RE: [PATCH v2 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem driver

From: Vishal Sagar
Date: Wed Jan 30 2019 - 02:16:39 EST

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In reply to: Hyun Kwon: "Re: [PATCH v2 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem driver"
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Hi Hyun,

> -----Original Message-----
> From: Hyun Kwon [mailto:hyun.kwon@xxxxxxxxxx]
> Sent: Tuesday, January 29, 2019 12:05 AM
> To: Vishal Sagar <vsagar@xxxxxxxxxx>
> Cc: Hyun Kwon <hyunk@xxxxxxxxxx>; Vishal Sagar <vishal.sagar@xxxxxxxxxx>;
> laurent.pinchart@xxxxxxxxxxxxxxxx; mchehab@xxxxxxxxxx;
> robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; Michal Simek
> <michals@xxxxxxxxxx>; linux-media@xxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; sakari.ailus@xxxxxxxxxxxxxxx;
> hans.verkuil@xxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; Dinesh Kumar <dineshk@xxxxxxxxxx>; Sandip Kothari
> <sandipk@xxxxxxxxxx>
> Subject: Re: [PATCH v2 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx
> Subsystem driver
>
> Hi Vishal,
>
> On Mon, 2019-01-28 at 03:16:49 -0800, Vishal Sagar wrote:
> > Hi Hyun,
> >
> > Thanks for the review.
> >
> > > -----Original Message-----
> > > From: Hyun Kwon [mailto:hyun.kwon@xxxxxxxxxx]
> > > Sent: Saturday, January 26, 2019 7:45 AM
> > > To: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> > > Cc: Hyun Kwon <hyunk@xxxxxxxxxx>; laurent.pinchart@xxxxxxxxxxxxxxxx;
> > > mchehab@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> Michal
> > > Simek <michals@xxxxxxxxxx>; linux-media@xxxxxxxxxxxxxxx;
> > > devicetree@xxxxxxxxxxxxxxx; sakari.ailus@xxxxxxxxxxxxxxx;
> > > hans.verkuil@xxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> > > kernel@xxxxxxxxxxxxxxx; Dinesh Kumar <dineshk@xxxxxxxxxx>; Sandip
> Kothari
> > > <sandipk@xxxxxxxxxx>
> > > Subject: Re: [PATCH v2 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx
> > > Subsystem driver
> > >
> > > Hi Vishal,
> > >
> > > Thanks for the patch.
> > >
> > > On Fri, 2019-01-25 at 09:52:57 -0800, Vishal Sagar wrote:
> > > > The Xilinx MIPI CSI-2 Rx Subsystem soft IP is used to capture images
> > > > from MIPI CSI-2 camera sensors and output AXI4-Stream video data ready
> > > > for image processing. Please refer to PG232 for details.
> > > >
> > > > The driver is used to set the number of active lanes, if enabled
> > > > in hardware. The CSI2 Rx controller filters out all packets except for
> > > > the packets with data type fixed in hardware. RAW8 packets are always
> > > > allowed to pass through.
> > > >
> > > > It is also used to setup and handle interrupts and enable the core. It
> > > > logs all the events in respective counters between streaming on and off.
> > > > The generic short packets received are notified to application via
> > > > v4l2_events.
> > > >
> > > > The driver supports only the video format bridge enabled configuration.
> > > > Some data types like YUV 422 10bpc, RAW16, RAW20 are supported
> when
> > > the
> > > > CSI v2.0 feature is enabled in design. When the VCX feature is enabled,
> > > > the maximum number of virtual channels becomes 16 from 4.
> > > >
> > > > Signed-off-by: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> > > > ---
> > > > v2
> > > > - Fixed comments given by Hyun and Sakari.
> > > > - Made all bitmask using BIT() and GENMASK()
> > > > - Removed unused definitions
> > > > - Removed DPHY access. This will be done by separate DPHY PHY driver.
> > > > - Added support for CSI v2.0 for YUV 422 10bpc, RAW16, RAW20 and
> extra
> > > > virtual channels
> > > > - Fixed the ports as sink and source
> > > > - Now use the v4l2fwnode API to get number of data-lanes
> > > > - Added clock framework support
> > > > - Removed the close() function
> > > > - updated the set format function
> > > > - support only VFB enabled configuration
> > > >
> > > > drivers/media/platform/xilinx/Kconfig | 10 +
> > > > drivers/media/platform/xilinx/Makefile | 1 +
> > > > drivers/media/platform/xilinx/xilinx-csi2rxss.c | 1609
> > > +++++++++++++++++++++++
> > > > include/uapi/linux/xilinx-v4l2-controls.h | 14 +
> > > > include/uapi/linux/xilinx-v4l2-events.h | 28 +
> > > > 5 files changed, 1662 insertions(+)
> > > > create mode 100644 drivers/media/platform/xilinx/xilinx-csi2rxss.c
> > > > create mode 100644 include/uapi/linux/xilinx-v4l2-events.h
> > > >
> > > > diff --git a/drivers/media/platform/xilinx/Kconfig
> > > b/drivers/media/platform/xilinx/Kconfig
> > > > index 74ec8aa..30b4a25 100644
> > > > --- a/drivers/media/platform/xilinx/Kconfig
> > > > +++ b/drivers/media/platform/xilinx/Kconfig
> > > > @@ -10,6 +10,16 @@ config VIDEO_XILINX
> > > >
> > > > if VIDEO_XILINX
> > > >
> > > > +config VIDEO_XILINX_CSI2RXSS
> > > > + tristate "Xilinx CSI2 Rx Subsystem"
> > > > + help
> > > > + Driver for Xilinx MIPI CSI2 Rx Subsystem. This is a V4L sub-device
> > > > + based driver that takes input from CSI2 Tx source and converts
> > > > + it into an AXI4-Stream. The subsystem comprises of a CSI2 Rx
> > > > + controller, DPHY, an optional I2C controller and a Video Format
> > > > + Bridge. The driver is used to set the number of active lanes and
> > > > + get short packet data.
> > > > +
> > > > config VIDEO_XILINX_TPG
> > > > tristate "Xilinx Video Test Pattern Generator"
> > > > depends on VIDEO_XILINX
> > > > diff --git a/drivers/media/platform/xilinx/Makefile
> > > b/drivers/media/platform/xilinx/Makefile
> > > > index 4cdc0b1..6119a34 100644
> > > > --- a/drivers/media/platform/xilinx/Makefile
> > > > +++ b/drivers/media/platform/xilinx/Makefile
> > > > @@ -3,5 +3,6 @@
> > > > xilinx-video-objs += xilinx-dma.o xilinx-vip.o xilinx-vipp.o
> > > >
> > > > obj-$(CONFIG_VIDEO_XILINX) += xilinx-video.o
> > > > +obj-$(CONFIG_VIDEO_XILINX_CSI2RXSS) += xilinx-csi2rxss.o
> > > > obj-$(CONFIG_VIDEO_XILINX_TPG) += xilinx-tpg.o
> > > > obj-$(CONFIG_VIDEO_XILINX_VTC) += xilinx-vtc.o
> > > > diff --git a/drivers/media/platform/xilinx/xilinx-csi2rxss.c
> > > b/drivers/media/platform/xilinx/xilinx-csi2rxss.c
> > > > new file mode 100644
> > > > index 0000000..5accf01
> > > > --- /dev/null
> > > > +++ b/drivers/media/platform/xilinx/xilinx-csi2rxss.c
> > > > @@ -0,0 +1,1609 @@
> > > > +// SPDX-License-Identifier: GPL-2.0+
> > > > +/*
> > > > + * Driver for Xilinx MIPI CSI2 Rx Subsystem
> > > > + *
> > > > + * Copyright (C) 2016 - 2019 Xilinx, Inc.
> > > > + *
> > > > + * Contacts: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> > > > + *
> > > > + */
> > > > +#include <linux/clk.h>
> > > > +#include <linux/delay.h>
> > > > +#include <linux/interrupt.h>
> > > > +#include <linux/module.h>
> > > > +#include <linux/mutex.h>
> > > > +#include <linux/of.h>
> > > > +#include <linux/of_irq.h>
> > > > +#include <linux/platform_device.h>
> > > > +#include <linux/v4l2-subdev.h>
> > > > +#include <linux/xilinx-v4l2-controls.h>
> > > > +#include <linux/xilinx-v4l2-events.h>
> > > > +#include <media/media-entity.h>
> > > > +#include <media/v4l2-common.h>
> > > > +#include <media/v4l2-ctrls.h>
> > > > +#include <media/v4l2-event.h>
> > > > +#include <media/v4l2-fwnode.h>
> > > > +#include <media/v4l2-subdev.h>
> > > > +#include "xilinx-vip.h"
> > > > +
> > > > +/* Register register map */
> > > > +#define XCSI_CCR_OFFSET 0x00
> > > > +#define XCSI_CCR_SOFTRESET BIT(1)
> > > > +#define XCSI_CCR_ENABLE BIT(0)
> > > > +
> > > > +#define XCSI_PCR_OFFSET 0x04
> > > > +#define XCSI_PCR_MAXLANES_MASK GENMASK(4, 3)
> > > > +#define XCSI_PCR_ACTLANES_MASK GENMASK(1, 0)
> > > > +
> > > > +#define XCSI_CSR_OFFSET 0x10
> > > > +#define XCSI_CSR_PKTCNT GENMASK(31, 16)
> > > > +#define XCSI_CSR_SPFIFOFULL BIT(3)
> > > > +#define XCSI_CSR_SPFIFONE BIT(2)
> > > > +#define XCSI_CSR_SLBF BIT(1)
> > > > +#define XCSI_CSR_RIPCD BIT(0)
> > > > +
> > > > +#define XCSI_GIER_OFFSET 0x20
> > > > +#define XCSI_GIER_GIE BIT(0)
> > > > +
> > > > +#define XCSI_ISR_OFFSET 0x24
> > > > +#define XCSI_IER_OFFSET 0x28
> > > > +
> > > > +#define XCSI_ISR_FR BIT(31)
> > > > +#define XCSI_ISR_VCXFE BIT(30)
> > > > +#define XCSI_ISR_WCC BIT(22)
> > > > +#define XCSI_ISR_ILC BIT(21)
> > > > +#define XCSI_ISR_SPFIFOF BIT(20)
> > > > +#define XCSI_ISR_SPFIFONE BIT(19)
> > > > +#define XCSI_ISR_SLBF BIT(18)
> > > > +#define XCSI_ISR_STOP BIT(17)
> > > > +#define XCSI_ISR_SOTERR BIT(13)
> > > > +#define XCSI_ISR_SOTSYNCERR BIT(12)
> > > > +#define XCSI_ISR_ECC2BERR BIT(11)
> > > > +#define XCSI_ISR_ECC1BERR BIT(10)
> > > > +#define XCSI_ISR_CRCERR BIT(9)
> > > > +#define XCSI_ISR_DATAIDERR BIT(8)
> > > > +#define XCSI_ISR_VC3FSYNCERR BIT(7)
