Re: [PATCH v2 2/2] media: v4l: xilinx: Add Xilinx UHD-SDI Rx Subsystem driver

[Hyun Kwon]

Hi Vishal,

Thanks for the patch. Sorry for late reply.

On Wed, 2020-04-29 at 07:17:04 -0700, Vishal Sagar wrote:
> The Xilinx UHD-SDI Rx subsystem soft IP is used to capture native SDI
> streams from SDI sources like SDI broadcast equipment like cameras and
> mixers. This block outputs either native SDI, native video or
> AXI4-Stream compliant data stream for further processing. Please refer
> to PG290 for details.
> 
> The driver is used to configure the IP to add framer, search for
> specific modes, get the detected mode, stream parameters, errors, etc.
> It also generates events for video lock/unlock, bridge over/under flow.
> 
> The driver supports 10/12 bpc YUV 422 media bus format currently. It also
> decodes the stream parameters based on the ST352 packet embedded in the
> stream. In case the ST352 packet isn't present in the stream, the core's
> detected properties are used to set stream properties.
> 
> The driver currently supports only the AXI4-Stream IP configuration.
> 
> Signed-off-by: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> ---
> v2
> - Added DV timing support based on Hans VerkuilÅ feedback
> - More documentation to custom v4l controls and events
> - Fixed HyunÅ comments
> - Added macro for masking and shifting as per Joe Perches comments
> - Updated to latest as per Xilinx github repo driver like
>   adding new DV timings not in mainline yet uptill 03/21/20
> 
>  drivers/media/platform/xilinx/Kconfig         |   11 +
>  drivers/media/platform/xilinx/Makefile        |    1 +
>  .../media/platform/xilinx/xilinx-sdirxss.c    | 2162 +++++++++++++++++
>  include/uapi/linux/xilinx-sdirxss.h           |  179 ++
>  include/uapi/linux/xilinx-v4l2-controls.h     |   67 +
>  5 files changed, 2420 insertions(+)
>  create mode 100644 drivers/media/platform/xilinx/xilinx-sdirxss.c
>  create mode 100644 include/uapi/linux/xilinx-sdirxss.h
> 
> diff --git a/drivers/media/platform/xilinx/Kconfig b/drivers/media/platform/xilinx/Kconfig
> index 01c96fb66414..77091318a9c9 100644
> --- a/drivers/media/platform/xilinx/Kconfig
> +++ b/drivers/media/platform/xilinx/Kconfig
> @@ -12,6 +12,17 @@ config VIDEO_XILINX
>  
>  if VIDEO_XILINX
>  
> +config VIDEO_XILINX_SDIRXSS
> +	tristate "Xilinx UHD SDI Rx Subsystem"
> +	help
> +	  Driver for Xilinx UHD-SDI Rx Subsystem. This is a V4L sub-device
> +	  based driver that takes input from a SDI source like SDI camera and
> +	  converts it into an AXI4-Stream. The subsystem comprises of a SMPTE
> +	  UHD-SDI Rx core, a SDI Rx to Native Video bridge and a Video In to
> +	  AXI4-Stream bridge. The driver is used to set different stream
> +	  detection modes and identify stream properties to properly configure
> +	  downstream.
> +
>  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 4cdc0b1ec7a5..6c375f03f587 100644
> --- a/drivers/media/platform/xilinx/Makefile
> +++ b/drivers/media/platform/xilinx/Makefile
> @@ -2,6 +2,7 @@
>  
>  xilinx-video-objs += xilinx-dma.o xilinx-vip.o xilinx-vipp.o
>  
> +obj-$(CONFIG_VIDEO_XILINX_SDIRXSS) += xilinx-sdirxss.o

This better come after CONFIG_VIDEO_XILINX.

>  obj-$(CONFIG_VIDEO_XILINX) += xilinx-video.o
>  obj-$(CONFIG_VIDEO_XILINX_TPG) += xilinx-tpg.o
>  obj-$(CONFIG_VIDEO_XILINX_VTC) += xilinx-vtc.o
> diff --git a/drivers/media/platform/xilinx/xilinx-sdirxss.c b/drivers/media/platform/xilinx/xilinx-sdirxss.c
> new file mode 100644
> index 000000000000..c536ea3aaa0d
> --- /dev/null
> +++ b/drivers/media/platform/xilinx/xilinx-sdirxss.c
> @@ -0,0 +1,2162 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Driver for Xilinx SDI Rx Subsystem
> + *
> + * Copyright (C) 2017 - 2020 Xilinx, Inc.
> + *
> + * Contacts: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> + *
> + */
> +
> +#include <dt-bindings/media/xilinx-vip.h>
> +#include <linux/bitops.h>
> +#include <linux/compiler.h>

Is this needed? Maybe unused ones can be removed.

> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/spinlock_types.h>
> +#include <linux/types.h>
> +#include <linux/v4l2-dv-timings.h>
> +#include <linux/v4l2-subdev.h>
> +#include <linux/xilinx-sdirxss.h>
> +#include <linux/xilinx-v4l2-controls.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"
> +
> +/*
> + * SDI Rx register map, bitmask and offsets
> + */
> +#define XSDIRX_RST_CTRL_REG		0x00
> +#define XSDIRX_MDL_CTRL_REG		0x04
> +#define XSDIRX_GLBL_IER_REG		0x0C
> +#define XSDIRX_ISR_REG			0x10
> +#define XSDIRX_IER_REG			0x14
> +#define XSDIRX_ST352_VALID_REG		0x18
> +#define XSDIRX_ST352_DS1_REG		0x1C
> +#define XSDIRX_ST352_DS3_REG		0x20
> +#define XSDIRX_ST352_DS5_REG		0x24
> +#define XSDIRX_ST352_DS7_REG		0x28
> +#define XSDIRX_ST352_DS9_REG		0x2C
> +#define XSDIRX_ST352_DS11_REG		0x30
> +#define XSDIRX_ST352_DS13_REG		0x34
> +#define XSDIRX_ST352_DS15_REG		0x38
> +#define XSDIRX_VERSION_REG		0x3C
> +#define XSDIRX_SS_CONFIG_REG		0x40
> +#define XSDIRX_MODE_DET_STAT_REG	0x44
> +#define XSDIRX_TS_DET_STAT_REG		0x48
> +#define XSDIRX_EDH_STAT_REG		0x4C
> +#define XSDIRX_EDH_ERRCNT_EN_REG	0x50
> +#define XSDIRX_EDH_ERRCNT_REG		0x54
> +#define XSDIRX_CRC_ERRCNT_REG		0x58
> +#define XSDIRX_VID_LOCK_WINDOW_REG	0x5C
> +#define XSDIRX_SB_RX_STS_REG		0x60
> +
> +#define XSDIRX_RST_CTRL_SS_EN_MASK			BIT(0)
> +#define XSDIRX_RST_CTRL_SRST_MASK			BIT(1)
> +#define XSDIRX_RST_CTRL_RST_CRC_ERRCNT_MASK		BIT(2)
> +#define XSDIRX_RST_CTRL_RST_EDH_ERRCNT_MASK		BIT(3)
> +#define XSDIRX_RST_CTRL_SDIRX_BRIDGE_ENB_MASK		BIT(8)
> +#define XSDIRX_RST_CTRL_VIDIN_AXI4S_MOD_ENB_MASK	BIT(9)
> +#define XSDIRX_RST_CTRL_BRIDGE_CH_FMT_OFFSET		10
> +#define XSDIRX_RST_CTRL_BRIDGE_CH_FMT_MASK		GENMASK(12, 10)
> +#define XSDIRX_RST_CTRL_BRIDGE_CH_FMT_YUV444		1
> +
> +#define XSDIRX_MDL_CTRL_FRM_EN_MASK		BIT(4)
> +#define XSDIRX_MDL_CTRL_MODE_DET_EN_MASK	BIT(5)
> +#define XSDIRX_MDL_CTRL_MODE_HD_EN_MASK		BIT(8)
> +#define XSDIRX_MDL_CTRL_MODE_SD_EN_MASK		BIT(9)
> +#define XSDIRX_MDL_CTRL_MODE_3G_EN_MASK		BIT(10)
> +#define XSDIRX_MDL_CTRL_MODE_6G_EN_MASK		BIT(11)
> +#define XSDIRX_MDL_CTRL_MODE_12GI_EN_MASK	BIT(12)
> +#define XSDIRX_MDL_CTRL_MODE_12GF_EN_MASK	BIT(13)
> +#define XSDIRX_MDL_CTRL_MODE_AUTO_DET_MASK	GENMASK(13, 8)
> +
> +#define XSDIRX_MDL_CTRL_FORCED_MODE_OFFSET	16
> +#define XSDIRX_MDL_CTRL_FORCED_MODE_MASK	GENMASK(18, 16)
> +
> +#define XSDIRX_GLBL_INTR_EN_MASK	BIT(0)
> +
> +#define XSDIRX_INTR_VIDLOCK_MASK	BIT(0)
> +#define XSDIRX_INTR_VIDUNLOCK_MASK	BIT(1)
> +#define XSDIRX_INTR_OVERFLOW_MASK	BIT(9)
> +#define XSDIRX_INTR_UNDERFLOW_MASK	BIT(10)
> +
> +#define XSDIRX_INTR_ALL_MASK	(XSDIRX_INTR_VIDLOCK_MASK |\
> +				XSDIRX_INTR_VIDUNLOCK_MASK |\
> +				XSDIRX_INTR_OVERFLOW_MASK |\
> +				XSDIRX_INTR_UNDERFLOW_MASK)
> +
> +#define XSDIRX_ST352_VALID_DS1_MASK	BIT(0)
> +#define XSDIRX_ST352_VALID_DS3_MASK	BIT(1)
> +#define XSDIRX_ST352_VALID_DS5_MASK	BIT(2)
> +#define XSDIRX_ST352_VALID_DS7_MASK	BIT(3)
> +#define XSDIRX_ST352_VALID_DS9_MASK	BIT(4)
> +#define XSDIRX_ST352_VALID_DS11_MASK	BIT(5)
> +#define XSDIRX_ST352_VALID_DS13_MASK	BIT(6)
> +#define XSDIRX_ST352_VALID_DS15_MASK	BIT(7)
> +
> +#define XSDIRX_MODE_DET_STAT_RX_MODE_MASK	GENMASK(2, 0)
> +#define XSDIRX_MODE_DET_STAT_MODE_LOCK_MASK	BIT(3)
> +#define XSDIRX_MODE_DET_STAT_ACT_STREAM_MASK	GENMASK(6, 4)
> +#define XSDIRX_MODE_DET_STAT_ACT_STREAM_OFFSET	4
> +#define XSDIRX_MODE_DET_STAT_LVLB_3G_MASK	BIT(7)
> +
> +#define XSDIRX_TS_DET_STAT_LOCKED_MASK		BIT(0)
> +#define XSDIRX_TS_DET_STAT_SCAN_MASK		BIT(1)
> +#define XSDIRX_TS_DET_STAT_SCAN_OFFSET		(1)
> +#define XSDIRX_TS_DET_STAT_FAMILY_MASK		GENMASK(7, 4)
> +#define XSDIRX_TS_DET_STAT_FAMILY_OFFSET	(4)
> +#define XSDIRX_TS_DET_STAT_RATE_MASK		GENMASK(11, 8)
> +#define XSDIRX_TS_DET_STAT_RATE_OFFSET		(8)
> +
> +#define XSDIRX_TS_DET_STAT_RATE_NONE		0x0
> +#define XSDIRX_TS_DET_STAT_RATE_23_98HZ		0x2
> +#define XSDIRX_TS_DET_STAT_RATE_24HZ		0x3
> +#define XSDIRX_TS_DET_STAT_RATE_47_95HZ		0x4
> +#define XSDIRX_TS_DET_STAT_RATE_25HZ		0x5
> +#define XSDIRX_TS_DET_STAT_RATE_29_97HZ		0x6
> +#define XSDIRX_TS_DET_STAT_RATE_30HZ		0x7
> +#define XSDIRX_TS_DET_STAT_RATE_48HZ		0x8
> +#define XSDIRX_TS_DET_STAT_RATE_50HZ		0x9
> +#define XSDIRX_TS_DET_STAT_RATE_59_94HZ		0xA
> +#define XSDIRX_TS_DET_STAT_RATE_60HZ		0xB
> +
> +#define XSDIRX_EDH_STAT_EDH_AP_MASK	BIT(0)
> +#define XSDIRX_EDH_STAT_EDH_FF_MASK	BIT(1)
> +#define XSDIRX_EDH_STAT_EDH_ANC_MASK	BIT(2)
> +#define XSDIRX_EDH_STAT_AP_FLAG_MASK	GENMASK(8, 4)
> +#define XSDIRX_EDH_STAT_FF_FLAG_MASK	GENMASK(13, 9)
> +#define XSDIRX_EDH_STAT_ANC_FLAG_MASK	GENMASK(18, 14)
> +#define XSDIRX_EDH_STAT_PKT_FLAG_MASK	GENMASK(22, 19)
> +
> +#define XSDIRX_EDH_ERRCNT_COUNT_MASK	GENMASK(15, 0)
> +
> +#define XSDIRX_CRC_ERRCNT_COUNT_MASK	GENMASK(31, 16)
> +#define XSDIRX_CRC_ERRCNT_DS_CRC_MASK	GENMASK(15, 0)
> +
> +#define XSDIRX_VERSION_REV_MASK		GENMASK(7, 0)
> +#define XSDIRX_VERSION_PATCHID_MASK	GENMASK(11, 8)
> +#define XSDIRX_VERSION_VER_REV_MASK	GENMASK(15, 12)
> +#define XSDIRX_VERSION_VER_MIN_MASK	GENMASK(23, 16)
> +#define XSDIRX_VERSION_VER_MAJ_MASK	GENMASK(31, 24)
> +
> +#define XSDIRX_SS_CONFIG_EDH_INCLUDED_MASK		BIT(1)
> +
> +#define XSDIRX_STAT_SB_RX_TDATA_CHANGE_DONE_MASK	BIT(0)
> +#define XSDIRX_STAT_SB_RX_TDATA_CHANGE_FAIL_MASK	BIT(1)
> +#define XSDIRX_STAT_SB_RX_TDATA_GT_RESETDONE_MASK	BIT(2)
> +#define XSDIRX_STAT_SB_RX_TDATA_GT_BITRATE_MASK		BIT(3)
> +
> +#define XSDIRX_DEFAULT_WIDTH	(1920)
> +#define XSDIRX_DEFAULT_HEIGHT	(1080)
> +
> +#define XSDIRX_MAX_STR_LENGTH	16
> +
> +#define XSDIRXSS_SDI_STD_3G		0
> +#define XSDIRXSS_SDI_STD_6G		1
> +#define XSDIRXSS_SDI_STD_12G_8DS	2
> +
> +#define XSDIRX_DEFAULT_VIDEO_LOCK_WINDOW	0x3000
> +
> +#define XSDIRX_MODE_HD_MASK	0x0
> +#define XSDIRX_MODE_SD_MASK	0x1
> +#define XSDIRX_MODE_3G_MASK	0x2
> +#define XSDIRX_MODE_6G_MASK	0x4
> +#define XSDIRX_MODE_12GI_MASK	0x5
> +#define XSDIRX_MODE_12GF_MASK	0x6
> +
> +/* Maximum number of events per file handle. */
> +#define XSDIRX_MAX_EVENTS	(128)
> +
> +/* ST352 related macros */
> +#define XST352_PAYLOAD_BYTE1_MASK	0xFF
> +#define XST352_PAYLOAD_BYTE1_OFFSET	0
> +#define XST352_PAYLOAD_BYTE2_OFFSET	8
> +#define XST352_PAYLOAD_BYTE3_OFFSET	16
> +#define XST352_PAYLOAD_BYTE4_OFFSET	24
> +
> +#define XST352_BYTE1_ST292_1x720L_1_5G		0x84
> +#define XST352_BYTE1_ST292_1x1080L_1_5G		0x85
> +#define XST352_BYTE1_ST425_2008_750L_3GB	0x88
> +#define XST352_BYTE1_ST425_2008_1125L_3GA	0x89
> +#define XST352_BYTE1_ST372_DL_3GB		0x8A
> +#define XST352_BYTE1_ST372_2x720L_3GB		0x8B
> +#define XST352_BYTE1_ST372_2x1080L_3GB		0x8C
> +#define XST352_BYTE1_ST2081_10_2160L_6G		0xC0
> +#define XST352_BYTE1_ST2081_10_2_1080L_6G	0xC1
> +#define XST352_BYTE1_ST2081_10_DL_2160L_6G	0xC2
> +#define XST352_BYTE1_ST2082_10_2160L_12G	0xCE
> +
> +#define XST352_BYTE2_TS_TYPE_MASK		BIT(15)
> +#define XST352_BYTE2_TS_TYPE_OFFSET		15
> +#define XST352_BYTE2_PIC_TYPE_MASK		BIT(14)
> +#define XST352_BYTE2_PIC_TYPE_OFFSET		14
> +#define XST352_BYTE2_TS_PIC_TYPE_INTERLACED	0
> +#define XST352_BYTE2_TS_PIC_TYPE_PROGRESSIVE	1
> +
> +#define XST352_BYTE2_FPS_MASK			0xF
> +#define XST352_BYTE2_FPS_OFFSET			8
> +#define XST352_BYTE2_FPS_24F			0x2
> +#define XST352_BYTE2_FPS_24			0x3
> +#define XST352_BYTE2_FPS_48F			0x4
> +#define XST352_BYTE2_FPS_25			0x5
> +#define XST352_BYTE2_FPS_30F			0x6
> +#define XST352_BYTE2_FPS_30			0x7
> +#define XST352_BYTE2_FPS_48			0x8
> +#define XST352_BYTE2_FPS_50			0x9
> +#define XST352_BYTE2_FPS_60F			0xA
> +#define XST352_BYTE2_FPS_60			0xB
> +/* Table 4 ST 2081-10:2015 */
> +#define XST352_BYTE2_FPS_96			0xC
> +#define XST352_BYTE2_FPS_100			0xD
> +#define XST352_BYTE2_FPS_120			0xE
> +#define XST352_BYTE2_FPS_120F			0xF
> +
> +#define XST352_BYTE3_ACT_LUMA_COUNT_MASK	BIT(22)
> +#define XST352_BYTE3_ACT_LUMA_COUNT_OFFSET	22
> +
> +#define XST352_BYTE3_COLOR_FORMAT_MASK		GENMASK(19, 16)
> +#define XST352_BYTE3_COLOR_FORMAT_OFFSET	16
> +#define XST352_BYTE3_COLOR_FORMAT_422		0x0
> +#define XST352_BYTE3_COLOR_FORMAT_YUV444	0x1
> +#define XST352_BYTE3_COLOR_FORMAT_420		0x3
> +#define XST352_BYTE3_COLOR_FORMAT_GBR		0x2
> +
> +#define XST352_BYTE4_BIT_DEPTH_MASK		GENMASK(25, 24)
> +#define XST352_BYTE4_BIT_DEPTH_OFFSET		24
> +#define XST352_BYTE4_BIT_DEPTH_10		0x1
> +#define XST352_BYTE4_BIT_DEPTH_12		0x2
> +
> +#define CLK_INT		148500000UL

A comment for this would be helpful.

