MASK GENMASK(13, 0)
> +#define CSI_CH_BUF_LEN_BUF_LEN_Y(len) ((len << 0) & CSI_CH_BUF_LEN_BUF_LEN_Y_MASK)
> +
> +#define CSI_CH_FLIP_SIZE_REG 0x8c
> +#define CSI_CH_FLIP_SIZE_VER_LEN_MASK GENMASK(28, 16)
> +#define CSI_CH_FLIP_SIZE_VER_LEN(len) ((len << 16) & CSI_CH_FLIP_SIZE_VER_LEN_MASK)
> +#define CSI_CH_FLIP_SIZE_VALID_LEN_MASK GENMASK(12, 0)
> +#define CSI_CH_FLIP_SIZE_VALID_LEN(len) ((len << 0) & CSI_CH_FLIP_SIZE_VALID_LEN_MASK)
> +
> +#define CSI_CH_FRM_CLK_CNT_REG 0x90
> +#define CSI_CH_ACC_ITNL_CLK_CNT_REG 0x94
> +#define CSI_CH_FIFO_STAT_REG 0x98
> +#define CSI_CH_PCLK_STAT_REG 0x9c
> +
> +/*
> + * csi input data format
> + */
> +enum csi_input_fmt {
> + CSI_INPUT_FORMAT_RAW = 0,
> + CSI_INPUT_FORMAT_YUV422 = 3,
> + CSI_INPUT_FORMAT_YUV420 = 4,
> +};
> +
> +/*
> + * csi output data format
> + */
> +enum csi_output_fmt {
> + /* only when input format is RAW */
> + CSI_FIELD_RAW_8 = 0,
> + CSI_FIELD_RAW_10 = 1,
> + CSI_FIELD_RAW_12 = 2,
> + CSI_FIELD_RGB565 = 4,
> + CSI_FIELD_RGB888 = 5,
> + CSI_FIELD_PRGB888 = 6,
> + CSI_FRAME_RAW_8 = 8,
> + CSI_FRAME_RAW_10 = 9,
> + CSI_FRAME_RAW_12 = 10,
> + CSI_FRAME_RGB565 = 12,
> + CSI_FRAME_RGB888 = 13,
> + CSI_FRAME_PRGB888 = 14,
> +
> + /* only when input format is YUV422 */
> + CSI_FIELD_PLANAR_YUV422 = 0,
> + CSI_FIELD_PLANAR_YUV420 = 1,
> + CSI_FRAME_PLANAR_YUV420 = 2,
> + CSI_FRAME_PLANAR_YUV422 = 3,
> + CSI_FIELD_UV_CB_YUV422 = 4,
> + CSI_FIELD_UV_CB_YUV420 = 5,
> + CSI_FRAME_UV_CB_YUV420 = 6,
> + CSI_FRAME_UV_CB_YUV422 = 7,
> + CSI_FIELD_MB_YUV422 = 8,
> + CSI_FIELD_MB_YUV420 = 9,
> + CSI_FRAME_MB_YUV420 = 10,
> + CSI_FRAME_MB_YUV422 = 11,
> + CSI_FIELD_UV_CB_YUV422_10 = 12,
> + CSI_FIELD_UV_CB_YUV420_10 = 13,
> +};
> +
> +/*
> + * csi YUV input data sequence
> + */
> +enum csi_input_seq {
> + /* only when input format is YUV422 */
> + CSI_INPUT_SEQ_YUYV = 0,
> + CSI_INPUT_SEQ_YVYU,
> + CSI_INPUT_SEQ_UYVY,
> + CSI_INPUT_SEQ_VYUY,
> +};
> +
> +#endif /* __SUN6I_CSI_REG_H__ */
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> new file mode 100644
> index 000000000000..9bd662b08236
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
> @@ -0,0 +1,767 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
> + * All rights reserved.
> + * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
> + */
> +
> +#include <linux/of.h>
> +
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mc.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/videobuf2-v4l2.h>
> +
> +#include "sun6i_csi.h"
> +#include "sun6i_video.h"
> +
> +struct sun6i_csi_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head list;
> +
> + dma_addr_t dma_addr;
> + bool queued_to_csi;
> +};
> +
> +static struct sun6i_csi_format *
> +find_format_by_pixformat(struct sun6i_video *video, unsigned int pixformat)
> +{
> + unsigned int num_formats = video->num_formats;
> + struct sun6i_csi_format *fmt;
> + unsigned int i;
> +
> + for (i = 0; i < num_formats; i++) {
> + fmt = &video->formats[i];
> + if (fmt->pixformat == pixformat)
> + return fmt;
> + }
> +
> + return NULL;
> +}
> +
> +static struct v4l2_subdev *
> +sun6i_video_remote_subdev(struct sun6i_video *video, u32 *pad)
> +{
> + struct media_pad *remote;
> +
> + remote = media_entity_remote_pad(&video->pad);
> +
> + if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
> + return NULL;
> +
> + if (pad)
> + *pad = remote->index;
> +
> + return media_entity_to_v4l2_subdev(remote->entity);