> > > > +#define XCSI_ISR_VC3FLVLERR BIT(6)
> > > > +#define XCSI_ISR_VC2FSYNCERR BIT(5)
> > > > +#define XCSI_ISR_VC2FLVLERR BIT(4)
> > > > +#define XCSI_ISR_VC1FSYNCERR BIT(3)
> > > > +#define XCSI_ISR_VC1FLVLERR BIT(2)
> > > > +#define XCSI_ISR_VC0FSYNCERR BIT(1)
> > > > +#define XCSI_ISR_VC0FLVLERR BIT(0)
> > > > +
> > > > +#define XCSI_INTR_PROT_MASK (XCSI_ISR_VC3FSYNCERR |
> > > XCSI_ISR_VC3FLVLERR |\
> > > > + XCSI_ISR_VC2FSYNCERR |
> > > XCSI_ISR_VC2FLVLERR |\
> > > > + XCSI_ISR_VC1FSYNCERR |
> > > XCSI_ISR_VC1FLVLERR |\
> > > > + XCSI_ISR_VC0FSYNCERR |
> > > XCSI_ISR_VC0FLVLERR |\
> > > > + XCSI_ISR_VCXFE)
> > > > +
> > > > +#define XCSI_INTR_PKTLVL_MASK (XCSI_ISR_ECC2BERR |
> > > XCSI_ISR_ECC1BERR |\
> > > > + XCSI_ISR_CRCERR | XCSI_ISR_DATAIDERR)
> > > > +
> > > > +#define XCSI_INTR_DPHY_MASK (XCSI_ISR_SOTERR |
> > > XCSI_ISR_SOTSYNCERR)
> > > > +
> > > > +#define XCSI_INTR_SPKT_MASK (XCSI_ISR_SPFIFOF |
> XCSI_ISR_SPFIFONE)
> > > > +
> > > > +#define XCSI_INTR_ERR_MASK (XCSI_ISR_WCC | XCSI_ISR_ILC |
> > > XCSI_ISR_SLBF |\
> > > > + XCSI_ISR_STOP)
> > > > +
> > > > +#define XCSI_INTR_FRAMERCVD_MASK (XCSI_ISR_FR)
> > > > +
> > > > +#define XCSI_ISR_ALLINTR_MASK (XCSI_INTR_PROT_MASK |
> > > XCSI_INTR_PKTLVL_MASK |\
> > > > + XCSI_INTR_DPHY_MASK |
> > > XCSI_INTR_SPKT_MASK |\
> > > > + XCSI_INTR_ERR_MASK |
> > > XCSI_INTR_FRAMERCVD_MASK)
> > > > +
> > > > +/*
> > > > + * Removed VCXFE mask as it doesn't exist in IER
> > > > + * Removed STOP state irq as this will keep driver in irq handler only
> > > > + */
> > > > +#define XCSI_IER_INTR_MASK (XCSI_ISR_ALLINTR_MASK &\
> > > > + ~(XCSI_ISR_STOP | XCSI_ISR_VCXFE))
> > > > +
> > > > +#define XCSI_SPKTR_OFFSET 0x30
> > > > +#define XCSI_SPKTR_DATA GENMASK(23, 8)
> > > > +#define XCSI_SPKTR_VC GENMASK(7, 6)
> > > > +#define XCSI_SPKTR_DT GENMASK(5, 0)
> > > > +
> > > > +#define XCSI_VCXR_OFFSET 0x34
> > > > +#define XCSI_VCXR_VCERR GENMASK(23, 0)
> > > > +#define XCSI_VCXR_VCSTART 4
> > > > +#define XCSI_VCXR_VCEND 15
> > > > +#define XCSI_VCXR_FSYNCERR BIT(1)
> > > > +#define XCSI_VCXR_FLVLERR BIT(0)
> > > > +
> > > > +#define XCSI_CLKINFR_OFFSET 0x3C
> > > > +#define XCSI_CLKINFR_STOP BIT(1)
> > > > +
> > > > +#define XCSI_DLXINFR_OFFSET 0x40
> > > > +#define XCSI_DLXINFR_STOP BIT(5)
> > > > +#define XCSI_DLXINFR_SOTERR BIT(1)
> > > > +#define XCSI_DLXINFR_SOTSYNCERR BIT(0)
> > > > +#define XCSI_MAXDL_COUNT 0x4
> > > > +
> > > > +#define XCSI_VCXINF1R_OFFSET 0x60
> > > > +#define XCSI_VCXINF1R_LINECOUNT GENMASK(31, 16)
> > > > +#define XCSI_VCXINF1R_LINECOUNT_SHIFT 16
> > > > +#define XCSI_VCXINF1R_BYTECOUNT GENMASK(15, 0)
> > > > +
> > > > +#define XCSI_VCXINF2R_OFFSET 0x64
> > > > +#define XCSI_VCXINF2R_DT GENMASK(5, 0)
> > > > +#define XCSI_MAXVCX_COUNT 16
> > > > +
> > > > +/*
> > > > + * The core takes less than 100 video clock cycles to reset.
> > > > + * So choosing a timeout value larger than this.
> > > > + */
> > > > +#define XCSI_TIMEOUT_VAL 1000 /* us */
> > > > +
> > > > +/* Maximum short packet events */
> > > > +#define XCSI_MAX_SPKT_EVENT 64
> > > > +
> > > > +/*
> > > > + * Sink pad connected to sensor source pad.
> > > > + * Source pad connected to next module like demosaic.
> > > > + */
> > > > +#define XCSI_MEDIA_PADS 2
> > > > +#define XCSI_DEFAULT_WIDTH 1920
> > > > +#define XCSI_DEFAULT_HEIGHT 1080
> > > > +
> > > > +/* Max string length for CSI Data type string */
> > > > +#define XCSI_PXLFMT_STRLEN_MAX 16
> > > > +
> > > > +/* This range is the tolerance for DPHY clock of 200 MHz */
> > > > +#define XCSI_DPHY_CLK_MIN 197000000000UL
> > > > +#define XCSI_DPHY_CLK_MAX 203000000000UL
> > >
> > > Could you share where this range comes from? Is it defined somewhere,
> > > or from test?
> > >
> > > > +#define XCSI_DPHY_CLK_REQ 200000000000UL
> > >
> > > The changelog mentions there'll be a separate phy driver. Then wouldn't
> > > the phy driver have to set own clock? If the phy driver becomes a child
> > > driver of this subsystem driver, then it's fine to do it here.
> > >
> >
> > This CSI2 Rx controller is tied to Xilinx DPHY controller.
> > It would be good to have a separate phy driver for Xilinx DPHY which controls
> this clock.
> > But till then, the DPHY 200Mhz clock should be controlled by this driver.
> >
> > Is this ok?
> >
>
> The dt binding shouldn't change, because otherwise it means the current
> dt binding is incorrect.
>

This will be removed from here as it is part of DPHY driver.
The DPHY driver binding will be added to CSIRx dt node as a required property later.

> > > > +
> > > > +/* MIPI CSI2 Data Types from spec */
> > > > +#define XCSI_DT_YUV4228B 0x1E
> > > > +#define XCSI_DT_YUV42210B 0x1F
> > > > +#define XCSI_DT_RGB444 0x20
> > > > +#define XCSI_DT_RGB555 0x21
> > > > +#define XCSI_DT_RGB565 0x22
> > > > +#define XCSI_DT_RGB666 0x23
> > > > +#define XCSI_DT_RGB888 0x24
> > > > +#define XCSI_DT_RAW6 0x28
> > > > +#define XCSI_DT_RAW7 0x29
> > > > +#define XCSI_DT_RAW8 0x2A
> > > > +#define XCSI_DT_RAW10 0x2B
> > > > +#define XCSI_DT_RAW12 0x2C
> > > > +#define XCSI_DT_RAW14 0x2D
> > > > +#define XCSI_DT_RAW16 0x2E
> > > > +#define XCSI_DT_RAW20 0x2F
> > > > +
> > > > +#define XCSI_VCX_START 4
> > > > +#define XCSI_MAX_VC 4
> > > > +#define XCSI_MAX_VCX 16
> > > > +
> > > > +#define XCSI_NEXTREG_OFFSET 4
> > > > +
> > > > +/* Bayer pattern for RAW data */
> > > > +#define XCSI_BAYER_RGGB 0
> > > > +#define XCSI_BAYER_BGGR 1
> > > > +#define XCSI_BAYER_GBRG 2
> > > > +#define XCSI_BAYER_GRBG 3
> > > > +
> > > > +/* There are 2 events frame sync and frame level error per VC */
> > > > +#define XCSI_VCX_NUM_EVENTS ((XCSI_MAX_VCX -
> XCSI_MAX_VC) * 2)
> > > > +
> > > > +/*
> > > > + * Macro to return "true" or "false" string if bit is set
> > > > + */
> > >
> > > Single line comment would be fine.
> >
> > Agree. Will update it in next version.
> >
> > >
> > > > +#define XCSI_GET_BITSET_STR(val, mask) (val) & (mask) ? "true" :
> "false"
> > > > +
> > > > +static const struct of_device_id xcsi2rxss_of_id_table[] = {
> > > > + { .compatible = "xlnx,mipi-csi2-rx-subsystem-4.0",},
> > > > + { }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(of, xcsi2rxss_of_id_table);
> > > > +
> > >
> > > This is a little too far from where this is used. :-) I'd move it
> > > to closer.
> >
> > Ok will move it in next revision.
> >
> > >
> > > > +/**
> > > > + * struct xcsi2rxss_event - Event log structure
> > > > + * @mask: Event mask
> > > > + * @name: Name of the event
> > > > + * @counter: Count number of events
> > > > + */
> > > > +struct xcsi2rxss_event {
> > > > + u32 mask;
> > > > + const char * const name;
> > >
> > > Nit. extra space after '*'.
> >
> > Will fix in next version.
> >
> > >
> > > > + unsigned int counter;
> > > > +};
> > > > +
> > > > +/*
> > > > + * struct xcsi2rxss_core - Core configuration CSI2 Rx Subsystem device
> > > structure
> > > > + * @dev: Platform structure
> > > > + * @iomem: Base address of subsystem
> > > > + * @irq: requested irq number
> > > > + * @enable_active_lanes: If number of active lanes can be modified
> > > > + * @max_num_lanes: Maximum number of lanes present
> > > > + * @vfb: Video Format Bridge enabled or not
> > > > + * @datatype: Data type filter
> > > > + * @bayer: bayer pattern
> > > > + * @events: Structure to maintain event logs
> > > > + * @vcx_events: Structure to maintain VCX event logs
> > > > + * @en_vcx: If more than 4 VC are enabled
> > > > + * @en_csi_v20: If CSI v2.0 is enabled
> > > > + * @lite_aclk: AXI4-Lite interface clock
> > > > + * @video_aclk: Video clock
> > > > + * @dphy_clk_200M: 200MHz DPHY clock
> > > > + */
> > > > +struct xcsi2rxss_core {
> > > > + struct device *dev;
> > > > + void __iomem *iomem;
> > > > + int irq;
> > > > + bool enable_active_lanes;
> > > > + u32 max_num_lanes;
> > > > + bool vfb;
> > > > + u32 datatype;
> > > > + u32 bayer;
> > > > + struct xcsi2rxss_event *events;
> > > > + struct xcsi2rxss_event *vcx_events;
> > > > + bool en_vcx;
> > > > + bool en_csi_v20;
> > > > + struct clk *lite_aclk;
> > > > + struct clk *video_aclk;
> > > > + struct clk *dphy_clk_200M;
> > > > +};
> > > > +
> > > > +/**
> > > > + * struct xcsi2rxss_state - CSI2 Rx Subsystem device structure
> > > > + * @core: Core structure for MIPI CSI2 Rx Subsystem
> > > > + * @subdev: The v4l2 subdev structure
> > > > + * @ctrl_handler: control handler
> > > > + * @format: Active V4L2 formats on each pad
> > > > + * @event: Holds the short packet event
> > > > + * @lock: mutex for serializing operations
> > >
> > > It may be just me, but it's not clear what it wants to serialize.