> +
> +#define rshift_and_mask(val, type) \
> +		(((val) >> type##_OFFSET) & type##_MASK)
> +
> +#define mask_and_rshift(val, type) \
> +		(((val) & type##_MASK) >> type##_OFFSET)
> +
> +/**
> + * enum sdi_family_enc - SDI Transport Video Format Detected with Active Pixels
> + * @XSDIRX_SMPTE_ST_274: SMPTE ST 274 detected with AP 1920x1080
> + * @XSDIRX_SMPTE_ST_296: SMPTE ST 296 detected with AP 1280x720
> + * @XSDIRX_SMPTE_ST_2048_2: SMPTE ST 2048-2 detected with AP 2048x1080
> + * @XSDIRX_SMPTE_ST_295: SMPTE ST 295 detected with AP 1920x1080
> + * @XSDIRX_NTSC: NTSC encoding detected with AP 720x486
> + * @XSDIRX_PAL: PAL encoding detected with AP 720x576
> + * @XSDIRX_TS_UNKNOWN: Unknown SMPTE Transport family type
> + */
> +enum sdi_family_enc {
> +	XSDIRX_SMPTE_ST_274	= 0,
> +	XSDIRX_SMPTE_ST_296	= 1,
> +	XSDIRX_SMPTE_ST_2048_2	= 2,
> +	XSDIRX_SMPTE_ST_295	= 3,
> +	XSDIRX_NTSC		= 8,
> +	XSDIRX_PAL		= 9,
> +	XSDIRX_TS_UNKNOWN	= 15
> +};
> +
> +/**
> + * struct xsdirxss_core - Core configuration SDI Rx Subsystem device structure
> + * @dev: Platform structure
> + * @iomem: Base address of subsystem
> + * @irq: requested irq number
> + * @include_edh: EDH processor presence
> + * @mode: 3G/6G/12G mode
> + * @clks: array of clocks
> + * @num_clks: number of clocks
> + * @bpc: Bits per component, can be 10 or 12
> + */
> +struct xsdirxss_core {
> +	struct device *dev;
> +	void __iomem *iomem;
> +	int irq;

I don't think this has to be stored.

> +	bool include_edh;
> +	int mode;

unsigned type?

> +	struct clk_bulk_data *clks;
> +	int num_clks;

unsigned type?