If you changed this to return the pad instead of the subdev, you could omit
the pad argument. Up to you.

> +}
> +
> +static int sun6i_video_queue_setup(struct vb2_queue *vq,
> + unsigned int *nbuffers, unsigned int *nplanes,
> + unsigned int sizes[],
> + struct device *alloc_devs[])
> +{
> + struct sun6i_video *video = vb2_get_drv_priv(vq);
> + unsigned int size = video->fmt.fmt.pix.sizeimage;
> +
> + if (*nplanes)
> + return sizes[0] < size ? -EINVAL : 0;
> +
> + *nplanes = 1;
> + sizes[0] = size;
> +
> + return 0;
> +}
> +
> +static int sun6i_video_buffer_prepare(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct sun6i_csi_buffer *buf =
> + container_of(vbuf, struct sun6i_csi_buffer, vb);
> + struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long size = video->fmt.fmt.pix.sizeimage;
> +
> + if (vb2_plane_size(vb, 0) < size) {
> + v4l2_err(video->vdev.v4l2_dev, "buffer too small (%lu < %lu)\n",
> + vb2_plane_size(vb, 0), size);
> + return -EINVAL;
> + }
> +
> + vb2_set_plane_payload(vb, 0, size);
> +
> + buf->dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
> +
> + vbuf->field = video->fmt.fmt.pix.field;
> +
> + return 0;
> +}
> +
> +static int sun6i_pipeline_set_stream(struct sun6i_video *video, bool enable)
> +{
> + struct media_entity *entity;
> + struct media_pad *pad;
> + struct v4l2_subdev *subdev;
> + int ret;
> +
> + entity = &video->vdev.entity;
> + while (1) {
> + pad = &entity->pads[0];
> + if (!(pad->flags & MEDIA_PAD_FL_SINK))
> + break;
> +
> + pad = media_entity_remote_pad(pad);
> + if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
> + break;
> +
> + entity = pad->entity;
> + subdev = media_entity_to_v4l2_subdev(entity);
> +
> + ret = v4l2_subdev_call(subdev, video, s_stream, enable);
> + if (enable && ret < 0 && ret != -ENOIOCTLCMD)
> + return ret;

You'll need to end the loop when you encounter the first sub-device which
is not controlled by this driver. The order in which other drivers control
streaming on their upstream sub-devices is specific to that driver (and is
not known here).