> > > The comment better describe what resource it protects.
> >
> > Ok will mention that in the next revision.
> > >
> > > > + * @pads: media pads
> > > > + * @streaming: Flag for storing streaming state
> > > > + *
> > > > + * This structure contains the device driver related parameters
> > > > + */
> > > > +struct xcsi2rxss_state {
> > > > + struct xcsi2rxss_core core;
> > > > + struct v4l2_subdev subdev;
> > > > + struct v4l2_ctrl_handler ctrl_handler;
> > > > + struct v4l2_mbus_framefmt format;
> > > > + struct v4l2_event event;
> > > > + /* used to serialize v4l2 operations */
> > > > + struct mutex lock;
> > > > + struct media_pad pads[XCSI_MEDIA_PADS];
> > > > + bool streaming;
> > > > +};
> > > > +
> > > > +static struct xcsi2rxss_event xcsi2rxss_events[] = {
> > > > + { XCSI_ISR_FR, "Frame Received", 0 },
> > > > + { XCSI_ISR_VCXFE, "VCX Frame Errors", 0 },
> > > > + { XCSI_ISR_WCC, "Word Count Errors", 0 },
> > > > + { XCSI_ISR_ILC, "Invalid Lane Count Error", 0 },
> > > > + { XCSI_ISR_SPFIFOF, "Short Packet FIFO OverFlow Error", 0 },
> > > > + { XCSI_ISR_SPFIFONE, "Short Packet FIFO Not Empty", 0 },
> > > > + { XCSI_ISR_SLBF, "Streamline Buffer Full Error", 0 },
> > > > + { XCSI_ISR_STOP, "Lane Stop State", 0 },
> > > > + { XCSI_ISR_SOTERR, "SOT Error", 0 },
> > > > + { XCSI_ISR_SOTSYNCERR, "SOT Sync Error", 0 },
> > > > + { XCSI_ISR_ECC2BERR, "2 Bit ECC Unrecoverable Error", 0 },
> > > > + { XCSI_ISR_ECC1BERR, "1 Bit ECC Recoverable Error", 0 },
> > > > + { XCSI_ISR_CRCERR, "CRC Error", 0 },
> > > > + { XCSI_ISR_DATAIDERR, "Data Id Error", 0 },
> > > > + { XCSI_ISR_VC3FSYNCERR, "Virtual Channel 3 Frame Sync Error", 0 },
> > > > + { XCSI_ISR_VC3FLVLERR, "Virtual Channel 3 Frame Level Error", 0 },
> > > > + { XCSI_ISR_VC2FSYNCERR, "Virtual Channel 2 Frame Sync Error", 0 },
> > > > + { XCSI_ISR_VC2FLVLERR, "Virtual Channel 2 Frame Level Error", 0 },
> > > > + { XCSI_ISR_VC1FSYNCERR, "Virtual Channel 1 Frame Sync Error", 0 },
> > > > + { XCSI_ISR_VC1FLVLERR, "Virtual Channel 1 Frame Level Error", 0 },
> > > > + { XCSI_ISR_VC0FSYNCERR, "Virtual Channel 0 Frame Sync Error", 0 },
> > > > + { XCSI_ISR_VC0FLVLERR, "Virtual Channel 0 Frame Level Error", 0 }
> > > > +};
> > > > +
> > > > +#define XCSI_NUM_EVENTS ARRAY_SIZE(xcsi2rxss_events)
> > > > +
> > > > +static inline struct xcsi2rxss_state *
> > > > +to_xcsi2rxssstate(struct v4l2_subdev *subdev)
> > > > +{
> > > > + return container_of(subdev, struct xcsi2rxss_state, subdev);
> > > > +}
> > > > +
> > > > +/*
> > > > + * Register related operations
> > > > + */
> > >
> > > The xilinx-vip has same IO functions, but up to you.
> > >
> > > > +static inline u32 xcsi2rxss_read(struct xcsi2rxss_core *xcsi2rxss, u32
> addr)
> > > > +{
> > > > + return ioread32(xcsi2rxss->iomem + addr);
> > > > +}
> > > > +
> > > > +static inline void xcsi2rxss_write(struct xcsi2rxss_core *xcsi2rxss, u32
> addr,
> > > > + u32 value)
> > > > +{
> > > > + iowrite32(value, xcsi2rxss->iomem + addr);
> > > > +}
> > > > +
> > > > +static inline void xcsi2rxss_clr(struct xcsi2rxss_core *xcsi2rxss, u32 addr,
> > > > + u32 clr)
> > > > +{
> > > > + xcsi2rxss_write(xcsi2rxss, addr,
> > > > + xcsi2rxss_read(xcsi2rxss, addr) & ~clr);
> > > > +}
> > > > +
> > > > +static inline void xcsi2rxss_set(struct xcsi2rxss_core *xcsi2rxss, u32 addr,
> > > > + u32 set)
> > > > +{
> > > > + xcsi2rxss_write(xcsi2rxss, addr,
> > > > + xcsi2rxss_read(xcsi2rxss, addr) | set);
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_clr_and_set - Clear and set the register with a bitmask
> > > > + * @xcsi2rxss: Xilinx MIPI CSI2 Rx Subsystem subdev core struct
> > > > + * @addr: address of register
> > > > + * @clr: bitmask to be cleared
> > > > + * @set: bitmask to be set
> > > > + *
> > > > + * Clear a bit(s) of mask @clr in the register at address @addr, then set
> > > > + * a bit(s) of mask @set in the register after.
> > > > + */
> > > > +static void xcsi2rxss_clr_and_set(struct xcsi2rxss_core *xcsi2rxss,
> > > > + u32 addr, u32 clr, u32 set)
> > > > +{
> > > > + u32 reg;
> > > > +
> > > > + reg = xcsi2rxss_read(xcsi2rxss, addr);
> > > > + reg &= ~clr;
> > > > + reg |= set;
> > > > + xcsi2rxss_write(xcsi2rxss, addr, reg);
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_enable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + xcsi2rxss_set(core, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_disable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + xcsi2rxss_clr(core, XCSI_CCR_OFFSET, XCSI_CCR_ENABLE);
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_intr_enable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + xcsi2rxss_clr(core, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
> > > > + xcsi2rxss_write(core, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
> > > > + xcsi2rxss_set(core, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_intr_disable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + xcsi2rxss_clr(core, XCSI_IER_OFFSET, XCSI_IER_INTR_MASK);
> > > > + xcsi2rxss_clr(core, XCSI_GIER_OFFSET, XCSI_GIER_GIE);
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_reset - Does a soft reset of the MIPI CSI2 Rx Subsystem
> > > > + * @core: Core Xilinx CSI2 Rx Subsystem structure pointer
> > > > + *
> > > > + * Core takes less than 100 video clock cycles to reset.
> > > > + * So a larger timeout value is chosen for margin.
> > > > + *
> > > > + * Return: 0 - on success OR -ETIME if reset times out
> > > > + */
> > > > +static int xcsi2rxss_reset(struct xcsi2rxss_core *core)
> > > > +{
> > > > + u32 timeout = XCSI_TIMEOUT_VAL;
> > > > +
> > > > + xcsi2rxss_set(core, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET);
> > > > +
> > > > + while (xcsi2rxss_read(core, XCSI_CSR_OFFSET) & XCSI_CSR_RIPCD) {
> > > > + if (timeout == 0) {
> > > > + dev_err(core->dev, "soft reset timed out!\n");
> > > > + return -ETIME;
> > > > + }
> > > > +
> > > > + timeout--;
> > > > + udelay(1);
> > > > + }
> > > > +
> > > > + xcsi2rxss_clr(core, XCSI_CCR_OFFSET, XCSI_CCR_SOFTRESET);
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_irq_handler - Interrupt handler for CSI-2
> > > > + * @irq: IRQ number
> > > > + * @dev_id: Pointer to device state
> > > > + *
> > > > + * In the interrupt handler, a list of event counters are updated for
> > > > + * corresponding interrupts. This is useful to get status / debug.
> > > > + * If the short packet FIFO not empty or overflow interrupt is received
> > > > + * capture the short packet and notify of event occurrence
> > > > + *
> > > > + * Return: IRQ_HANDLED after handling interrupts
> > > > + * IRQ_NONE is no interrupts
> > > > + */
> > > > +static irqreturn_t xcsi2rxss_irq_handler(int irq, void *dev_id)
> > > > +{
> > > > + struct xcsi2rxss_state *state = (struct xcsi2rxss_state *)dev_id;
> > > > + struct xcsi2rxss_core *core = &state->core;
> > > > + u32 status;
> > > > +
> > > > + status = xcsi2rxss_read(core, XCSI_ISR_OFFSET) &
> > > XCSI_ISR_ALLINTR_MASK;
> > > > + dev_dbg(core->dev, "interrupt status = 0x%08x\n", status);
> > >
> > > Shouldn't this be rate-limited? I let you decide.
> >
> > Right. I will add that to all messages in the IRQ handler.
> >
> > >
> > > > +
> > > > + if (!status)
> > > > + return IRQ_NONE;
> > > > +
> > > > + /* Received a short packet */
> > > > + if (status & XCSI_ISR_SPFIFONE) {
> > > > + memset(&state->event, 0, sizeof(state->event));
> > > > + state->event.type = V4L2_EVENT_XLNXCSIRX_SPKT;
> > > > + *((u32 *)(&state->event.u.data)) =
> > > > + xcsi2rxss_read(core, XCSI_SPKTR_OFFSET);
> > > > + v4l2_subdev_notify_event(&state->subdev, &state->event);
> > > > + }
> > > > +
> > > > + /* Short packet FIFO overflow */
> > > > + if (status & XCSI_ISR_SPFIFOF) {
> > > > + dev_alert(core->dev, "Short packet FIFO overflowed\n");
> > > > + memset(&state->event, 0, sizeof(state->event));
> > > > + state->event.type = V4L2_EVENT_XLNXCSIRX_SPKT_OVF;
> > > > + v4l2_subdev_notify_event(&state->subdev, &state->event);
> > > > + }
> > > > +
> > > > + /*
> > > > + * Stream line buffer full
> > > > + * This means there is a backpressure from downstream IP
> > > > + */
> > > > + if (status & XCSI_ISR_SLBF) {
> > > > + dev_alert(core->dev, "Stream Line Buffer Full!\n");
> > > > + memset(&state->event, 0, sizeof(state->event));
> > > > + state->event.type = V4L2_EVENT_XLNXCSIRX_SLBF;
> > > > + v4l2_subdev_notify_event(&state->subdev, &state->event);
> > > > + }
> > > > +
> > > > + /* Increment event counters */
> > > > + if (status & XCSI_ISR_ALLINTR_MASK) {
> > > > + unsigned int i;
> > > > +
> > > > + for (i = 0; i < XCSI_NUM_EVENTS; i++) {
> > > > + if (!(status & core->events[i].mask))
> > > > + continue;
> > > > + core->events[i].counter++;
> > > > + dev_dbg(core->dev, "%s: %d\n", core->events[i].name,
> > > > + core->events[i].counter);
> > > > + }
> > > > +
> > > > + if (status & XCSI_ISR_VCXFE && core->en_vcx) {
> > > > + u32 vcxstatus;
> > > > +
> > > > + vcxstatus = xcsi2rxss_read(core, XCSI_VCXR_OFFSET);
> > > > + vcxstatus &= XCSI_VCXR_VCERR;
> > > > + for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) {
> > > > + if (!(vcxstatus & core->vcx_events[i].mask))
> > > > + continue;
> > > > + core->vcx_events[i].counter++;
> > > > + }
> > > > + xcsi2rxss_write(core, XCSI_VCXR_OFFSET, vcxstatus);
> > > > + }
> > > > + }
> > > > +
> > > > + xcsi2rxss_write(core, XCSI_ISR_OFFSET, status);
> > > > + return IRQ_HANDLED;
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_reset_event_counters(struct xcsi2rxss_state *state)
> > > > +{
> > > > + int i;
> > >
> > > Nit. unsigned.