> +	u32 bpc;
> +};
> +
> +/**
> + * struct xsdirxss_state - SDI Rx Subsystem device structure
> + * @core: Core structure for MIPI SDI Rx Subsystem
> + * @subdev: The v4l2 subdev structure
> + * @ctrl_handler: control handler
> + * @event: Holds the video unlock event
> + * @format: Active V4L2 format on source pad
> + * @default_format: default V4L2 media bus format
> + * @frame_interval: Captures the frame rate
> + * @pad: source media pad
> + * @vidlockwin: Video lock window value set by control
> + * @edhmask: EDH mask set by control
> + * @searchmask: Search mask set by control
> + * @streaming: Flag for storing streaming state
> + * @vidlocked: Flag indicating SDI Rx has locked onto video stream
> + * @ts_is_interlaced: Flag indicating Transport Stream is interlaced.
> + * @framer_enable: Flag for framer enabled or not set by control
> + *
> + * This structure contains the device driver related parameters
> + */
> +struct xsdirxss_state {
> +	struct xsdirxss_core core;
> +	struct v4l2_subdev subdev;
> +	struct v4l2_ctrl_handler ctrl_handler;
> +	struct v4l2_event event;
> +	struct v4l2_mbus_framefmt format;
> +	struct v4l2_mbus_framefmt default_format;
> +	struct v4l2_fract frame_interval;
> +	struct media_pad pad;
> +	u32 vidlockwin;
> +	u32 edhmask;
> +	u16 searchmask;
> +	bool streaming;
> +	bool vidlocked;
> +	bool ts_is_interlaced;
> +	bool framer_enable;
> +};
> +
> +/* List of clocks required by UHD-SDI Rx subsystem */
> +static const char * const xsdirxss_clks[] = {
> +	"s_axi_aclk", "sdi_rx_clk", "video_out_clk",
> +};
> +
> +/* TODO - Add YUV 444/420 and RBG 10/12 bpc mbus formats here */
> +static const u32 xsdirxss_10bpc_mbus_fmts[] = {
> +	MEDIA_BUS_FMT_UYVY10_1X20,
> +};
> +
> +static const u32 xsdirxss_12bpc_mbus_fmts[] = {
> +	MEDIA_BUS_FMT_UYVY12_1X24,
> +};
> +
> +static const struct v4l2_dv_timings fmt_cap[] = {
> +	V4L2_DV_BT_SDI_720X487I60,
> +	V4L2_DV_BT_CEA_720X576I50,
> +	V4L2_DV_BT_CEA_1280X720P24,
> +	V4L2_DV_BT_CEA_1280X720P25,
> +	V4L2_DV_BT_CEA_1280X720P30,
> +	V4L2_DV_BT_CEA_1280X720P50,
> +	V4L2_DV_BT_CEA_1280X720P60,
> +	V4L2_DV_BT_CEA_1920X1080P24,
> +	V4L2_DV_BT_CEA_1920X1080P30,
> +	V4L2_DV_BT_CEA_1920X1080I50,
> +	V4L2_DV_BT_CEA_1920X1080I60,
> +	V4L2_DV_BT_CEA_1920X1080P50,
> +	V4L2_DV_BT_CEA_1920X1080P60,
> +	V4L2_DV_BT_CEA_3840X2160P24,
> +	V4L2_DV_BT_CEA_3840X2160P30,
> +	V4L2_DV_BT_CEA_3840X2160P50,
> +	V4L2_DV_BT_CEA_3840X2160P60,
> +	V4L2_DV_BT_CEA_4096X2160P24,
> +	V4L2_DV_BT_CEA_4096X2160P25,
> +	V4L2_DV_BT_CEA_4096X2160P30,
> +	V4L2_DV_BT_CEA_4096X2160P50,
> +	V4L2_DV_BT_CEA_4096X2160P60,
> +
> +	XLNX_V4L2_DV_BT_2048X1080P24,
> +	XLNX_V4L2_DV_BT_2048X1080P25,
> +	XLNX_V4L2_DV_BT_2048X1080P30,
> +	XLNX_V4L2_DV_BT_2048X1080I48,
> +	XLNX_V4L2_DV_BT_2048X1080I50,
> +	XLNX_V4L2_DV_BT_2048X1080I60,
> +	XLNX_V4L2_DV_BT_2048X1080P48,
> +	XLNX_V4L2_DV_BT_2048X1080P50,
> +	XLNX_V4L2_DV_BT_2048X1080P60,
> +	XLNX_V4L2_DV_BT_1920X1080P48,
> +	XLNX_V4L2_DV_BT_1920X1080I48,
> +	XLNX_V4L2_DV_BT_3840X2160P48,
> +	XLNX_V4L2_DV_BT_4096X2160P48,
> +};
> +
> +struct xsdirxss_dv_map {
> +	u32 width;
> +	u32 height;
> +	u32 fps;
> +	struct v4l2_dv_timings format;
> +};
> +
> +static const struct xsdirxss_dv_map xsdirxss_dv_timings[] = {
> +	/* SD - 720x487i60 */
> +	{ 720, 243, 30, V4L2_DV_BT_SDI_720X487I60 },
> +	/* SD - 720x576i50 */
> +	{ 720, 288, 25, V4L2_DV_BT_CEA_720X576I50 },
> +	/* HD - 1280x720p23.98 */
> +	/* HD - 1280x720p24 */
> +	{ 1280, 720, 24, V4L2_DV_BT_CEA_1280X720P24 },
> +	/* HD - 1280x720p25 */
> +	{ 1280, 720, 25, V4L2_DV_BT_CEA_1280X720P25 },
> +	/* HD - 1280x720p29.97 */
> +	/* HD - 1280x720p30 */
> +	{ 1280, 720, 30, V4L2_DV_BT_CEA_1280X720P30 },
> +	/* HD - 1280x720p50 */
> +	{ 1280, 720, 50, V4L2_DV_BT_CEA_1280X720P50 },
> +	/* HD - 1280x720p59.94 */
> +	/* HD - 1280x720p60 */
> +	{ 1280, 720, 60, V4L2_DV_BT_CEA_1280X720P60 },
> +	/* HD - 1920x1080p23.98 */
> +	/* HD - 1920x1080p24 */
> +	{ 1920, 1080, 24, V4L2_DV_BT_CEA_1920X1080P24 },
> +	/* HD - 1920x1080p25 */
> +	{ 1920, 1080, 25, V4L2_DV_BT_CEA_1920X1080P25 },
> +	/* HD - 1920x1080p29.97 */
> +	/* HD - 1920x1080p30 */
> +	{ 1920, 1080, 30, V4L2_DV_BT_CEA_1920X1080P30 },
> +
> +	/* HD - 2048x1080p23.98 */
> +	/* HD - 2048x1080p24 */
> +	{ 2048, 1080, 24, XLNX_V4L2_DV_BT_2048X1080P24 },
> +	/* HD - 2048x1080p25 */
> +	{ 2048, 1080, 24, XLNX_V4L2_DV_BT_2048X1080P25 },
> +	/* HD - 2048x1080p29.97 */
> +	/* HD - 2048x1080p30 */
> +	{ 2048, 1080, 24, XLNX_V4L2_DV_BT_2048X1080P30 },
> +	/* HD - 1920x1080i47.95 */
> +	/* HD - 1920x1080i48 */
> +	{ 1920, 540, 24, XLNX_V4L2_DV_BT_1920X1080I48 },
> +
> +	/* HD - 1920x1080i50 */
> +	{ 1920, 540, 25, V4L2_DV_BT_CEA_1920X1080I50 },
> +	/* HD - 1920x1080i59.94 */
> +	/* HD - 1920x1080i60 */
> +	{ 1920, 540, 30, V4L2_DV_BT_CEA_1920X1080I60 },
> +
> +	/* HD - 2048x1080i47.95 */
> +	/* HD - 2048x1080i48 */
> +	{ 2048, 540, 24, XLNX_V4L2_DV_BT_2048X1080I48 },
> +	/* HD - 2048x1080i50 */
> +	{ 2048, 540, 25, XLNX_V4L2_DV_BT_2048X1080I50 },
> +	/* HD - 2048x1080i59.94 */
> +	/* HD - 2048x1080i60 */
> +	{ 2048, 540, 30, XLNX_V4L2_DV_BT_2048X1080I60 },
> +	/* 3G - 1920x1080p47.95 */
> +	/* 3G - 1920x1080p48 */
> +	{ 1920, 1080, 48, XLNX_V4L2_DV_BT_1920X1080P48 },
> +
> +	/* 3G - 1920x1080p50 148.5 */
> +	{ 1920, 1080, 50, V4L2_DV_BT_CEA_1920X1080P50 },
> +	/* 3G - 1920x1080p59.94 148.5/1.001 */
> +	/* 3G - 1920x1080p60 148.5 */
> +	{ 1920, 1080, 60, V4L2_DV_BT_CEA_1920X1080P60 },
> +
> +	/* 3G - 2048x1080p47.95 */
> +	/* 3G - 2048x1080p48 */
> +	{ 2048, 1080, 48, XLNX_V4L2_DV_BT_2048X1080P48 },
> +	/* 3G - 2048x1080p50 */
> +	{ 2048, 1080, 50, XLNX_V4L2_DV_BT_2048X1080P50 },
> +	/* 3G - 2048x1080p59.94 */
> +	/* 3G - 2048x1080p60 */
> +	{ 2048, 1080, 60, XLNX_V4L2_DV_BT_2048X1080P60 },
> +
> +	/* 6G - 3840X2160p23.98 */
> +	/* 6G - 3840X2160p24 */
> +	{ 3840, 2160, 24, V4L2_DV_BT_CEA_3840X2160P24 },
> +	/* 6G - 3840X2160p25 */
> +	{ 3840, 2160, 25, V4L2_DV_BT_CEA_3840X2160P25 },
> +	/* 6G - 3840X2160p29.97 */
> +	/* 6G - 3840X2160p30 */
> +	{ 3840, 2160, 30, V4L2_DV_BT_CEA_3840X2160P30 },
> +	/* 6G - 4096X2160p23.98 */
> +	/* 6G - 4096X2160p24 */
> +	{ 4096, 2160, 24, V4L2_DV_BT_CEA_4096X2160P24 },
> +	/* 6G - 4096X2160p25 */
> +	{ 4096, 2160, 25, V4L2_DV_BT_CEA_4096X2160P25 },
> +	/* 6G - 4096X2160p29.97 */
> +	/* 6G - 4096X2160p30 */
> +	{ 4096, 2160, 30, V4L2_DV_BT_CEA_4096X2160P30 },
> +	/* 12G - 3840X2160p47.95 */
> +	/* 12G - 3840X2160p48 */
> +	{ 3840, 2160, 48, XLNX_V4L2_DV_BT_3840X2160P48 },
> +
> +	/* 12G - 3840X2160p50 */
> +	{ 3840, 2160, 50, V4L2_DV_BT_CEA_3840X2160P50 },
> +	/* 12G - 3840X2160p59.94 */
> +	/* 12G - 3840X2160p60 */
> +	{ 3840, 2160, 60, V4L2_DV_BT_CEA_3840X2160P60 },
> +
> +	/* 12G - 4096X2160p47.95 */
> +	/* 12G - 4096X2160p48 */
> +	{ 3840, 2160, 48, XLNX_V4L2_DV_BT_4096X2160P48 },
> +
> +	/* 12G - 4096X2160p50 */
> +	{ 4096, 2160, 50, V4L2_DV_BT_CEA_4096X2160P50 },
> +	/* 12G - 4096X2160p59.94 */
> +	/* 12G - 4096X2160p60 */
> +	{ 4096, 2160, 60, V4L2_DV_BT_CEA_4096X2160P60 },
> +};
> +
> +static inline struct xsdirxss_state *
> +to_xsdirxssstate(struct v4l2_subdev *subdev)
> +{
> +	return container_of(subdev, struct xsdirxss_state, subdev);
> +}
> +
> +/*
> + * Register related operations
> + */
> +static inline u32 xsdirxss_read(struct xsdirxss_core *xsdirxss, u32 addr)
> +{
> +	return ioread32(xsdirxss->iomem + addr);
> +}
> +
> +static inline void xsdirxss_write(struct xsdirxss_core *xsdirxss, u32 addr,
> +				  u32 value)
> +{
> +	iowrite32(value, xsdirxss->iomem + addr);
> +}
> +
> +static inline void xsdirxss_clr(struct xsdirxss_core *xsdirxss, u32 addr,
> +				u32 clr)
> +{
> +	xsdirxss_write(xsdirxss, addr, xsdirxss_read(xsdirxss, addr) & ~clr);
> +}
> +
> +static inline void xsdirxss_set(struct xsdirxss_core *xsdirxss, u32 addr,
> +				u32 set)
> +{
> +	xsdirxss_write(xsdirxss, addr, xsdirxss_read(xsdirxss, addr) | set);
> +}
> +
> +static inline void xsdirx_core_disable(struct xsdirxss_core *core)
> +{
> +	xsdirxss_clr(core, XSDIRX_RST_CTRL_REG, XSDIRX_RST_CTRL_SS_EN_MASK);
> +}
> +
> +static inline void xsdirx_core_enable(struct xsdirxss_core *core)
> +{
> +	xsdirxss_set(core, XSDIRX_RST_CTRL_REG, XSDIRX_RST_CTRL_SS_EN_MASK);
> +}
> +
> +static int xsdirx_set_modedetect(struct xsdirxss_core *core, u16 mask)
> +{
> +	u32 val;
> +	struct device *dev = core->dev;
> +
> +	mask &= XSDIRX_DETECT_ALL_MODES;
> +	if (!mask) {
> +		dev_err(dev, "Invalid bit mask = 0x%08x\n", mask);
> +		return -EINVAL;
> +	}
> +
> +	dev_dbg(dev, "mask = 0x%x\n", mask);
> +
> +	val = xsdirxss_read(core, XSDIRX_MDL_CTRL_REG);
> +	val &= ~XSDIRX_MDL_CTRL_MODE_DET_EN_MASK;
> +	val &= ~XSDIRX_MDL_CTRL_MODE_AUTO_DET_MASK;
> +	val &= ~XSDIRX_MDL_CTRL_FORCED_MODE_MASK;
> +
> +	if (hweight16(mask) > 1) {
> +		/* Multi mode detection as more than 1 bit set in mask */
> +		dev_dbg(dev, "Detect multiple modes\n");
> +
> +		if (mask & BIT(XSDIRX_MODE_SD_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_SD_EN_MASK;
> +		if (mask & BIT(XSDIRX_MODE_HD_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_HD_EN_MASK;
> +		if (mask & BIT(XSDIRX_MODE_3G_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_3G_EN_MASK;
> +		if (mask & BIT(XSDIRX_MODE_6G_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_6G_EN_MASK;
> +		if (mask & BIT(XSDIRX_MODE_12GI_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_12GI_EN_MASK;
> +		if (mask & BIT(XSDIRX_MODE_12GF_OFFSET))
> +			val |= XSDIRX_MDL_CTRL_MODE_12GF_EN_MASK;
> +
> +		val |= XSDIRX_MDL_CTRL_MODE_DET_EN_MASK;
> +	} else {
> +		/* Fixed Mode */
> +		u32 forced_mode_mask;
> +
> +		dev_dbg(dev, "Detect fixed mode\n");
> +
> +		/* Find offset of first bit set */
> +		switch (__ffs(mask)) {

Isn't it single bit at this point, so __ffs() is not needed?