> + }
> +
> + return 0;
> +}
> +
> +static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
> +{
> + struct sun6i_video *video = vb2_get_drv_priv(vq);
> + struct sun6i_csi_buffer *buf;
> + struct sun6i_csi_buffer *next_buf;
> + struct sun6i_csi_config config;
> + unsigned long flags;
> + int ret;
> +
> + video->sequence = 0;
> +
> + if (!video->current_fmt)
> + return -ENXIO;
> +
> + ret = media_pipeline_start(&video->vdev.entity, &video->vdev.pipe);
> + if (ret < 0)
> + goto clear_dma_queue;
> +
> + config.pixelformat = video->fmt.fmt.pix.pixelformat;
> + config.code = video->current_fmt->mbus_code;
> + config.field = video->fmt.fmt.pix.field;
> + config.width = video->fmt.fmt.pix.width;
> + config.height = video->fmt.fmt.pix.height;
> +
> + ret = sun6i_csi_update_config(video->csi, &config);
> + if (ret < 0)
> + goto stop_media_pipeline;
> +
> + spin_lock_irqsave(&video->dma_queue_lock, flags);
> +
> + buf = list_first_entry(&video->dma_queue,
> + struct sun6i_csi_buffer, list);
> + buf->queued_to_csi = true;
> + sun6i_csi_update_buf_addr(video->csi, buf->dma_addr);
> +
> + sun6i_csi_set_stream(video->csi, true);
> +
> + /*
> + * CSI will lookup the next dma buffer for next frame before the
> + * the current frame done IRQ triggered. This is not documented
> + * but reported by OndÅej Jirman.
> + * The BSP code has workaround for this too. It skip to mark the
> + * first buffer as frame done for VB2 and pass the second buffer
> + * to CSI in the first frame done ISR call. Then in second frame
> + * done ISR call, it mark the first buffer as frame done for VB2
> + * and pass the third buffer to CSI. And so on. The bad thing is
> + * that the first buffer will be written twice and the first frame
> + * is dropped even the queued buffer is sufficient.
> + * So, I make some improvement here. Pass the next buffer to CSI
> + * just follow starting the CSI. In this case, the first frame
> + * will be stored in first buffer, second frame in second buffer.
> + * This method is used to avoid dropping the first frame, it
> + * would also drop frame when lacking of queued buffer.
> + */
> + next_buf = list_next_entry(buf, list);
> + next_buf->queued_to_csi = true;
> + sun6i_csi_update_buf_addr(video->csi, next_buf->dma_addr);
> +
> + spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +
> + ret = sun6i_pipeline_set_stream(video, true);
> + if (ret < 0)
> + goto stop_csi_stream;
> +
> + return 0;
> +
> +stop_csi_stream:
> + sun6i_csi_set_stream(video->csi, false);
> +stop_media_pipeline:
> + media_pipeline_stop(&video->vdev.entity);
> +clear_dma_queue:
> + spin_lock_irqsave(&video->dma_queue_lock, flags);
> + list_for_each_entry(buf, &video->dma_queue, list)
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> + INIT_LIST_HEAD(&video->dma_queue);
> + spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +
> + return ret;
> +}
> +
> +static void sun6i_video_stop_streaming(struct vb2_queue *vq)
> +{
> + struct sun6i_video *video = vb2_get_drv_priv(vq);
> + unsigned long flags;
> + struct sun6i_csi_buffer *buf;
> +
> + sun6i_pipeline_set_stream(video, false);
> +
> + sun6i_csi_set_stream(video->csi, false);
> +
> + media_pipeline_stop(&video->vdev.entity);
> +
> + /* Release all active buffers */
> + spin_lock_irqsave(&video->dma_queue_lock, flags);
> + list_for_each_entry(buf, &video->dma_queue, list)
> + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
> + INIT_LIST_HEAD(&video->dma_queue);
> + spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +}
> +
> +static void sun6i_video_buffer_queue(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct sun6i_csi_buffer *buf =
> + container_of(vbuf, struct sun6i_csi_buffer, vb);
> + struct sun6i_video *video = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&video->dma_queue_lock, flags);
> + buf->queued_to_csi = false;
> + list_add_tail(&buf->list, &video->dma_queue);
> + spin_unlock_irqrestore(&video->dma_queue_lock, flags);
> +}
> +
> +void sun6i_video_frame_done(struct sun6i_video *video)
> +{
> + struct sun6i_csi_buffer *buf;
> + struct sun6i_csi_buffer *next_buf;
> + struct vb2_v4l2_buffer *vbuf;
> +
> + spin_lock(&video->dma_queue_lock);

I'm not sure I'd rely on interrupts being disabled here. How about
spin_lock_irqsave()?