> > >
> >
> > Ok.
> >
> > > > +
> > > > + for (i = 0; i < XCSI_NUM_EVENTS; i++)
> > > > + state->core.events[i].counter = 0;
> > > > +
> > > > + if (state->core.en_vcx)
> > >
> > > I don't know what's recommened style, but for multiline statement,
> > > putting braces seems better for readability. Up to you.
> > >
> >
> > I didn't get any checkpatch warnings for this so kept it like this.
> > Ok I will add the braces.
> >
> > > > + for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++)
> > > > + state->core.vcx_events[i].counter = 0;
> > > > +}
> > > > +
> > > > +/* Print event counters */
> > > > +static void xcsi2rxss_log_counters(struct xcsi2rxss_state *state)
> > > > +{
> > > > + struct xcsi2rxss_core *core = &state->core;
> > > > + int i;
> > > > +
> > > > + for (i = 0; i < XCSI_NUM_EVENTS; i++) {
> > > > + if (core->events[i].counter > 0)
> > > > + dev_info(core->dev, "%s events: %d\n",
> > > > + core->events[i].name,
> > > > + core->events[i].counter);
> > > > + }
> > > > +
> > > > + if (core->en_vcx)
> > > > + for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++) {
> > > > + if (core->vcx_events[i].counter > 0)
> > > > + dev_info(core->dev,
> > > > + "VC %d Frame %s err vcx events: %d\n",
> > > > + (i / 2) + XCSI_VCX_START,
> > > > + i & 1 ? "Sync" : "Level",
> > > > + core->vcx_events[i].counter);
> > > > + }
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_log_status - Logs the status of the CSI-2 Receiver
> > > > + * @sd: Pointer to V4L2 subdevice structure
> > > > + *
> > > > + * This function prints the current status of Xilinx MIPI CSI-2
> > > > + *
> > > > + * Return: 0 on success
> > > > + */
> > > > +static int xcsi2rxss_log_status(struct v4l2_subdev *sd)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + struct xcsi2rxss_core *core = &xcsi2rxss->core;
> > > > + unsigned int reg, data, i, max_vc;
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > >
> > > This lock seems to protect access to xcsi2rxss. If so, could you please
> > > clarify in the lock description?
> >
> > Yes will update the name in the next version.
> > >
> > > > +
> > > > + xcsi2rxss_log_counters(xcsi2rxss);
> > > > +
> > > > + dev_info(core->dev, "***** Core Status *****\n");
> > > > + data = xcsi2rxss_read(core, XCSI_CSR_OFFSET);
> > > > + dev_info(core->dev, "Short Packet FIFO Full = %s\n",
> > > > + XCSI_GET_BITSET_STR(data, XCSI_CSR_SPFIFOFULL));
> > > > + dev_info(core->dev, "Short Packet FIFO Not Empty = %s\n",
> > > > + XCSI_GET_BITSET_STR(data, XCSI_CSR_SPFIFONE));
> > > > + dev_info(core->dev, "Stream line buffer full = %s\n",
> > > > + XCSI_GET_BITSET_STR(data, XCSI_CSR_SLBF));
> > > > + dev_info(core->dev, "Soft reset/Core disable in progress = %s\n",
> > > > + XCSI_GET_BITSET_STR(data, XCSI_CSR_RIPCD));
> > > > +
> > > > + /* Clk & Lane Info */
> > > > + dev_info(core->dev, "******** Clock Lane Info *********\n");
> > > > + data = xcsi2rxss_read(core, XCSI_CLKINFR_OFFSET);
> > > > + dev_info(core->dev, "Clock Lane in Stop State = %s\n",
> > > > + XCSI_GET_BITSET_STR(data, XCSI_CLKINFR_STOP));
> > > > +
> > > > + dev_info(core->dev, "******** Data Lane Info *********\n");
> > > > + dev_info(core->dev, "Lane\tSoT Error\tSoT Sync Error\tStop State\n");
> > > > + reg = XCSI_DLXINFR_OFFSET;
> > > > + for (i = 0; i < XCSI_MAXDL_COUNT; i++) {
> > > > + data = xcsi2rxss_read(core, reg);
> > > > +
> > > > + dev_info(core->dev, "%d\t%s\t\t%s\t\t%s\n", i,
> > > > + XCSI_GET_BITSET_STR(data, XCSI_DLXINFR_SOTERR),
> > > > + XCSI_GET_BITSET_STR(data,
> > > XCSI_DLXINFR_SOTSYNCERR),
> > > > + XCSI_GET_BITSET_STR(data, XCSI_DLXINFR_STOP));
> > > > +
> > > > + reg += XCSI_NEXTREG_OFFSET;
> > > > + }
> > > > +
> > > > + /* Virtual Channel Image Information */
> > > > + dev_info(core->dev, "********** Virtual Channel Info
> > > ************\n");
> > > > + dev_info(core->dev, "VC\tLine Count\tByte Count\tData Type\n");
> > > > + if (core->en_vcx)
> > > > + max_vc = XCSI_MAX_VCX;
> > > > + else
> > > > + max_vc = XCSI_MAX_VC;
> > > > +
> > > > + reg = XCSI_VCXINF1R_OFFSET;
> > > > + for (i = 0; i < max_vc; i++) {
> > > > + u32 line_count, byte_count, data_type;
> > > > +
> > > > + /* Get line and byte count from VCXINFR1 Register */
> > > > + data = xcsi2rxss_read(core, reg);
> > > > + byte_count = data & XCSI_VCXINF1R_BYTECOUNT;
> > > > + line_count = data & XCSI_VCXINF1R_LINECOUNT;
> > > > + line_count >>= XCSI_VCXINF1R_LINECOUNT_SHIFT;
> > > > +
> > > > + /* Get data type from VCXINFR2 Register */
> > > > + reg += XCSI_NEXTREG_OFFSET;
> > > > + data = xcsi2rxss_read(core, reg);
> > > > + data_type = data & XCSI_VCXINF2R_DT;
> > > > +
> > > > + dev_info(core->dev, "%d\t%d\t\t%d\t\t0x%x\n", i, line_count,
> > > > + byte_count, data_type);
> > > > +
> > > > + /* Move to next pair of VC Info registers */
> > > > + reg += XCSI_NEXTREG_OFFSET;
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/*
> > > > + * xcsi2rxss_subscribe_event - Subscribe to the custom short packet
> > > > + * receive event.
> > > > + * @sd: V4L2 Sub device
> > > > + * @fh: V4L2 File Handle
> > > > + * @sub: Subcribe event structure
> > > > + *
> > > > + * There are two types of events to be subscribed.
> > > > + *
> > > > + * First is to register for receiving a generic short packet.
> > > > + * The generic short packets received are queued up in a FIFO.
> > > > + * On reception of a generic short packet, an event will be generated
> > > > + * with the short packet contents copied to its data area.
> > > > + * Application subscribed to this event will poll for POLLPRI.
> > > > + * On getting the event, the app dequeues the event to get the short
> packet
> > > > + * data.
> > > > + *
> > > > + * Second is to register for Short packet FIFO overflow
> > > > + * In case the rate of receiving short packets is high and
> > > > + * the short packet FIFO overflows, this event will be triggered.
> > > > + *
> > > > + * Return: 0 on success, errors otherwise
> > > > + */
> > > > +static int xcsi2rxss_subscribe_event(struct v4l2_subdev *sd,
> > > > + struct v4l2_fh *fh,
> > > > + struct v4l2_event_subscription *sub)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + int ret;
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > +
> > > > + switch (sub->type) {
> > > > + case V4L2_EVENT_XLNXCSIRX_SPKT:
> > > > + case V4L2_EVENT_XLNXCSIRX_SPKT_OVF:
> > > > + case V4L2_EVENT_XLNXCSIRX_SLBF:
> > > > + ret = v4l2_event_subscribe(fh, sub, XCSI_MAX_SPKT_EVENT,
> > > NULL);
> > > > + break;
> > > > + default:
> > > > + ret = -EINVAL;
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_unsubscribe_event - Unsubscribe from all events registered
> > > > + * @sd: V4L2 Sub device
> > > > + * @fh: V4L2 file handle
> > > > + * @sub: pointer to Event unsubscription structure
> > > > + *
> > > > + * Return: zero on success, else a negative error code.
> > > > + */
> > > > +static int xcsi2rxss_unsubscribe_event(struct v4l2_subdev *sd,
> > > > + struct v4l2_fh *fh,
> > > > + struct v4l2_event_subscription *sub)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + int ret;
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > + ret = v4l2_event_unsubscribe(fh, sub);
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_s_ctrl - This is used to set the Xilinx MIPI CSI-2 V4L2 controls
> > > > + * @ctrl: V4L2 control to be set
> > > > + *
> > > > + * This function is used to set the V4L2 controls for the Xilinx MIPI
> > > > + * CSI-2 Rx Subsystem. It is used to set the active lanes in the system.
> > > > + * The event counters can be reset.
> > > > + *
> > > > + * Return: 0 on success, errors otherwise
> > > > + */
> > > > +static int xcsi2rxss_s_ctrl(struct v4l2_ctrl *ctrl)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss =
> > > > + container_of(ctrl->handler, struct xcsi2rxss_state,
> > > > + ctrl_handler);
> > > > + struct xcsi2rxss_core *core = &xcsi2rxss->core;
> > > > + int ret = 0;
> > > > + u32 active_lanes = 1;
> > >
> > > Nit. This can move into if statement below, without initializing it.
> > >
> > Yes. Will do it in next version.
> >
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > +
> > > > + switch (ctrl->id) {
> > > > + case V4L2_CID_XILINX_MIPICSISS_ACT_LANES:
> > > > + /*
> > > > + * This will be called only when "Enable Active Lanes" parameter
> > > > + * is set in design
> > > > + */
> > > > + if (core->enable_active_lanes) {
> > > > + xcsi2rxss_clr_and_set(core, XCSI_PCR_OFFSET,
> > > > + XCSI_PCR_ACTLANES_MASK,
> > > > + ctrl->val - 1);
> > > > + /*
> > > > + * This delay is to allow the value to reflect as write
> > > > + * and read paths are different.