> +		case XSDIRX_MODE_SD_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_SD_MASK;
> +			break;
> +		case XSDIRX_MODE_HD_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_HD_MASK;
> +			break;
> +		case XSDIRX_MODE_3G_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_3G_MASK;
> +			break;
> +		case XSDIRX_MODE_6G_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_6G_MASK;
> +			break;
> +		case XSDIRX_MODE_12GI_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_12GI_MASK;
> +			break;
> +		case XSDIRX_MODE_12GF_OFFSET:
> +			forced_mode_mask = XSDIRX_MODE_12GF_MASK;
> +			break;
> +		default:
> +			forced_mode_mask = 0;

Shouldn't this be an error?

> +		}
> +		dev_dbg(dev, "Forced Mode Mask : 0x%x\n",
> +			forced_mode_mask);
> +		val |= forced_mode_mask << XSDIRX_MDL_CTRL_FORCED_MODE_OFFSET;
> +	}
> +
> +	dev_dbg(dev, "Modes to be detected : sdi ctrl reg = 0x%08x\n",
> +		val);
> +	xsdirxss_write(core, XSDIRX_MDL_CTRL_REG, val);
> +
> +	return 0;
> +}
> +
> +static void xsdirx_framer(struct xsdirxss_core *core, bool flag)
> +{
> +	if (flag)
> +		xsdirxss_set(core, XSDIRX_MDL_CTRL_REG,
> +			     XSDIRX_MDL_CTRL_FRM_EN_MASK);
> +	else
> +		xsdirxss_clr(core, XSDIRX_MDL_CTRL_REG,
> +			     XSDIRX_MDL_CTRL_FRM_EN_MASK);

I'd use {}, but probably up to you.

> +}
> +
> +static void xsdirx_setedherrcnttrigger(struct xsdirxss_core *core, u32 enable)

Can this and similar names have some '_'? Maybe the name gets too long. I know
how difficult naming can be. :-)

> +{
> +	u32 val = xsdirxss_read(core, XSDIRX_EDH_ERRCNT_EN_REG);
> +
> +	val = enable & XSDIRX_EDH_ALLERR_MASK;
> +

Nit. I'd remove this empty line, but up to you.

> +	xsdirxss_write(core, XSDIRX_EDH_ERRCNT_EN_REG, val);
> +}
> +
> +static inline void xsdirx_setvidlockwindow(struct xsdirxss_core *core, u32 val)
> +{
> +	/*
> +	 * The video lock window is the amount of time for which the
> +	 * the mode and transport stream should be locked to get the
> +	 * video lock interrupt.
> +	 */
> +	xsdirxss_write(core, XSDIRX_VID_LOCK_WINDOW_REG, val);
> +}
> +
> +static inline void xsdirx_disableintr(struct xsdirxss_core *core, u32 mask)
> +{
> +	xsdirxss_clr(core, XSDIRX_IER_REG, mask);
> +}
> +
> +static inline void xsdirx_enableintr(struct xsdirxss_core *core, u32 mask)
> +{
> +	xsdirxss_set(core, XSDIRX_IER_REG, mask);
> +}
> +
> +static void xsdirx_globalintr(struct xsdirxss_core *core, bool flag)
> +{
> +	if (flag)
> +		xsdirxss_set(core, XSDIRX_GLBL_IER_REG,
> +			     XSDIRX_GLBL_INTR_EN_MASK);
> +	else
> +		xsdirxss_clr(core, XSDIRX_GLBL_IER_REG,
> +			     XSDIRX_GLBL_INTR_EN_MASK);
> +}
> +
> +static inline void xsdirx_clearintr(struct xsdirxss_core *core, u32 mask)
> +{
> +	xsdirxss_set(core, XSDIRX_ISR_REG, mask);
> +}

Not sure if these single line wrappers are needed. Inlining would be simpler.

> +
> +static void xsdirx_vid_bridge_control(struct xsdirxss_core *core,
> +				      bool enable)
> +{
> +	u32 mask = XSDIRX_RST_CTRL_SDIRX_BRIDGE_ENB_MASK;
> +
> +	/*
> +	 * TODO - Enable YUV444/RBG format in the bridge based
> +	 * on BYTE3 color format.
> +	 * XSDIRX_RST_CTRL_BRIDGE_CH_FMT_YUV444
> +	 */
> +	if (enable)
> +		xsdirxss_set(core, XSDIRX_RST_CTRL_REG, mask);
> +	else
> +		xsdirxss_clr(core, XSDIRX_RST_CTRL_REG, mask);
> +}
> +
> +static void xsdirx_axis4_bridge_control(struct xsdirxss_core *core,
> +					bool enable)
> +{
> +	if (enable)
> +		xsdirxss_set(core, XSDIRX_RST_CTRL_REG,
> +			     XSDIRX_RST_CTRL_VIDIN_AXI4S_MOD_ENB_MASK);
> +	else
> +		xsdirxss_clr(core, XSDIRX_RST_CTRL_REG,
> +			     XSDIRX_RST_CTRL_VIDIN_AXI4S_MOD_ENB_MASK);
> +}
> +
> +static void xsdirx_streamflow_control(struct xsdirxss_core *core, bool enable)
> +{
> +	/* The sdi to native bridge is followed by native to axis4 bridge */
> +	if (enable) {
> +		xsdirx_axis4_bridge_control(core, enable);
> +		xsdirx_vid_bridge_control(core, enable);
> +	} else {
> +		xsdirx_vid_bridge_control(core, enable);
> +		xsdirx_axis4_bridge_control(core, enable);
> +	}
> +}

Even these wrappers. The if check for enable can be removed when these are
inlined, hence less operations.

> +
> +static void xsdirxss_get_framerate(struct v4l2_fract *frame_interval,
> +				   u32 framerate)
> +{
> +	switch (framerate) {
> +	case XSDIRX_TS_DET_STAT_RATE_23_98HZ:
> +		frame_interval->numerator = 1001;
> +		frame_interval->denominator = 24000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_24HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 24000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_25HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 25000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_29_97HZ:
> +		frame_interval->numerator = 1001;
> +		frame_interval->denominator = 30000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_30HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 30000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_47_95HZ:
> +		frame_interval->numerator = 1001;
> +		frame_interval->denominator = 48000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_48HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 48000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_50HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 50000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_59_94HZ:
> +		frame_interval->numerator = 1001;
> +		frame_interval->denominator = 60000;
> +		break;
> +	case XSDIRX_TS_DET_STAT_RATE_60HZ:
> +		frame_interval->numerator = 1000;
> +		frame_interval->denominator = 60000;
> +		break;
> +	default:
> +		frame_interval->numerator = 1;
> +		frame_interval->denominator = 1;
> +	}
> +}
> +
> +static void xsdirxss_set_gtclk(struct xsdirxss_state *state)
> +{
> +	struct clk *gtclk;
> +	unsigned long clkrate;
> +	int ret, is_frac;
> +	struct xsdirxss_core *core = &state->core;
> +	u32 mode;
> +	static int prev_is_frac = -1;

This would prevent multiple instances. Can it be part of xsdirxss_state?

But I wonder why this previous setting and also being fractional fps
really matter. Instead, this always has to set to the required rate.

> +
> +	mode = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +	mode &= XSDIRX_MODE_DET_STAT_RX_MODE_MASK;
> +
> +	/*
> +	 * TODO: For now, don't change the clock rate for any mode except 12G.
> +	 * In future, configure gt clock for all modes and enable clock only
> +	 * when needed (stream on/off).
> +	 */
> +	if (mode != XSDIRX_MODE_12GI_MASK && mode != XSDIRX_MODE_12GF_MASK)
> +		return;
> +
> +	is_frac = state->frame_interval.numerator == 1001 ? 1 : 0;

This is related to how frame intervals are defined in xsdirxss_get_framerate(),
correct? Maybe some comments on both sides would be helpful, saying numerator
== 1001 is treated as fractional fps?

> +
> +	if (prev_is_frac == is_frac)
> +		return;
> +
> +	xsdirx_core_disable(core);
> +	xsdirx_globalintr(core, false);
> +	xsdirx_disableintr(core, XSDIRX_INTR_ALL_MASK);
> +
> +	/* get sdi_rx_clk */
> +	gtclk = core->clks[1].clk;
> +	clkrate = clk_get_rate(gtclk);

This is not needed.