> +
> + buf = list_first_entry(&video->dma_queue,
> + struct sun6i_csi_buffer, list);
> + if (list_is_last(&buf->list, &video->dma_queue)) {
> + dev_dbg(video->csi->dev, "Frame droped!\n");
> + goto unlock;
> + }
> +
> + next_buf = list_next_entry(buf, list);
> + /* If a new buffer (#next_buf) had not been queued to CSI, the old
> + * buffer (#buf) is still holding by CSI for storing the next
> + * frame. So, we queue a new buffer (#next_buf) to CSI then wait
> + * for next ISR call.
> + */
> + if (!next_buf->queued_to_csi) {
> + next_buf->queued_to_csi = true;
> + sun6i_csi_update_buf_addr(video->csi, next_buf->dma_addr);
> + dev_dbg(video->csi->dev, "Frame droped!\n");
> + goto unlock;
> + }
> +
> + list_del(&buf->list);
> + vbuf = &buf->vb;
> + vbuf->vb2_buf.timestamp = ktime_get_ns();
> + vbuf->sequence = video->sequence;
> + vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
> +
> + /* Prepare buffer for next frame but one. */
> + if (!list_is_last(&next_buf->list, &video->dma_queue)) {
> + next_buf = list_next_entry(next_buf, list);
> + next_buf->queued_to_csi = true;
> + sun6i_csi_update_buf_addr(video->csi, next_buf->dma_addr);
> + } else {
> + dev_dbg(video->csi->dev, "Next frame will be dropped!\n");
> + }
> +
> +unlock:
> + video->sequence++;
> + spin_unlock(&video->dma_queue_lock);
> +}
> +
> +static const struct vb2_ops sun6i_csi_vb2_ops = {
> + .queue_setup = sun6i_video_queue_setup,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> + .buf_prepare = sun6i_video_buffer_prepare,
> + .start_streaming = sun6i_video_start_streaming,
> + .stop_streaming = sun6i_video_stop_streaming,
> + .buf_queue = sun6i_video_buffer_queue,
> +};
> +
> +static int vidioc_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> +
> + strlcpy(cap->driver, "sun6i-video", sizeof(cap->driver));
> + strlcpy(cap->card, video->vdev.name, sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + video->csi->dev->of_node->name);
> +
> + return 0;
> +}
> +
> +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> + u32 index = f->index;
> +
> + if (index >= video->num_formats)
> + return -EINVAL;
> +
> + f->pixelformat = video->formats[index].pixformat;
> +
> + return 0;
> +}
> +
> +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> +
> + *fmt = video->fmt;
> +
> + return 0;
> +}
> +
> +
> +static int sun6i_video_try_fmt_source(struct sun6i_video *video,
> + u32 which,
> + struct v4l2_pix_format *pixfmt,
> + struct sun6i_csi_format *csi_fmt)
> +{
> + struct v4l2_subdev *subdev;
> + struct v4l2_subdev_pad_config *pad_cfg;
> + struct v4l2_subdev_format format = {
> + .which = which,
> + };
> + u32 pad;
> + int ret;
> +
> + subdev = sun6i_video_remote_subdev(video, &pad);
> + if (subdev == NULL)
> + return -ENXIO;
> +
> + v4l2_fill_mbus_format(&format.format, pixfmt, csi_fmt->mbus_code);
> +
> + pad_cfg = v4l2_subdev_alloc_pad_config(subdev);
> + if (pad_cfg == NULL)
> + return -ENOMEM;
> +
> + format.pad = pad;
> + ret = v4l2_subdev_call(subdev, pad, set_fmt, pad_cfg, &format);
> + if (ret)
> + goto done;

If the driver exposes format configuration through the V4L2 sub-device API,
trying the format on the video node should limit to the DMA engine only.
I.e. what the upstream sub-device can (or cannot) do is not relevant here.

The pipeline there may well be longer than just an image sensor
represented by just a single sub-device.