> > > > + */
> > > > + udelay(1);
> > >
> > > Interesting this is required.
> >
> > Yes I have mentioned the reason in the comments based on PG232.
> >
> > >
> > > > + active_lanes = xcsi2rxss_read(core, XCSI_PCR_OFFSET);
> > > > + active_lanes &= XCSI_PCR_ACTLANES_MASK;
> > > > + active_lanes++;
> > > > + if (active_lanes != ctrl->val)
> > > > + dev_info(core->dev, "RxByteClkHS absent\n");
> > > > + dev_dbg(core->dev, "active lanes = %d\n", ctrl->val);
> > > > + } else {
> > > > + ret = -EINVAL;
> > > > + }
> > > > + break;
> > > > + case V4L2_CID_XILINX_MIPICSISS_RESET_COUNTERS:
> > > > + xcsi2rxss_reset_event_counters(xcsi2rxss);
> > > > + break;
> > > > + default:
> > > > + break;
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_g_volatile_ctrl - get the Xilinx MIPI CSI-2 Rx controls
> > > > + * @ctrl: Pointer to V4L2 control
> > > > + *
> > > > + * This is used to get the number of frames received by the Xilinx
> > > > + * MIPI CSI-2 Rx.
> > > > + *
> > > > + * Return: 0 on success, errors otherwise
> > > > + */
> > > > +static int xcsi2rxss_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss =
> > > > + container_of(ctrl->handler, struct xcsi2rxss_state,
> > > > + ctrl_handler);
> > > > + int ret = 0;
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > +
> > > > + switch (ctrl->id) {
> > > > + case V4L2_CID_XILINX_MIPICSISS_FRAME_COUNTER:
> > > > + ctrl->val = xcsi2rxss->core.events[0].counter;
> > > > + break;
> > > > + default:
> > > > + ret = -EINVAL;
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_start_stream(struct xcsi2rxss_state *state)
> > > > +{
> > > > + struct xcsi2rxss_core *core = &state->core;
> > > > + int ret = 0;
> > > > +
> > > > + xcsi2rxss_enable(core);
> > > > +
> > > > + ret = xcsi2rxss_reset(core);
> > >
> > > As the soft reset is done after enabling, I guess soft reset doesn't
> > > reset those controls and registers which are set prior to it.
> > >
> >
> > Correct. As mentioned in PG 232 page 21 soft reset bit description,
> > "All registers reset to their default value (except for this bit, Core Enable and
> Active lanes configuration).
> > In addition to resetting registers when this bit is set to 1:
> > â Shut down port is not asserted on the PPI lanes
> > â Internal FIFOs (PPI, Packet, Generic Short Packet) are flushed
> > â Control Finite State Machine (FSM) stops processing current packet. Any
> partially written packet to
> > memory is marked as errored. This packet, when made available through the
> AXI4-Stream interface,
> > reports the error on TUSER[1]."
> >
>
> Thanks for sharing details. Wouldn't it be better to reset in disable then?

Resetting in start or stop is fine.
I will look at other drivers to follow the norm.

Regards
Vishal Sagar

>
> Thanks,
> -hyun
>
>
> >
> > > > + if (ret < 0) {
> > > > + state->streaming = false;
> > > > + return ret;
> > > > + }
> > > > +
> > > > + xcsi2rxss_intr_enable(core);
> > > > + state->streaming = true;
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_stop_stream(struct xcsi2rxss_state *state)
> > > > +{
> > > > + struct xcsi2rxss_core *core = &state->core;
> > > > +
> > > > + xcsi2rxss_intr_disable(core);
> > > > + xcsi2rxss_disable(core);
> > > > + state->streaming = false;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_s_stream - It is used to start/stop the streaming.
> > > > + * @sd: V4L2 Sub device
> > > > + * @enable: Flag (True / False)
> > > > + *
> > > > + * This function controls the start or stop of streaming for the
> > > > + * Xilinx MIPI CSI-2 Rx Subsystem.
> > > > + *
> > > > + * Return: 0 on success, errors otherwise
> > > > + */
> > > > +static int xcsi2rxss_s_stream(struct v4l2_subdev *sd, int enable)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + int ret = 0;
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > +
> > > > + if (enable) {
> > > > + if (!xcsi2rxss->streaming) {
> > > > + /* reset the event counters */
> > > > + xcsi2rxss_reset_event_counters(xcsi2rxss);
> > >
> > > Is this required here? or can it be done explicitly by the application
> > > separately?
> > >
> >
> > Yes this can be done separately by the application using the reset counters
> v4l2 command.
> > Reason to keep it here is to count the number of errors happening between
> enabling and disabling a stream.
> >
> > > > + ret = xcsi2rxss_start_stream(xcsi2rxss);
> > > > + }
> > > > + } else {
> > > > + if (xcsi2rxss->streaming)
> > > > + xcsi2rxss_stop_stream(xcsi2rxss);
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static struct v4l2_mbus_framefmt *
> > > > +__xcsi2rxss_get_pad_format(struct xcsi2rxss_state *xcsi2rxss,
> > > > + struct v4l2_subdev_pad_config *cfg,
> > > > + unsigned int pad, u32 which)
> > > > +{
> > > > + switch (which) {
> > > > + case V4L2_SUBDEV_FORMAT_TRY:
> > > > + return v4l2_subdev_get_try_format(&xcsi2rxss->subdev, cfg,
> > > > + pad);
> > > > + case V4L2_SUBDEV_FORMAT_ACTIVE:
> > > > + return &xcsi2rxss->format;
> > > > + default:
> > > > + return NULL;
> > > > + }
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_get_format - Get the pad format
> > > > + * @sd: Pointer to V4L2 Sub device structure
> > > > + * @cfg: Pointer to sub device pad information structure
> > > > + * @fmt: Pointer to pad level media bus format
> > > > + *
> > > > + * This function is used to get the pad format information.
> > > > + *
> > > > + * Return: 0 on success
> > > > + */
> > > > +static int xcsi2rxss_get_format(struct v4l2_subdev *sd,
> > > > + struct v4l2_subdev_pad_config *cfg,
> > > > + struct v4l2_subdev_format *fmt)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > +
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > + fmt->format = *__xcsi2rxss_get_pad_format(xcsi2rxss, cfg, fmt->pad,
> > > > + fmt->which);
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_set_format - This is used to set the pad format
> > > > + * @sd: Pointer to V4L2 Sub device structure
> > > > + * @cfg: Pointer to sub device pad information structure
> > > > + * @fmt: Pointer to pad level media bus format
> > > > + *
> > > > + * This function is used to set the pad format. Since the pad format is
> fixed
> > > > + * in hardware, it can't be modified on run time. So when a format set is
> > > > + * requested by application, all parameters except the format type is
> saved
> > > > + * for the pad and the original pad format is sent back to the application.
> > > > + *
> > > > + * Return: 0 on success
> > > > + */
> > > > +static int xcsi2rxss_set_format(struct v4l2_subdev *sd,
> > > > + struct v4l2_subdev_pad_config *cfg,
> > > > + struct v4l2_subdev_format *fmt)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + struct xcsi2rxss_core *core = &xcsi2rxss->core;
> > > > + struct v4l2_mbus_framefmt *__format;
> > > > + u32 code;
> > > > +
> > > > + /* only sink pad format can be updated */
> > > > + mutex_lock(&xcsi2rxss->lock);
> > > > +
> > > > + /*
> > > > + * Only the format->code parameter matters for CSI as the
> > > > + * CSI format cannot be changed at runtime.
> > > > + * Ensure that format to set is copied to over to CSI pad format
> > > > + */
> > > > + __format = __xcsi2rxss_get_pad_format(xcsi2rxss, cfg,
> > > > + fmt->pad, fmt->which);
> > > > +
> > > > + /* Save the pad format code */
> > > > + code = __format->code;
> > > > +
> > > > + /*
> > > > + * RAW8 is supported in all datatypes. So if requested media bus format
> > > > + * is of RAW8 type, then allow to be set. In case core is configured to
> > > > + * other RAW, YUV422 8/10 or RGB888, set appropriate media bus
> > > format.
> > > > + */
> > > > + if ((fmt->format.code == MEDIA_BUS_FMT_SBGGR8_1X8 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGBRG8_1X8 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGRBG8_1X8 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SRGGB8_1X8) ||
> > > > + (core->datatype == XCSI_DT_RAW10 &&
> > > > + (fmt->format.code == MEDIA_BUS_FMT_SBGGR10_1X10 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGBRG10_1X10 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGRBG10_1X10 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SRGGB10_1X10)) ||
> > > > + (core->datatype == XCSI_DT_RAW12 &&
> > > > + (fmt->format.code == MEDIA_BUS_FMT_SBGGR12_1X12 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGBRG12_1X12 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGRBG12_1X12 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SRGGB12_1X12)) ||
> > > > + (core->datatype == XCSI_DT_RAW14 &&
> > > > + (fmt->format.code == MEDIA_BUS_FMT_SBGGR14_1X14 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGBRG14_1X14 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGRBG14_1X14 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SRGGB14_1X14)) ||
> > > > + (core->datatype == XCSI_DT_RAW16 &&
> > > > + (fmt->format.code == MEDIA_BUS_FMT_SBGGR16_1X16 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGBRG16_1X16 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SGRBG16_1X16 ||
> > > > + fmt->format.code == MEDIA_BUS_FMT_SRGGB16_1X16)) ||
> > > > + (core->datatype == XCSI_DT_YUV4228B &&
> > > > + fmt->format.code == MEDIA_BUS_FMT_UYVY8_1X16) ||
> > > > + (core->datatype == XCSI_DT_YUV42210B &&
> > > > + fmt->format.code == MEDIA_BUS_FMT_UYVY8_1X16) ||
> > >
> > > Not sure if single bus format can be shared between 422 8B and 422 10B.
> >
> > You are right. I missed it. I will remove it in next version.
> >
> > >
> > > > + (core->datatype == XCSI_DT_RGB888 &&
> > > > + fmt->format.code == MEDIA_BUS_FMT_RBG888_1X24)) {
> > > > + /* Copy over the format to be set */
> > > > + *__format = fmt->format;
> > > > + } else {
> > > > + /* Restore the original pad format code */
> > > > + fmt->format.code = code;
> > > > + __format->code = code;
> > > > + __format->width = fmt->format.width;
> > > > + __format->height = fmt->format.height;
> > > > + }
> > > > +
> > > > + mutex_unlock(&xcsi2rxss->lock);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/**
> > > > + * xcsi2rxss_open - Called on v4l2_open()
> > > > + * @sd: Pointer to V4L2 sub device structure
> > > > + * @fh: Pointer to V4L2 File handle
> > > > + *
> > > > + * This function is called on v4l2_open(). It sets the default format
> > > > + * for both pads.