> +	is_frac = state->frame_interval.numerator == 1001 ? 1 : 0;

Not needed.

> +
> +	/* calcualte clkrate */
> +	if (!is_frac)
> +		clkrate = CLK_INT;
> +	else
> +		clkrate = (CLK_INT * 1000) / 1001;
> +
> +	ret = clk_set_rate(gtclk, clkrate);
> +	if (ret)
> +		dev_err(core->dev, "failed to set clk rate = %d\n", ret);

If this puts the controller in non-functional state, better to be an error,
and stop.

> +
> +	clkrate = clk_get_rate(gtclk);

Shouldn't this rate be checked as set_rate() doesn't guarantee the requested
rate?

> +
> +	dev_dbg(core->dev, "clkrate = %lu is_frac = %d\n",
> +		clkrate, is_frac);
> +
> +	xsdirx_framer(core, state->framer_enable);
> +	xsdirx_setedherrcnttrigger(core, state->edhmask);
> +	xsdirx_setvidlockwindow(core, state->vidlockwin);
> +	xsdirx_set_modedetect(core, state->searchmask);
> +	xsdirx_enableintr(core, XSDIRX_INTR_ALL_MASK);
> +	xsdirx_globalintr(core, true);
> +	xsdirx_core_enable(core);
> +
> +	prev_is_frac = is_frac;
> +}
> +
> +/**
> + * xsdirx_get_stream_properties - Get SDI Rx stream properties
> + * @state: pointer to driver state
> + *
> + * This function decodes the stream's ST352 payload (if available) to get
> + * stream properties like width, height, picture type (interlaced/progressive),
> + * etc.
> + *
> + * Return: 0 for success else errors
> + */
> +static int xsdirx_get_stream_properties(struct xsdirxss_state *state)
> +{
> +	struct xsdirxss_core *core = &state->core;
> +	struct device *dev = core->dev;
> +	u32 mode, payload = 0, val, family, valid, tscan;
> +	u8 byte1 = 0, active_luma = 0, pic_type = 0, framerate = 0;
> +	u8 sampling = XST352_BYTE3_COLOR_FORMAT_422;
> +	struct v4l2_mbus_framefmt *format = &state->format;
> +	u32 bpc = XST352_BYTE4_BIT_DEPTH_10;
> +
> +	mode = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +	mode &= XSDIRX_MODE_DET_STAT_RX_MODE_MASK;
> +
> +	valid = xsdirxss_read(core, XSDIRX_ST352_VALID_REG);
> +
> +	if (mode >= XSDIRX_MODE_3G_MASK && !valid) {
> +		dev_err(dev, "No valid ST352 payload present even for 3G mode and above\n");
> +		return -EINVAL;
> +	}
> +
> +	val = xsdirxss_read(core, XSDIRX_TS_DET_STAT_REG);
> +	if (valid & XSDIRX_ST352_VALID_DS1_MASK) {
> +		payload = xsdirxss_read(core, XSDIRX_ST352_DS1_REG);
> +		byte1 = rshift_and_mask(payload, XST352_PAYLOAD_BYTE1);
> +		active_luma = mask_and_rshift(payload,
> +					      XST352_BYTE3_ACT_LUMA_COUNT);
> +		pic_type = mask_and_rshift(payload, XST352_BYTE2_PIC_TYPE);
> +		framerate = rshift_and_mask(payload, XST352_BYTE2_FPS);
> +		tscan = mask_and_rshift(payload, XST352_BYTE2_TS_TYPE);
> +		sampling = mask_and_rshift(payload, XST352_BYTE3_COLOR_FORMAT);
> +		bpc = mask_and_rshift(payload, XST352_BYTE4_BIT_DEPTH);
> +	} else {
> +		dev_dbg(dev, "No ST352 payload available : Mode = %d\n", mode);
> +		framerate = mask_and_rshift(val, XSDIRX_TS_DET_STAT_RATE);
> +		tscan = mask_and_rshift(val, XSDIRX_TS_DET_STAT_SCAN);
> +	}
> +
> +	if ((bpc == XST352_BYTE4_BIT_DEPTH_10 && core->bpc != 10) ||
> +	    (bpc == XST352_BYTE4_BIT_DEPTH_12 && core->bpc != 12)) {
> +		dev_dbg(dev, "Bit depth not supported. bpc = %d core->bpc = %d\n",
> +			bpc, core->bpc);
> +		return -EINVAL;
> +	}
> +
> +	family = mask_and_rshift(val, XSDIRX_TS_DET_STAT_FAMILY);
> +	state->ts_is_interlaced = tscan ? false : true;
> +
> +	dev_dbg(dev, "ts_is_interlaced = %d, family = %d\n",
> +		state->ts_is_interlaced, family);
> +
> +	switch (mode) {
> +	case XSDIRX_MODE_HD_MASK:
> +		if (!valid) {
> +			/* No payload obtained */
> +			dev_dbg(dev, "frame rate : %d, tscan = %d\n",
> +				framerate, tscan);
> +			/*
> +			 * NOTE : A progressive segmented frame pSF will be
> +			 * reported incorrectly as Interlaced as we rely on IP's
> +			 * transport scan locked bit.
> +			 */
> +			dev_warn(dev, "pSF will be incorrectly reported as Interlaced\n");
> +
> +			switch (framerate) {
> +			case XSDIRX_TS_DET_STAT_RATE_23_98HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_24HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_25HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_29_97HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_30HZ:
> +				if (family == XSDIRX_SMPTE_ST_296) {

This seems like a little too much nested switch - case and if statements in
single function. Do you think this can be cleaned up using some table,
ex using XSDIRX_MODE_*, XSDIRX_TS_DET_STAT_RATE_*, adjusted XST352_BYTE1_*,,,
as indexes to it? Or with separate functions Or is it overkill? I let you
decide though.