> +
> + v4l2_fill_pix_format(pixfmt, &format.format);
> +
> +done:
> + v4l2_subdev_free_pad_config(pad_cfg);
> + return ret;
> +}
> +
> +static int sun6i_video_try_fmt(struct sun6i_video *video, u32 which,
> + struct v4l2_format *f,
> + struct sun6i_csi_format **current_fmt)
> +{
> + struct sun6i_csi_format *csi_fmt;
> + struct v4l2_pix_format *pixfmt = &f->fmt.pix;
> + int ret;
> +
> + csi_fmt = find_format_by_pixformat(video, pixfmt->pixelformat);
> + if (csi_fmt == NULL) {
> + if (video->num_formats > 0) {
> + csi_fmt = &video->formats[0];
> + pixfmt->pixelformat = csi_fmt->pixformat;
> + } else
> + return -EINVAL;
> + }
> +
> + ret = sun6i_video_try_fmt_source(video, which, pixfmt, csi_fmt);
> + if (ret)
> + return ret;
> +
> + pixfmt->bytesperline = (pixfmt->width * csi_fmt->bpp) >> 3;
> + pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
> +
> + if (current_fmt)
> + *current_fmt = csi_fmt;
> +
> + return 0;
> +}
> +
> +static int sun6i_video_set_fmt(struct sun6i_video *video, struct v4l2_format *f)
> +{
> + struct sun6i_csi_format *current_fmt;
> + int ret;
> +
> + ret = sun6i_video_try_fmt(video, V4L2_SUBDEV_FORMAT_ACTIVE, f,
> + &current_fmt);
> + if (ret)
> + return ret;
> +
> + video->fmt = *f;
> + video->current_fmt = current_fmt;
> +
> + return 0;
> +}
> +
> +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> +
> + if (vb2_is_busy(&video->vb2_vidq))
> + return -EBUSY;
> +
> + return sun6i_video_set_fmt(video, f);
> +}
> +
> +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> +
> + return sun6i_video_try_fmt(video, V4L2_SUBDEV_FORMAT_TRY, f, NULL);
> +}
> +
> +static int vidioc_enum_input(struct file *file, void *fh,
> + struct v4l2_input *inp)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> + struct v4l2_subdev *subdev;
> + u32 pad;
> + int ret;
> +
> + if (inp->index != 0)
> + return -EINVAL;
> +
> + subdev = sun6i_video_remote_subdev(video, &pad);
> + if (subdev == NULL)
> + return -ENXIO;
> +
> + ret = v4l2_subdev_call(subdev, video, g_input_status, &inp->status);

What's the intent here? Below, g_input and s_input both support zero only
(i.e. whatever is connected).

> + if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
> + return ret;
> +
> + inp->type = 0;
> +
> + inp->capabilities = 0;
> + inp->std = 0;
> + if (v4l2_subdev_has_op(subdev, pad, dv_timings_cap))
> + inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
> +
> + strlcpy(inp->name, subdev->name, sizeof(inp->name));
> +
> + return 0;
> +}
> +
> +static int vidioc_g_input(struct file *file, void *fh, unsigned int *i)
> +{
> + *i = 0;
> +
> + return 0;
> +}
> +
> +static int vidioc_s_input(struct file *file, void *fh, unsigned int i)
> +{
> + if (i != 0)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
> + .vidioc_querycap = vidioc_querycap,
> + .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
> + .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
> +
> + .vidioc_enum_input = vidioc_enum_input,
> + .vidioc_s_input = vidioc_s_input,
> + .vidioc_g_input = vidioc_g_input,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_log_status = v4l2_ctrl_log_status,
> + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * V4L2 file operations
> + */
> +static int sun6i_video_open(struct file *file)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> + int ret;
> +
> + if (mutex_lock_interruptible(&video->lock))
> + return -ERESTARTSYS;
> +
> + ret = v4l2_fh_open(file);
> + if (ret < 0)
> + goto unlock;
> +
> + ret = v4l2_pipeline_pm_use(&video->vdev.entity, 1);
> + if (ret < 0)
> + goto fh_release;
> +
> + /* check if already powered */
> + if (!v4l2_fh_is_singular_file(file))
> + goto unlock;
> +
> + ret = sun6i_csi_set_power(video->csi, true);
> + if (ret < 0)
> + goto fh_release;
> +
> + mutex_unlock(&video->lock);
> + return 0;
> +
> +fh_release:
> + v4l2_fh_release(file);
> +unlock:
> + mutex_unlock(&video->lock);
> + return ret;
> +}
> +
> +static int sun6i_video_close(struct file *file)
> +{
> + struct sun6i_video *video = video_drvdata(file);
> + bool last_fh;
> +
> + mutex_lock(&video->lock);
> +
> + last_fh = v4l2_fh_is_singular_file(file);
> +
> + _vb2_fop_release(file, NULL);
> +
> + v4l2_pipeline_pm_use(&video->vdev.entity, 0);
> +
> + if (last_fh)
> + sun6i_csi_set_power(video->csi, false);
> +
> + mutex_unlock(&video->lock);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_file_operations sun6i_video_fops = {
> + .owner = THIS_MODULE,
> + .open = sun6i_video_open,
> + .release = sun6i_video_close,
> + .unlocked_ioctl = video_ioctl2,
> + .mmap = vb2_fop_mmap,
> + .poll = vb2_fop_poll
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Media Operations
> + */
> +static int sun6i_video_formats_init(struct sun6i_video *video,
> + const struct media_pad *remote)
> +{
> + struct v4l2_subdev_mbus_code_enum mbus_code = { 0 };
> + struct sun6i_csi *csi = video->csi;
> + struct v4l2_format format;
> + struct v4l2_subdev *subdev;
> + u32 pad;
> + const u32 *pixformats;
> + int pixformat_count = 0;
> + u32 subdev_codes[32]; /* subdev format codes, 32 should be enough */
> + int codes_count = 0;
> + int num_fmts = 0;
> + int i, j;
> +
> + pad = remote->index;
> + subdev = media_entity_to_v4l2_subdev(remote->entity);
> + if (subdev == NULL)
> + return -ENXIO;
> +
> + /* Get supported pixformats of CSI */
> + pixformat_count = sun6i_csi_get_supported_pixformats(csi, &pixformats);
> + if (pixformat_count <= 0)
> + return -ENXIO;
> +
> + /* Get subdev formats codes */
> + mbus_code.pad = pad;
> + mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> + while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL,
> + &mbus_code)) {