> > > > + *
> > > > + * Return: 0 on success
> > > > + */
> > > > +static int xcsi2rxss_open(struct v4l2_subdev *sd,
> > > > + struct v4l2_subdev_fh *fh)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > > + struct v4l2_mbus_framefmt *format;
> > > > + unsigned int i;
> > > > +
> > > > + for (i = 0; i < XCSI_MEDIA_PADS; i++) {
> > > > + format = v4l2_subdev_get_try_format(sd, fh->pad, i);
> > > > + *format = xcsi2rxss->format;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/* -----------------------------------------------------------------------------
> > > > + * Media Operations
> > > > + */
> > > > +
> > > > +static const struct media_entity_operations xcsi2rxss_media_ops = {
> > > > + .link_validate = v4l2_subdev_link_validate
> > > > +};
> > > > +
> > > > +static const struct v4l2_ctrl_ops xcsi2rxss_ctrl_ops = {
> > > > + .g_volatile_ctrl = xcsi2rxss_g_volatile_ctrl,
> > > > + .s_ctrl = xcsi2rxss_s_ctrl
> > > > +};
> > > > +
> > > > +static struct v4l2_ctrl_config xcsi2rxss_ctrls[] = {
> > > > + {
> > > > + .ops = &xcsi2rxss_ctrl_ops,
> > > > + .id = V4L2_CID_XILINX_MIPICSISS_ACT_LANES,
> > > > + .name = "Active Lanes",
> > > > + .type = V4L2_CTRL_TYPE_INTEGER,
> > > > + .min = 1,
> > > > + .max = 4,
> > > > + .step = 1,
> > > > + .def = 1,
> > > > + }, {
> > > > + .ops = &xcsi2rxss_ctrl_ops,
> > > > + .id = V4L2_CID_XILINX_MIPICSISS_FRAME_COUNTER,
> > > > + .name = "Frames Received Counter",
> > > > + .type = V4L2_CTRL_TYPE_INTEGER,
> > > > + .min = 0,
> > > > + .max = 0xFFFFFFFF,
> > > > + .step = 1,
> > > > + .def = 0,
> > > > + .flags = V4L2_CTRL_FLAG_VOLATILE |
> > > V4L2_CTRL_FLAG_READ_ONLY,
> > > > + }, {
> > > > + .ops = &xcsi2rxss_ctrl_ops,
> > > > + .id = V4L2_CID_XILINX_MIPICSISS_RESET_COUNTERS,
> > > > + .name = "Reset Counters",
> > > > + .type = V4L2_CTRL_TYPE_BUTTON,
> > > > + .min = 0,
> > > > + .max = 1,
> > > > + .step = 1,
> > > > + .def = 0,
> > > > + .flags = V4L2_CTRL_FLAG_WRITE_ONLY,
> > > > + }
> > > > +};
> > > > +
> > > > +static const struct v4l2_subdev_core_ops xcsi2rxss_core_ops = {
> > > > + .log_status = xcsi2rxss_log_status,
> > > > + .subscribe_event = xcsi2rxss_subscribe_event,
> > > > + .unsubscribe_event = xcsi2rxss_unsubscribe_event
> > > > +};
> > > > +
> > > > +static struct v4l2_subdev_video_ops xcsi2rxss_video_ops = {
> > > > + .s_stream = xcsi2rxss_s_stream
> > > > +};
> > > > +
> > > > +static struct v4l2_subdev_pad_ops xcsi2rxss_pad_ops = {
> > > > + .get_fmt = xcsi2rxss_get_format,
> > > > + .set_fmt = xcsi2rxss_set_format,
> > > > +};
> > > > +
> > > > +static struct v4l2_subdev_ops xcsi2rxss_ops = {
> > > > + .core = &xcsi2rxss_core_ops,
> > > > + .video = &xcsi2rxss_video_ops,
> > > > + .pad = &xcsi2rxss_pad_ops
> > > > +};
> > > > +
> > > > +static const struct v4l2_subdev_internal_ops xcsi2rxss_internal_ops = {
> > > > + .open = xcsi2rxss_open,
> > > > +};
> > > > +
> > > > +static void xcsi2rxss_set_default_format(struct xcsi2rxss_state *state)
> > > > +{
> > > > + struct xcsi2rxss_core *core = &state->core;
> > > > +
> > > > + memset(&state->format, 0, sizeof(state->format));
> > > > +
> > > > + switch (core->datatype) {
> > > > + case XCSI_DT_YUV4228B:
> > > > + case XCSI_DT_YUV42210B:
> > >
> > > As mentioned before, does this belong here? It looks like 10bit format,
> > > but is classified as 8bit bus format.
> > >
> >
> > I will remove this 10bit format. Xilinx YUV422 10bpc on AXI4 Stream isn't
> represented by any of the MEDIA_BUS_FMT_*.
> >
> > > > + state->format.code = MEDIA_BUS_FMT_UYVY8_1X16;
> > > > + break;
> > > > + case XCSI_DT_RGB888:
> > > > + state->format.code = MEDIA_BUS_FMT_RBG888_1X24;
> > > > + break;
> > > > + case XCSI_DT_RAW10:
> > > > + switch (core->bayer) {
> > > > + case XCSI_BAYER_BGGR:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SBGGR10_1X10;
> > > > + break;
> > > > + case XCSI_BAYER_GRBG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGRBG10_1X10;
> > > > + break;
> > > > + case XCSI_BAYER_GBRG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGBRG10_1X10;
> > > > + break;
> > > > + case XCSI_BAYER_RGGB:
> > > > + default:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SRGGB10_1X10;
> > > > + }
> > > > + break;
> > > > + case XCSI_DT_RAW12:
> > > > + switch (core->bayer) {
> > > > + case XCSI_BAYER_BGGR:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SBGGR12_1X12;
> > > > + break;
> > > > + case XCSI_BAYER_GRBG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGRBG12_1X12;
> > > > + break;
> > > > + case XCSI_BAYER_GBRG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGBRG12_1X12;
> > > > + break;
> > > > + case XCSI_BAYER_RGGB:
> > > > + default:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SRGGB12_1X12;
> > > > + }
> > > > + break;
> > > > + case XCSI_DT_RAW14:
> > > > + switch (core->bayer) {
> > > > + case XCSI_BAYER_BGGR:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SBGGR14_1X14;
> > > > + break;
> > > > + case XCSI_BAYER_GRBG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGRBG14_1X14;
> > > > + break;
> > > > + case XCSI_BAYER_GBRG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGBRG14_1X14;
> > > > + break;
> > > > + case XCSI_BAYER_RGGB:
> > > > + default:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SRGGB14_1X14;
> > > > + }
> > > > + break;
> > > > + case XCSI_DT_RAW16:
> > > > + switch (core->bayer) {
> > > > + case XCSI_BAYER_BGGR:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SBGGR16_1X16;
> > > > + break;
> > > > + case XCSI_BAYER_GRBG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGRBG16_1X16;
> > > > + break;
> > > > + case XCSI_BAYER_GBRG:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SGBRG16_1X16;
> > > > + break;
> > > > + case XCSI_BAYER_RGGB:
> > > > + default:
> > > > + state->format.code =
> > > MEDIA_BUS_FMT_SRGGB16_1X16;
> > > > + }
> > > > + break;
> > > > + case XCSI_DT_RAW8:
> > > > + case XCSI_DT_RGB444:
> > > > + case XCSI_DT_RGB555:
> > > > + case XCSI_DT_RGB565:
> > > > + case XCSI_DT_RGB666:
> > > > + switch (core->bayer) {
> > > > + case XCSI_BAYER_BGGR:
> > > > + state->format.code = MEDIA_BUS_FMT_SBGGR8_1X8;
> > > > + break;
> > > > + case XCSI_BAYER_GRBG:
> > > > + state->format.code = MEDIA_BUS_FMT_SGRBG8_1X8;
> > > > + break;
> > > > + case XCSI_BAYER_GBRG:
> > > > + state->format.code = MEDIA_BUS_FMT_SGBRG8_1X8;
> > > > + break;
> > > > + case XCSI_BAYER_RGGB:
> > > > + default:
> > > > + state->format.code = MEDIA_BUS_FMT_SRGGB8_1X8;
> > > > + }
> > > > + break;
> > > > + }
> > > > +
> > > > + state->format.field = V4L2_FIELD_NONE;
> > > > + state->format.colorspace = V4L2_COLORSPACE_SRGB;
> > > > + state->format.width = XCSI_DEFAULT_WIDTH;
> > > > + state->format.height = XCSI_DEFAULT_HEIGHT;
> > > > +
> > > > + dev_dbg(core->dev, "default mediabus format = 0x%x",
> > > > + state->format.code);
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_clk_get(struct xcsi2rxss_core *core)
> > > > +{
> > > > + int ret;
> > > > +
> > > > + core->lite_aclk = devm_clk_get(core->dev, "lite_aclk");
> > > > + if (IS_ERR(core->lite_aclk)) {
> > > > + ret = PTR_ERR(core->lite_aclk);
> > > > + dev_err(core->dev, "failed to get lite_aclk (%d)\n",
> > > > + ret);
> > > > + return ret;
> > > > + }
> > > > +
> > > > + core->video_aclk = devm_clk_get(core->dev, "video_aclk");
> > > > + if (IS_ERR(core->video_aclk)) {
> > > > + ret = PTR_ERR(core->video_aclk);
> > > > + dev_err(core->dev, "failed to get video_aclk (%d)\n",
> > > > + ret);
> > > > + return ret;
> > > > + }
> > > > +
> > > > + core->dphy_clk_200M = devm_clk_get(core->dev, "dphy_clk_200M");
> > > > + if (IS_ERR(core->dphy_clk_200M)) {
> > > > + ret = PTR_ERR(core->dphy_clk_200M);
> > > > + dev_err(core->dev, "failed to get dphy_clk_200M (%d)\n",
> > > > + ret);
> > > > + return ret;
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "Got all clocks!\n");
> > >
> > > This debug print doesn't add any, but it's fine if you want to keep.
> >
> > I will remove in next version. It is more of trace print than debug.
> >
> > >
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_clk_enable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + unsigned long rate;
> > > > + int ret;
> > > > +
> > > > + ret = clk_prepare_enable(core->lite_aclk);
> > > > + if (ret) {
> > > > + dev_err(core->dev, "failed enabling lite_aclk (%d)\n",
> > > > + ret);
> > > > + return ret;
> > > > + }
> > > > +
> > > > + ret = clk_prepare_enable(core->video_aclk);
> > > > + if (ret) {
> > > > + dev_err(core->dev, "failed enabling video_aclk (%d)\n",
> > > > + ret);
> > > > + goto err_vidclk;
> > > > + }
> > > > +
> > > > + ret = clk_prepare_enable(core->dphy_clk_200M);
> > > > + if (ret) {
> > > > + dev_err(core->dev, "failed enabling dphy clk (%d)\n",
> > > > + ret);
> > > > + goto err_dphyclk;
> > > > + }
> > > > +
> > > > + ret = clk_set_rate(core->dphy_clk_200M, XCSI_DPHY_CLK_REQ);
> > > > + if (ret) {
> > > > + dev_err(core->dev, "failed to set dphy clk rate (%d)\n",
> > > > + ret);
> > > > + goto err_rate_set;
> > > > + }
> > > > +
> > > > + rate = clk_get_rate(core->dphy_clk_200M);
> > > > + if (rate < XCSI_DPHY_CLK_MIN && rate > XCSI_DPHY_CLK_MAX) {
> > >
> > > Please confirm on this range. From its name and so on, it looks like
> > > it should be 200MHz.