> +					format->width = 1280;
> +					format->height = 720;
> +					format->field = V4L2_FIELD_NONE;
> +				} else if (family == XSDIRX_SMPTE_ST_2048_2) {
> +					format->width = 2048;
> +					format->height = 1080;
> +					if (tscan)
> +						format->field = V4L2_FIELD_NONE;
> +					else
> +						format->field =
> +							V4L2_FIELD_ALTERNATE;
> +				} else {
> +					format->width = 1920;
> +					format->height = 1080;
> +					if (tscan)
> +						format->field = V4L2_FIELD_NONE;
> +					else
> +						format->field =
> +							V4L2_FIELD_ALTERNATE;
> +				}
> +				break;
> +			case XSDIRX_TS_DET_STAT_RATE_50HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_59_94HZ:
> +			case XSDIRX_TS_DET_STAT_RATE_60HZ:
> +				if (family == XSDIRX_SMPTE_ST_274) {
> +					format->width = 1920;
> +					format->height = 1080;
> +				} else {
> +					format->width = 1280;
> +					format->height = 720;
> +				}
> +				format->field = V4L2_FIELD_NONE;
> +				break;
> +			default:
> +				format->width = 1920;
> +				format->height = 1080;
> +				format->field = V4L2_FIELD_NONE;
> +			}
> +		} else {
> +			dev_dbg(dev, "Got the payload\n");
> +			switch (byte1) {
> +			case XST352_BYTE1_ST292_1x720L_1_5G:
> +				/* SMPTE ST 292-1 for 720 line payloads */
> +				format->width = 1280;
> +				format->height = 720;
> +				break;
> +			case XST352_BYTE1_ST292_1x1080L_1_5G:
> +				/* SMPTE ST 292-1 for 1080 line payloads */
> +				format->height = 1080;
> +				if (active_luma)
> +					format->width = 2048;
> +				else
> +					format->width = 1920;
> +				break;
> +			default:
> +				dev_dbg(dev, "Unknown HD Mode SMPTE standard\n");
> +				return -EINVAL;
> +			}
> +		}
> +		break;
> +	case XSDIRX_MODE_SD_MASK:
> +		format->field = V4L2_FIELD_ALTERNATE;
> +
> +		switch (family) {
> +		case XSDIRX_NTSC:
> +			format->width = 720;
> +			format->height = 486;
> +			break;
> +		case XSDIRX_PAL:
> +			format->width = 720;
> +			format->height = 576;
> +			break;
> +		default:
> +			dev_dbg(dev, "Unknown SD Mode SMPTE standard\n");
> +			return -EINVAL;
> +		}
> +		break;
> +	case XSDIRX_MODE_3G_MASK:
> +		switch (byte1) {
> +		case XST352_BYTE1_ST425_2008_750L_3GB:
> +			/* Sec 4.1.6.1 SMPTE 425-2008 */
> +		case XST352_BYTE1_ST372_2x720L_3GB:
> +			/* Table 13 SMPTE 425-2008 */
> +			format->width = 1280;
> +			format->height = 720;
> +			break;
> +		case XST352_BYTE1_ST425_2008_1125L_3GA:
> +			/* ST352 Table SMPTE 425-1 */
> +		case XST352_BYTE1_ST372_DL_3GB:
> +			/* Table 13 SMPTE 425-2008 */
> +		case XST352_BYTE1_ST372_2x1080L_3GB:
> +			/* Table 13 SMPTE 425-2008 */
> +			format->height = 1080;
> +			if (active_luma)
> +				format->width = 2048;
> +			else
> +				format->width = 1920;
> +			break;
> +		default:
> +			dev_dbg(dev, "Unknown 3G Mode SMPTE standard\n");
> +			return -EINVAL;
> +		}
> +		break;
> +	case XSDIRX_MODE_6G_MASK:
> +		switch (byte1) {
> +		case XST352_BYTE1_ST2081_10_DL_2160L_6G:
> +			/* Dual link 6G */
> +		case XST352_BYTE1_ST2081_10_2160L_6G:
> +			/* Table 3 SMPTE ST 2081-10 */
> +			format->height = 2160;
> +			if (active_luma)
> +				format->width = 4096;
> +			else
> +				format->width = 3840;
> +			break;
> +		case XST352_BYTE1_ST2081_10_2_1080L_6G:
> +			format->height = 1080;
> +			if (active_luma)
> +				format->width = 2048;
> +			else
> +				format->width = 1920;
> +			break;
> +		default:
> +			dev_dbg(dev, "Unknown 6G Mode SMPTE standard\n");
> +			return -EINVAL;
> +		}
> +		break;
> +	case XSDIRX_MODE_12GI_MASK:
> +	case XSDIRX_MODE_12GF_MASK:
> +		switch (byte1) {
> +		case XST352_BYTE1_ST2082_10_2160L_12G:
> +			/* Section 4.3.1 SMPTE ST 2082-10 */
> +			format->height = 2160;
> +			if (active_luma)
> +				format->width = 4096;
> +			else
> +				format->width = 3840;
> +			break;
> +		default:
> +			dev_dbg(dev, "Unknown 12G Mode SMPTE standard\n");
> +			return -EINVAL;
> +		}
> +		break;
> +	default:
> +		dev_err(dev, "Invalid Mode\n");
> +		return -EINVAL;
> +	}
> +
> +	if (valid) {
> +		if (pic_type)
> +			format->field = V4L2_FIELD_NONE;
> +		else
> +			format->field = V4L2_FIELD_ALTERNATE;
> +
> +		if (format->height == 1080 && pic_type && !tscan)
> +			format->field = V4L2_FIELD_ALTERNATE;
> +
> +		/*
> +		 * In 3GB DL pSF mode the video is similar to interlaced.
> +		 * So though it is a progressive video, its transport is
> +		 * interlaced and is sent as two width x (height/2) buffers.
> +		 */
> +		if (byte1 == XST352_BYTE1_ST372_DL_3GB) {
> +			if (state->ts_is_interlaced)
> +				format->field = V4L2_FIELD_ALTERNATE;
> +			else
> +				format->field = V4L2_FIELD_NONE;
> +		}
> +	}
> +
> +	if (format->field == V4L2_FIELD_ALTERNATE)
> +		format->height = format->height / 2;
> +
> +	switch (sampling) {
> +	case XST352_BYTE3_COLOR_FORMAT_422:
> +		if (core->bpc == 10)
> +			format->code = MEDIA_BUS_FMT_UYVY10_1X20;
> +		else
> +			format->code = MEDIA_BUS_FMT_UYVY12_1X24;
> +		break;
> +	case XST352_BYTE3_COLOR_FORMAT_420:
> +	case XST352_BYTE3_COLOR_FORMAT_YUV444:
> +	case XST352_BYTE3_COLOR_FORMAT_GBR:
> +		format->code = 0;
> +		dev_dbg(dev, "No corresponding media bus formats\n");
> +		break;
> +	default:
> +		dev_err(dev, "Unsupported color format : %d\n", sampling);
> +		return -EINVAL;
> +	}
> +
> +	xsdirxss_get_framerate(&state->frame_interval, framerate);
> +
> +	dev_dbg(dev, "Stream width = %d height = %d Field = %d payload = 0x%08x ts = 0x%08x\n",
> +		format->width, format->height, format->field, payload, val);
> +	dev_dbg(dev, "frame rate numerator = %d denominator = %d\n",
> +		state->frame_interval.numerator,
> +		state->frame_interval.denominator);
> +	dev_dbg(dev, "Stream code = 0x%x\n", format->code);
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_irq_handler - Interrupt handler for SDI Rx
> + * @irq: IRQ number
> + * @dev_id: Pointer to device state
> + *
> + * The SDI Rx interrupts are cleared by writing 1 to corresponding bit.
> + *
> + * Return: IRQ_HANDLED after handling interrupts
> + */
> +static irqreturn_t xsdirxss_irq_handler(int irq, void *dev_id)
> +{
> +	struct xsdirxss_state *state = (struct xsdirxss_state *)dev_id;
> +	struct xsdirxss_core *core = &state->core;
> +	struct device *dev = core->dev;
> +	u32 status;
> +
> +	status = xsdirxss_read(core, XSDIRX_ISR_REG);
> +	xsdirxss_write(core, XSDIRX_ISR_REG, status);
> +	dev_dbg(dev, "interrupt status = 0x%08x\n", status);

maybe,
	if (!status)
		return IRQ_NONE;

> +
> +	if (status & XSDIRX_INTR_VIDLOCK_MASK ||
> +	    status & XSDIRX_INTR_VIDUNLOCK_MASK) {
> +		u32 val1, val2;
> +
> +		dev_dbg(dev, "video lock/unlock interrupt\n");
> +
> +		xsdirx_streamflow_control(core, false);
> +		state->streaming = false;
> +
> +		val1 = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val2 = xsdirxss_read(core, XSDIRX_TS_DET_STAT_REG);
> +
> +		if ((val1 & XSDIRX_MODE_DET_STAT_MODE_LOCK_MASK) &&
> +		    (val2 & XSDIRX_TS_DET_STAT_LOCKED_MASK)) {
> +			u32 mask = XSDIRX_RST_CTRL_RST_CRC_ERRCNT_MASK |
> +				   XSDIRX_RST_CTRL_RST_EDH_ERRCNT_MASK;
> +
> +			dev_dbg(dev, "video lock interrupt\n");
> +
> +			xsdirxss_set(core, XSDIRX_RST_CTRL_REG, mask);
> +			xsdirxss_clr(core, XSDIRX_RST_CTRL_REG, mask);
> +
> +			val1 = xsdirxss_read(core, XSDIRX_ST352_VALID_REG);
> +			val2 = xsdirxss_read(core, XSDIRX_ST352_DS1_REG);
> +
> +			dev_dbg(dev, "valid st352 mask = 0x%08x\n", val1);
> +			dev_dbg(dev, "st352 payload = 0x%08x\n", val2);
> +
> +			if (!xsdirx_get_stream_properties(state)) {
> +				state->vidlocked = true;
> +				xsdirxss_set_gtclk(state);
> +			} else {
> +				dev_err(dev, "Unable to get stream properties!\n");
> +				state->vidlocked = false;
> +			}
> +		} else {
> +			dev_dbg(dev, "video unlock interrupt\n");
> +			state->vidlocked = false;
> +		}
> +
> +		memset(&state->event, 0, sizeof(state->event));
> +		state->event.type = V4L2_EVENT_SOURCE_CHANGE;
> +		state->event.u.src_change.changes =
> +			V4L2_EVENT_SRC_CH_RESOLUTION;
> +		v4l2_subdev_notify_event(&state->subdev, &state->event);
> +	}
> +
> +	if (status & XSDIRX_INTR_UNDERFLOW_MASK) {
> +		dev_dbg(dev, "Video in to AXI4 Stream core underflow interrupt\n");
> +
> +		memset(&state->event, 0, sizeof(state->event));
> +		state->event.type = V4L2_EVENT_XILINX_SDIRX_UNDERFLOW;
> +		v4l2_subdev_notify_event(&state->subdev, &state->event);
> +	}
> +
> +	if (status & XSDIRX_INTR_OVERFLOW_MASK) {
> +		dev_dbg(dev, "Video in to AXI4 Stream core overflow interrupt\n");
> +
> +		memset(&state->event, 0, sizeof(state->event));
> +		state->event.type = V4L2_EVENT_XILINX_SDIRX_OVERFLOW;
> +		v4l2_subdev_notify_event(&state->subdev, &state->event);
> +	}
> +	return IRQ_HANDLED;
> +}
> +
> +/**
> + * xsdirxss_subscribe_event - Subscribe to video lock and unlock event
> + * @sd: V4L2 Sub device
> + * @fh: V4L2 File Handle
> + * @sub: Subcribe event structure
> + *
> + * Return: 0 on success, errors otherwise
> + */
> +static int xsdirxss_subscribe_event(struct v4l2_subdev *sd,
> +				    struct v4l2_fh *fh,
> +				    struct v4l2_event_subscription *sub)
> +{
> +	int ret;
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +
> +	switch (sub->type) {
> +	case V4L2_EVENT_XILINX_SDIRX_UNDERFLOW:
> +	case V4L2_EVENT_XILINX_SDIRX_OVERFLOW:
> +		ret = v4l2_event_subscribe(fh, sub, XSDIRX_MAX_EVENTS, NULL);
> +		break;
> +	case V4L2_EVENT_SOURCE_CHANGE:
> +		ret = v4l2_src_change_event_subscribe(fh, sub);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +	dev_dbg(core->dev, "Event subscribed : 0x%08x\n", sub->type);

Having this in the beginning may help catch invalid subcription type too?