The formats supported by the external sub-device may depend on horizontal
and vertical flipping. You shouldn't assume any particular configuration
here: instead, bridge drivers generally just need to make sure the formats
match in link validation when streaming is started. At least the CSI-2
receiver driver and the DMA engine driver (video device) should check the
configuration is valid. See e.g. the IPU3 driver:
drivers/media/pci/intel/ipu3/ipu3-cio2.c .

> + if (codes_count >= ARRAY_SIZE(subdev_codes)) {
> + dev_warn(video->csi->dev,
> + "subdev_codes array is full!\n");
> + break;
> + }
> + subdev_codes[codes_count] = mbus_code.code;
> + codes_count++;
> + mbus_code.index++;
> + }
> +
> + if (!codes_count)
> + return -ENXIO;
> +
> + /* Get supported formats count */
> + for (i = 0; i < codes_count; i++) {
> + for (j = 0; j < pixformat_count; j++) {
> + if (!sun6i_csi_is_format_supported(csi, pixformats[j],
> + subdev_codes[i])) {
> + continue;
> + }
> + num_fmts++;
> + }
> + }
> +
> + if (!num_fmts)
> + return -ENXIO;
> +
> + video->num_formats = num_fmts;
> + video->formats = devm_kcalloc(video->csi->dev, num_fmts,
> + sizeof(struct sun6i_csi_format), GFP_KERNEL);
> + if (!video->formats)
> + return -ENOMEM;
> +
> + /* Get supported formats */
> + num_fmts = 0;
> + for (i = 0; i < codes_count; i++) {
> + for (j = 0; j < pixformat_count; j++) {
> + if (!sun6i_csi_is_format_supported(csi, pixformats[j],
> + subdev_codes[i])) {
> + continue;
> + }
> +
> + video->formats[num_fmts].pixformat = pixformats[j];
> + video->formats[num_fmts].mbus_code = subdev_codes[i];
> + video->formats[num_fmts].bpp =
> + sun6i_csi_get_bpp(pixformats[j]);
> + num_fmts++;
> + }
> + }
> +
> + /* setup default format */
> + format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + format.fmt.pix.width = 1280;
> + format.fmt.pix.height = 720;
> + format.fmt.pix.pixelformat = video->formats[0].pixformat;
> + sun6i_video_set_fmt(video, &format);
> +
> + return 0;
> +}
> +
> +static int sun6i_video_link_setup(struct media_entity *entity,
> + const struct media_pad *local,
> + const struct media_pad *remote, u32 flags)
> +{
> + struct video_device *vdev = media_entity_to_video_device(entity);
> + struct sun6i_video *video = video_get_drvdata(vdev);
> +
> + if (WARN_ON(video == NULL))
> + return 0;
> +
> + if ((flags & MEDIA_LNK_FL_ENABLED) == 0)
> + return 0;
> +
> + return sun6i_video_formats_init(video, remote);
> +}
> +
> +static const struct media_entity_operations sun6i_video_media_ops = {
> + .link_setup = sun6i_video_link_setup,
> +};
> +
> +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> + const char *name)
> +{
> + struct video_device *vdev = &video->vdev;
> + struct vb2_queue *vidq = &video->vb2_vidq;
> + int ret;
> +
> + video->csi = csi;
> +
> + /* Initialize the media entity... */
> + video->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
> + vdev->entity.ops = &sun6i_video_media_ops;
> + ret = media_entity_pads_init(&vdev->entity, 1, &video->pad);
> + if (ret < 0)
> + return ret;
> +
> + mutex_init(&video->lock);
> +
> + INIT_LIST_HEAD(&video->dma_queue);
> + spin_lock_init(&video->dma_queue_lock);
> +
> + video->sequence = 0;
> + video->num_formats = 0;