> >
> > This is range is confirmed from the RTL source code. The clock should be as
> close to 200MHz possible within given deviation.
> >
> > >
> > > > + dev_err(core->dev, "Err DPHY Clock = %lu\n",
> > > > + rate);
> > > > + ret = -EINVAL;
> > > > + goto err_rate_set;
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "all clocks enabled!\n");
> > > > +
> > > > + return ret;
> > > > +
> > > > +err_rate_set:
> > > > + clk_disable_unprepare(core->dphy_clk_200M);
> > > > +err_dphyclk:
> > > > + clk_disable_unprepare(core->video_aclk);
> > > > +err_vidclk:
> > > > + clk_disable_unprepare(core->lite_aclk);
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static void xcsi2rxss_clk_disable(struct xcsi2rxss_core *core)
> > > > +{
> > > > + clk_disable_unprepare(core->dphy_clk_200M);
> > > > + clk_disable_unprepare(core->video_aclk);
> > > > + clk_disable_unprepare(core->lite_aclk);
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_parse_of(struct xcsi2rxss_state *xcsi2rxss)
> > > > +{
> > > > + struct xcsi2rxss_core *core = &xcsi2rxss->core;
> > > > + struct device_node *node = xcsi2rxss->core.dev->of_node;
> > > > + struct device_node *ports = NULL;
> > > > + struct device_node *port = NULL;
> > > > + unsigned int nports;
> > > > + int ret;
> > > > +
> > > > + core->en_csi_v20 = of_property_read_bool(node, "xlnx,en-csi-v2-0");
> > >
> > > Can't this be a local variable?
> > In its current usage, yes. I will modify this and resend in next version.
> >
> > >
> > > > + if (core->en_csi_v20) {
> > > > + core->en_vcx = of_property_read_bool(node, "xlnx,en-vcx");
> > > > + dev_dbg(core->dev, "vcx %s", core->en_vcx ? "enabled" :
> > > > + "disabled");
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "en_csi_v20 %s", core->en_csi_v20 ? "enabled" :
> > > > + "disabled");
> > > > +
> > > > + core->enable_active_lanes =
> > > > + of_property_read_bool(node, "xlnx,en-active-lanes");
> > > > + dev_dbg(core->dev, "Enable active lanes property = %s\n",
> > > > + core->enable_active_lanes ? "Present" : "Absent");
> > > > +
> > > > + ret = of_property_read_u32(node, "xlnx,csi-pxl-format",
> > > > + &core->datatype);
> > > > + if (ret < 0) {
> > > > + dev_err(core->dev, "missing xlnx,csi-pxl-format property\n");
> > > > + return ret;
> > > > + }
> > > > +
> > > > + ret = 0;
> > >
> > > I think this line is not needed.
> >
> > Ok. I will remove it in next version.
> >
> > >
> > > > + switch (core->datatype) {
> > > > + case XCSI_DT_YUV4228B:
> > > > + case XCSI_DT_RGB444:
> > > > + case XCSI_DT_RGB555:
> > > > + case XCSI_DT_RGB565:
> > > > + case XCSI_DT_RGB666:
> > > > + case XCSI_DT_RGB888:
> > > > + case XCSI_DT_RAW6:
> > > > + case XCSI_DT_RAW7:
> > > > + case XCSI_DT_RAW8:
> > > > + case XCSI_DT_RAW10:
> > > > + case XCSI_DT_RAW12:
> > > > + case XCSI_DT_RAW14:
> > > > + break;
> > > > + case XCSI_DT_YUV42210B:
> > > > + case XCSI_DT_RAW16:
> > > > + case XCSI_DT_RAW20:
> > > > + if (!core->en_csi_v20) {
> > > > + ret = -EINVAL;
> > > > + dev_dbg(core->dev, "enable csi v2 for this pixel
> > > format");
> > > > + }
> > > > + break;
> > > > + default:
> > > > + ret = -EINVAL;
> > > > + }
> > > > +
> > > > + if (ret < 0) {
> > > > + dev_err(core->dev, "invalid csi-pxl-format property!\n");
> > > > + return ret;
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "pixel format set as 0x%x\n", core->datatype);
> > > > +
> > > > + core->vfb = of_property_read_bool(node, "xlnx,vfb");
> > >
> > > Can't this be a local variable as well?
> >
> > True. I will update it in next version.
> >
> > >
> > > > + dev_dbg(core->dev, "Video Format Bridge property = %s\n",
> > > > + core->vfb ? "Present" : "Absent");
> > > > +
> > > > + if (!core->vfb) {
> > > > + dev_err(core->dev, "failed as VFB is disabled!\n");
> > > > + return -EINVAL;
> > > > + }
> > > > +
> > > > + ports = of_get_child_by_name(node, "ports");
> > > > + if (!ports)
> > > > + ports = node;
> > > > +
> > > > + nports = 0;
> > > > + for_each_child_of_node(ports, port) {
> > > > + const char *pattern = "mono";
> > > > + int len = strlen(pattern);
> > > > + struct device_node *endpoint;
> > > > + struct v4l2_fwnode_endpoint v4lendpoint;
> > > > + int ret;
> > > > +
> > > > + if (!port->name || of_node_cmp(port->name, "port"))
> > > > + continue;
> > > > +
> > > > + endpoint = of_get_next_child(port, NULL);
> > > > + if (!endpoint) {
> > > > + dev_err(core->dev, "No port at\n");
> > > > + return -EINVAL;
> > > > + }
> > > > +
> > > > + /*
> > > > + * since first port is sink port and it contains
> > > > + * all info about data-lanes and cfa-pattern,
> > > > + * don't parse second port but only check if exists
> > > > + */
> > > > + if (nports == XVIP_PAD_SOURCE) {
> > > > + dev_dbg(core->dev, "no need to parse source port");
> > > > + nports++;
> > > > + of_node_put(endpoint);
> > > > + continue;
> > > > + }
> > > > +
> > > > + core->bayer = XCSI_BAYER_RGGB;
> > > > + ret = of_property_read_string(port, "xlnx,cfa-pattern",
> > > > + &pattern);
> > > > + if (ret == 0) {
> > >
> > > Nit. !ret.
> > >
> >
> > Will update in next version.
> >
> >
> > > > + if (!strncmp("grbg", pattern, len)) {
> > > > + core->bayer = XCSI_BAYER_GRBG;
> > > > + } else if (!strncmp("bggr", pattern, len)) {
> > > > + core->bayer = XCSI_BAYER_BGGR;
> > > > + } else if (!strncmp("rggb", pattern, len)) {
> > > > + core->bayer = XCSI_BAYER_RGGB;
> > > > + } else if (!strncmp("gbrg", pattern, len)) {
> > > > + core->bayer = XCSI_BAYER_GBRG;
> > > > + } else {
> > > > + dev_err(core->dev, "incorrect cfa string\n");
> > > > + return -EINVAL;
> > > > + }
> > > > + } else if (ret != -EINVAL) {
> > >
> > > What about for other errors?
> >
> > There are only 3 types of errors. -EINVAL means that property doesn't exist.
> > This is ok xlnx,cfa-pattern is not a required property.
> > In case it exists, then the value read should be one of those strings mentioned
> above.
> > Otherwise ret val either means that there was NULL string value for the
> property or
> > The string was not a proper null terminated string both of which mean a
> default value will be set on core->bayer.
> >
> > >
> > > > + dev_err(core->dev, "invalid cfa pattern!\n");
> > > > + return ret;
> > > > + }
> > > > + dev_dbg(core->dev, "bayer pattern = %d\n", core->bayer);
> > > > +
> > > > + ret =
> > > v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint),
> > > > + &v4lendpoint);
> > > > + of_node_put(endpoint);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + dev_dbg(core->dev, "%s : port %d bus type = %d\n",
> > > > + __func__, nports, v4lendpoint.bus_type);
> > > > +
> > > > + if (v4lendpoint.bus_type == V4L2_MBUS_CSI2_DPHY) {
> > > > + dev_dbg(core->dev, "%s : base.port = %d base.id =
> > > %d\n",
> > > > + __func__, v4lendpoint.base.port,
> > > > + v4lendpoint.base.id);
> > > > +
> > > > + dev_dbg(core->dev, "%s : mipi number lanes = %d\n",
> > > > + __func__,
> > > > + v4lendpoint.bus.mipi_csi2.num_data_lanes);
> > > > +
> > > > + core->max_num_lanes =
> > > > + v4lendpoint.bus.mipi_csi2.num_data_lanes;
> > > > + } else {
> > > > + dev_dbg(core->dev, "%s : Not a CSI2 bus\n", __func__);
> > >
> > > Not sure if this adds any info.
> >
> > Not really required. I will convert this to a comment in next revision.
> >
> > >
> > > > + }
> > > > +
> > > > + /* Count the number of ports. */
> > > > + nports++;
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "max lanes = %d", core->max_num_lanes);
> > > > +
> > > > + if (nports != XCSI_MEDIA_PADS) {
> > > > + dev_err(core->dev, "invalid number of ports %u\n", nports);
> > > > + return -EINVAL;
> > > > + }
> > > > +
> > > > + /* Register interrupt handler */
> > > > + core->irq = irq_of_parse_and_map(node, 0);
> > > > + ret = devm_request_irq(core->dev, core->irq, xcsi2rxss_irq_handler,
> > > > + IRQF_SHARED, "xilinx-csi2rxss", xcsi2rxss);
> > > > + if (ret) {
> > > > + dev_err(core->dev, "Err = %d Interrupt handler reg failed!\n",
> > > > + ret);
> > > > + return ret;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_probe(struct platform_device *pdev)
> > > > +{
> > > > + struct v4l2_subdev *subdev;
> > > > + struct xcsi2rxss_state *xcsi2rxss;
> > > > + struct xcsi2rxss_core *core;
> > > > + struct resource *res;
> > > > + int ret, num_ctrls, i;
> > > > +
> > > > + xcsi2rxss = devm_kzalloc(&pdev->dev, sizeof(*xcsi2rxss), GFP_KERNEL);
> > > > + if (!xcsi2rxss)
> > > > + return -ENOMEM;
> > > > +
> > > > + core = &xcsi2rxss->core;
> > > > + core->dev = &pdev->dev;
> > > > +
> > > > + mutex_init(&xcsi2rxss->lock);
> > > > +
> > > > + ret = xcsi2rxss_parse_of(xcsi2rxss);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > > + core->iomem = devm_ioremap_resource(core->dev, res);
> > > > + if (IS_ERR(core->iomem))
> > > > + return PTR_ERR(core->iomem);
> > > > +
> > > > + ret = xcsi2rxss_clk_get(core);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > + ret = xcsi2rxss_clk_enable(core);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > + xcsi2rxss_reset(core);
> > > > +
> > > > + core->events = (struct xcsi2rxss_event *)&xcsi2rxss_events;
> > > > +
> > > > + if (core->en_vcx) {
> > > > + u32 alloc_size;
> > > > +
> > > > + alloc_size = sizeof(struct xcsi2rxss_event) *
> > > > + XCSI_VCX_NUM_EVENTS;
> > > > + core->vcx_events = devm_kzalloc(&pdev->dev, alloc_size,
> > > > + GFP_KERNEL);
> > > > + if (!core->vcx_events) {
> > > > + mutex_destroy(&xcsi2rxss->lock);
> > > > + ret = -ENOMEM;
> > > > + goto all_clk_err;
> > > > + }
> > > > +
> > > > + for (i = 0; i < XCSI_VCX_NUM_EVENTS; i++)
> > > > + core->vcx_events[i].mask = 1 << i;
> > > > + }
> > > > +
> > > > + /* Initialize V4L2 subdevice and media entity */
> > > > + xcsi2rxss->pads[XVIP_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> > > > + xcsi2rxss->pads[XVIP_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
> > > > +
> > > > + /* Initialize the default format */
> > > > + xcsi2rxss_set_default_format(xcsi2rxss);
> > > > +
> > > > + /* Initialize V4L2 subdevice and media entity */
> > > > + subdev = &xcsi2rxss->subdev;
> > > > + v4l2_subdev_init(subdev, &xcsi2rxss_ops);
> > > > + subdev->dev = &pdev->dev;
> > > > + subdev->internal_ops = &xcsi2rxss_internal_ops;
> > > > + strlcpy(subdev->name, dev_name(&pdev->dev), sizeof(subdev->name));
> > > > + subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS |
> > > V4L2_SUBDEV_FL_HAS_DEVNODE;
> > > > + subdev->entity.ops = &xcsi2rxss_media_ops;
> > > > + v4l2_set_subdevdata(subdev, xcsi2rxss);
> > > > +
> > > > + ret = media_entity_pads_init(&subdev->entity, XCSI_MEDIA_PADS,
> > > > + xcsi2rxss->pads);
> > > > + if (ret < 0)
> > > > + goto error;
> > > > +
> > > > + /*
> > > > + * In case the Enable Active Lanes config parameter is not set,
> > > > + * dynamic lane reconfiguration is not allowed.