> +
> + /* Initialize videobuf2 queue */
> + vidq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + vidq->io_modes = VB2_MMAP | VB2_DMABUF;
> + vidq->drv_priv = video;
> + vidq->buf_struct_size = sizeof(struct sun6i_csi_buffer);
> + vidq->ops = &sun6i_csi_vb2_ops;
> + vidq->mem_ops = &vb2_dma_contig_memops;
> + vidq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + vidq->lock = &video->lock;
> + /* Make sure non-dropped frame */
> + vidq->min_buffers_needed = 3;
> + vidq->dev = csi->dev;
> +
> + ret = vb2_queue_init(vidq);
> + if (ret) {
> + v4l2_err(&csi->v4l2_dev, "vb2_queue_init failed: %d\n", ret);
> + goto error;
> + }
> +
> + /* Register video device */
> + strlcpy(vdev->name, name, sizeof(vdev->name));
> + vdev->release = video_device_release_empty;
> + vdev->fops = &sun6i_video_fops;
> + vdev->ioctl_ops = &sun6i_video_ioctl_ops;
> + vdev->vfl_type = VFL_TYPE_GRABBER;
> + vdev->vfl_dir = VFL_DIR_RX;
> + vdev->v4l2_dev = &csi->v4l2_dev;
> + vdev->queue = vidq;
> + vdev->lock = &video->lock;
> + vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> + video_set_drvdata(vdev, video);
> +
> + ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> + if (ret < 0) {
> + v4l2_err(&csi->v4l2_dev,
> + "video_register_device failed: %d\n", ret);
> + goto error;
> + }
> +
> + return 0;
> +
> +error:
> + sun6i_video_cleanup(video);
> + return ret;
> +}
> +
> +void sun6i_video_cleanup(struct sun6i_video *video)
> +{
> + if (video_is_registered(&video->vdev))
> + video_unregister_device(&video->vdev);
> +
> + media_entity_cleanup(&video->vdev.entity);
> +}
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.h b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.h
> new file mode 100644
> index 000000000000..2301f184c986
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.h
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2011-2018 Magewell Electronics Co., Ltd. (Nanjing)
> + * All rights reserved.
> + * Author: Yong Deng <yong.deng@xxxxxxxxxxxx>
> + */
> +
> +#ifndef __SUN6I_VIDEO_H__
> +#define __SUN6I_VIDEO_H__
> +
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf2-core.h>
> +
> +/*
> + * struct sun6i_csi_format - CSI media bus format information
> + * @pixformat: V4l2 pixformat for this format
> + * @mbus_code: V4L2 media bus format code.
> + * @bpp: Bytes per pixel (when stored in memory)
> + */
> +struct sun6i_csi_format {
> + u32 pixformat;
> + u32 mbus_code;
> + u8 bpp;
> +};
> +
> +struct sun6i_csi;
> +
> +struct sun6i_video {
> + struct video_device vdev;
> + struct media_pad pad;
> + struct sun6i_csi *csi;
> +
> + struct mutex lock;
> +
> + struct vb2_queue vb2_vidq;
> + spinlock_t dma_queue_lock;
> + struct list_head dma_queue;
> +
> + unsigned int sequence;
> +
> + struct sun6i_csi_format *formats;
> + unsigned int num_formats;
> + struct sun6i_csi_format *current_fmt;
> + struct v4l2_format fmt;
> +};
> +
> +int sun6i_video_init(struct sun6i_video *video, struct sun6i_csi *csi,
> + const char *name);
> +void sun6i_video_cleanup(struct sun6i_video *video);
> +
> +void sun6i_video_frame_done(struct sun6i_video *video);
> +
> +#endif /* __SUN6I_VIDEO_H__ */

--
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@xxxxxx