> > > > + * So V4L2_CID_XILINX_MIPICSISS_ACT_LANES ctrl will not be
> > > registered.
> > > > + * Accordingly allocate the number of controls
> > > > + */
> > > > + num_ctrls = ARRAY_SIZE(xcsi2rxss_ctrls);
> > > > +
> > > > + if (!core->enable_active_lanes)
> > > > + num_ctrls--;
> > > > +
> > > > + dev_dbg(core->dev, "# of ctrls = %d\n", num_ctrls);
> > > > +
> > > > + v4l2_ctrl_handler_init(&xcsi2rxss->ctrl_handler, num_ctrls);
> > > > + for (i = 0; i < ARRAY_SIZE(xcsi2rxss_ctrls); i++) {
> > > > + struct v4l2_ctrl *ctrl;
> > > > +
> > > > + if (xcsi2rxss_ctrls[i].id ==
> > > > + V4L2_CID_XILINX_MIPICSISS_ACT_LANES) {
> > > > + if (!core->enable_active_lanes) {
> > > > + /* Don't register control */
> > > > + dev_dbg(core->dev,
> > > > + "Skip active lane control\n");
> > > > + continue;
> > >
> > > This active lane control is not even registered, so the control handler
> > > doesn't even have to check this flag. But I guess it doesn't hurt to
> > > keep the check in the handler, so I let you decide.
> > >
> >
> > It wasn't there in the first patch version. But based on suggestion added this, I
> think it would be good to keep the check.
> >
> > > > + }
> > > > + xcsi2rxss_ctrls[i].max = core->max_num_lanes;
> > > > + xcsi2rxss_ctrls[i].def = core->max_num_lanes;
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "%d ctrl = 0x%x\n", i,
> > > > + xcsi2rxss_ctrls[i].id);
> > > > + ctrl = v4l2_ctrl_new_custom(&xcsi2rxss->ctrl_handler,
> > > > + &xcsi2rxss_ctrls[i], NULL);
> > > > + if (!ctrl) {
> > > > + dev_err(core->dev, "Failed for %s ctrl\n",
> > > > + xcsi2rxss_ctrls[i].name);
> > > > + goto error;
> > > > + }
> > > > + }
> > > > +
> > > > + dev_dbg(core->dev, "# v4l2 ctrls registered = %d\n", i - 1);
> > > > +
> > > > + if (xcsi2rxss->ctrl_handler.error) {
> > > > + dev_err(core->dev, "failed to add controls\n");
> > > > + ret = xcsi2rxss->ctrl_handler.error;
> > > > + goto error;
> > > > + }
> > > > +
> > > > + subdev->ctrl_handler = &xcsi2rxss->ctrl_handler;
> > > > + ret = v4l2_ctrl_handler_setup(&xcsi2rxss->ctrl_handler);
> > > > + if (ret < 0) {
> > > > + dev_err(core->dev, "failed to set controls\n");
> > > > + goto error;
> > > > + }
> > > > +
> > > > + platform_set_drvdata(pdev, xcsi2rxss);
> > > > +
> > > > + ret = v4l2_async_register_subdev(subdev);
> > > > + if (ret < 0) {
> > > > + dev_err(core->dev, "failed to register subdev\n");
> > > > + goto error;
> > > > + }
> > > > +
> > > > + dev_info(core->dev, "Xilinx CSI2 Rx Subsystem device found!\n");
> > > > + return 0;
> > >
> > > Just a nit. I'd add en empty line.
> >
> > Ok. Will add empty line here.
> >
> > >
> > > > +error:
> > > > + v4l2_ctrl_handler_free(&xcsi2rxss->ctrl_handler);
> > > > + media_entity_cleanup(&subdev->entity);
> > > > + mutex_destroy(&xcsi2rxss->lock);
> > > > +all_clk_err:
> > > > + xcsi2rxss_clk_disable(core);
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static int xcsi2rxss_remove(struct platform_device *pdev)
> > > > +{
> > > > + struct xcsi2rxss_state *xcsi2rxss = platform_get_drvdata(pdev);
> > > > + struct xcsi2rxss_core *core = &xcsi2rxss->core;
> > > > + struct v4l2_subdev *subdev = &xcsi2rxss->subdev;
> > > > +
> > > > + v4l2_async_unregister_subdev(subdev);
> > > > + v4l2_ctrl_handler_free(&xcsi2rxss->ctrl_handler);
> > > > + media_entity_cleanup(&subdev->entity);
> > > > + mutex_destroy(&xcsi2rxss->lock);
> > > > + xcsi2rxss_clk_disable(core);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static struct platform_driver xcsi2rxss_driver = {
> > > > + .driver = {
> > > > + .name = "xilinx-csi2rxss",
> > > > + .of_match_table = xcsi2rxss_of_id_table,
> > > > + },
> > > > + .probe = xcsi2rxss_probe,
> > > > + .remove = xcsi2rxss_remove,
> > > > +};
> > > > +
> > > > +module_platform_driver(xcsi2rxss_driver);
> > > > +
> > > > +MODULE_AUTHOR("Vishal Sagar <vsagar@xxxxxxxxxx>");
> > > > +MODULE_DESCRIPTION("Xilinx MIPI CSI2 Rx Subsystem Driver");
> > > > +MODULE_LICENSE("GPL v2");
> > > > diff --git a/include/uapi/linux/xilinx-v4l2-controls.h
> > > b/include/uapi/linux/xilinx-v4l2-controls.h
> > > > index b6441fe..4ca3b44 100644
> > > > --- a/include/uapi/linux/xilinx-v4l2-controls.h
> > > > +++ b/include/uapi/linux/xilinx-v4l2-controls.h
> > > > @@ -71,4 +71,18 @@
> > > > /* Noise level */
> > > > #define V4L2_CID_XILINX_TPG_NOISE_GAIN
> > > (V4L2_CID_XILINX_TPG + 17)
> > > >
> > > > +/*
> > > > + * Xilinx MIPI CSI2 Rx Subsystem
> > > > + */
> > > > +
> > > > +/* Base ID */
> > > > +#define V4L2_CID_XILINX_MIPICSISS (V4L2_CID_USER_BASE +
> > > 0xc080)
> > > > +
> > > > +/* Active Lanes */
> > > > +#define V4L2_CID_XILINX_MIPICSISS_ACT_LANES
> > > (V4L2_CID_XILINX_MIPICSISS + 1)
> > > > +/* Frames received since streaming is set */
> > > > +#define V4L2_CID_XILINX_MIPICSISS_FRAME_COUNTER
> > > (V4L2_CID_XILINX_MIPICSISS + 2)
> > > > +/* Reset all event counters */
> > > > +#define V4L2_CID_XILINX_MIPICSISS_RESET_COUNTERS
> > > (V4L2_CID_XILINX_MIPICSISS + 3)
> > > > +
> > > > #endif /* __UAPI_XILINX_V4L2_CONTROLS_H__ */
> > > > diff --git a/include/uapi/linux/xilinx-v4l2-events.h
> b/include/uapi/linux/xilinx-
> > > v4l2-events.h
> > > > new file mode 100644
> > > > index 0000000..2fef0b5
> > > > --- /dev/null
> > > > +++ b/include/uapi/linux/xilinx-v4l2-events.h
> > > > @@ -0,0 +1,28 @@
> > > > +/* SPDX-License-Identifier: GPL-2.0 */
> > > > +/*
> > > > + * Xilinx V4L2 Events
> > > > + *
> > > > + * Copyright (C) 2019 Xilinx, Inc.
> > > > + *
> > > > + * Contacts: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> > > > + *
> > > > + */
> > > > +
> > > > +#ifndef __UAPI_XILINX_V4L2_EVENTS_H__
> > > > +#define __UAPI_XILINX_V4L2_EVENTS_H__
> > > > +
> > > > +#include <linux/videodev2.h>
> > > > +
> > > > +/*
> > > > + * Events
> > > > + *
> > > > + * V4L2_EVENT_XLNXCSIRX_SPKT: Short packet received
> > > > + * V4L2_EVENT_XLNXCSIRX_SPKT_OVF: Short packet FIFO overflow
> > > > + * V4L2_EVENT_XLNXCSIRX_SLBF: Stream line buffer full
> > > > + */
> > >
> > > Would be better to comment inline. But up to you.
> >
> > Ok. Will do it in next version
> >
> > Regards
> > Vishal Sagar
> >
> > >
> > > Thanks,
> > > -hyun
> > >
> > > > +#define V4L2_EVENT_XLNXCSIRX_CLASS
> (V4L2_EVENT_PRIVATE_START |
> > > 0x100)
> > > > +#define V4L2_EVENT_XLNXCSIRX_SPKT (V4L2_EVENT_XLNXCSIRX_CLASS
> > > | 0x1)
> > > > +#define V4L2_EVENT_XLNXCSIRX_SPKT_OVF
> > > (V4L2_EVENT_XLNXCSIRX_CLASS | 0x2)
> > > > +#define V4L2_EVENT_XLNXCSIRX_SLBF (V4L2_EVENT_XLNXCSIRX_CLASS
> > > | 0x3)
> > > > +
> > > > +#endif /* __UAPI_XILINX_V4L2_EVENTS_H__ */
> > > > --
> > > > 2.7.4
> > > >
> > > >
> >

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