> +	return ret;
> +}
> +
> +/**
> + * xsdirxss_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 xsdirxss_unsubscribe_event(struct v4l2_subdev *sd,
> +				      struct v4l2_fh *fh,
> +				      struct v4l2_event_subscription *sub)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +
> +	dev_dbg(core->dev, "Event unsubscribe : 0x%08x\n", sub->type);
> +	return v4l2_event_unsubscribe(fh, sub);
> +}
> +
> +/**
> + * xsdirxss_s_ctrl - This is used to set the Xilinx SDI Rx V4L2 controls
> + * @ctrl: V4L2 control to be set
> + *
> + * This function is used to set the V4L2 controls for the Xilinx SDI Rx
> + * Subsystem.
> + *
> + * Return: 0 on success, errors otherwise
> + */
> +static int xsdirxss_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	int ret = 0;
> +	struct xsdirxss_state *xsdirxss =
> +		container_of(ctrl->handler, struct xsdirxss_state,
> +			     ctrl_handler);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	struct device *dev = core->dev;
> +
> +	dev_dbg(dev, "set ctrl id = 0x%08x val = 0x%08x\n",
> +		ctrl->id, ctrl->val);
> +
> +	if (xsdirxss->streaming) {
> +		dev_err(dev, "Cannot set controls while streaming\n");
> +		return -EINVAL;
> +	}
> +
> +	xsdirx_core_disable(core);
> +	switch (ctrl->id) {
> +	case V4L2_CID_XILINX_SDIRX_FRAMER:
> +		xsdirx_framer(core, ctrl->val);
> +		xsdirxss->framer_enable = ctrl->val;
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_VIDLOCK_WINDOW:
> +		xsdirx_setvidlockwindow(core, ctrl->val);
> +		xsdirxss->vidlockwin = ctrl->val;
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_EDH_ERRCNT_ENABLE:
> +		xsdirx_setedherrcnttrigger(core, ctrl->val);
> +		xsdirxss->edhmask = ctrl->val;
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_SEARCH_MODES:
> +		if (ctrl->val) {
> +			if (core->mode == XSDIRXSS_SDI_STD_3G) {
> +				dev_dbg(dev, "Upto 3G supported\n");
> +				ctrl->val &= ~(BIT(XSDIRX_MODE_6G_OFFSET) |
> +					       BIT(XSDIRX_MODE_12GI_OFFSET) |
> +					       BIT(XSDIRX_MODE_12GF_OFFSET));
> +			}
> +
> +			if (core->mode == XSDIRXSS_SDI_STD_6G) {
> +				dev_dbg(dev, "Upto 6G supported\n");
> +				ctrl->val &= ~(BIT(XSDIRX_MODE_12GI_OFFSET) |
> +					       BIT(XSDIRX_MODE_12GF_OFFSET));
> +			}
> +
> +			ret = xsdirx_set_modedetect(core, ctrl->val);
> +			if (!ret)
> +				xsdirxss->searchmask = ctrl->val;
> +		} else {

This can be done in te begining.

	if (!ctrl->val) {
		dev_err();
		return -EINVAL;
	}

	if (core->mode ...)

> +			dev_err(dev, "Select at least one mode!\n");
> +			return -EINVAL;
> +		}
> +		break;
> +	default:
> +		xsdirxss_set(core, XSDIRX_RST_CTRL_REG,
> +			     XSDIRX_RST_CTRL_SS_EN_MASK);
> +		return -EINVAL;
> +	}
> +	xsdirx_core_enable(core);

I realized that the core is enabled all the time. Can it be enabled / disabled
per stream on / off? Or is it tricky?

> +	return ret;
> +}
> +
> +/**
> + * xsdirxss_g_volatile_ctrl - get the Xilinx SDI Rx controls
> + * @ctrl: Pointer to V4L2 control
> + *
> + * Return: 0 on success, errors otherwise
> + */
> +static int xsdirxss_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	u32 val;
> +	struct xsdirxss_state *xsdirxss =
> +		container_of(ctrl->handler,
> +			     struct xsdirxss_state, ctrl_handler);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	struct device *dev = core->dev;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_XILINX_SDIRX_MODE_DETECT:
> +		if (!xsdirxss->vidlocked) {
> +			dev_err(dev, "Can't get values when video not locked!\n");
> +			return -EINVAL;
> +		}
> +		val = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val &= XSDIRX_MODE_DET_STAT_RX_MODE_MASK;
> +
> +		switch (val) {
> +		case XSDIRX_MODE_SD_MASK:
> +			ctrl->val = XSDIRX_MODE_SD_OFFSET;
> +			break;
> +		case XSDIRX_MODE_HD_MASK:
> +			ctrl->val = XSDIRX_MODE_HD_OFFSET;
> +			break;
> +		case XSDIRX_MODE_3G_MASK:
> +			ctrl->val = XSDIRX_MODE_3G_OFFSET;
> +			break;
> +		case XSDIRX_MODE_6G_MASK:
> +			ctrl->val = XSDIRX_MODE_6G_OFFSET;
> +			break;
> +		case XSDIRX_MODE_12GI_MASK:
> +			ctrl->val = XSDIRX_MODE_12GI_OFFSET;
> +			break;
> +		case XSDIRX_MODE_12GF_MASK:
> +			ctrl->val = XSDIRX_MODE_12GF_OFFSET;
> +			break;
> +		}
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_CRC:
> +		ctrl->val = xsdirxss_read(core, XSDIRX_CRC_ERRCNT_REG);
> +		xsdirxss_write(core, XSDIRX_CRC_ERRCNT_REG, 0xFFFF);
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_EDH_ERRCNT:
> +		val = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val &= XSDIRX_MODE_DET_STAT_RX_MODE_MASK;
> +		if (val == XSDIRX_MODE_SD_MASK) {
> +			ctrl->val = xsdirxss_read(core, XSDIRX_EDH_ERRCNT_REG);
> +		} else {
> +			dev_dbg(dev, "%d - not in SD mode\n", ctrl->id);
> +			return -EINVAL;
> +		}
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_EDH_STATUS:
> +		val = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val &= XSDIRX_MODE_DET_STAT_RX_MODE_MASK;
> +		if (val == XSDIRX_MODE_SD_MASK) {
> +			ctrl->val = xsdirxss_read(core, XSDIRX_EDH_STAT_REG);
> +		} else {
> +			dev_dbg(dev, "%d - not in SD mode\n", ctrl->id);
> +			return -EINVAL;
> +		}
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_TS_IS_INTERLACED:
> +		if (!xsdirxss->vidlocked) {
> +			dev_err(dev, "Can't get values when video not locked!\n");
> +			return -EINVAL;
> +		}
> +		ctrl->val = xsdirxss->ts_is_interlaced;
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_ACTIVE_STREAMS:
> +		if (!xsdirxss->vidlocked) {
> +			dev_err(dev, "Can't get values when video not locked!\n");
> +			return -EINVAL;
> +		}
> +		val = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val &= XSDIRX_MODE_DET_STAT_ACT_STREAM_MASK;
> +		val >>= XSDIRX_MODE_DET_STAT_ACT_STREAM_OFFSET;
> +		ctrl->val = 1 << val;
> +		break;
> +	case V4L2_CID_XILINX_SDIRX_IS_3GB:
> +		if (!xsdirxss->vidlocked) {
> +			dev_err(dev, "Can't get values when video not locked!\n");
> +			return -EINVAL;
> +		}
> +		val = xsdirxss_read(core, XSDIRX_MODE_DET_STAT_REG);
> +		val &= XSDIRX_MODE_DET_STAT_LVLB_3G_MASK;
> +		ctrl->val = val ? true : false;
> +		break;
> +	default:
> +		dev_err(dev, "Get Invalid control id 0x%0x\n", ctrl->id);
> +		return -EINVAL;
> +	}
> +	dev_dbg(dev, "Get ctrl id = 0x%08x val = 0x%08x\n", ctrl->id,
> +		ctrl->val);
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_log_status - Logs the status of the SDI Rx Subsystem
> + * @sd: Pointer to V4L2 subdevice structure
> + *
> + * This function prints the current status of Xilinx SDI Rx Subsystem
> + *
> + * Return: 0 on success
> + */
> +static int xsdirxss_log_status(struct v4l2_subdev *sd)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	u32 i;
> +
> +	v4l2_info(sd, "***** SDI Rx subsystem reg dump start *****\n");
> +	for (i = 0; i < 0x28; i++) {
> +		u32 data;
> +
> +		data = xsdirxss_read(core, i * 4);
> +		v4l2_info(sd, "offset 0x%08x data 0x%08x\n",
> +			  i * 4, data);
> +	}
> +	v4l2_info(sd, "***** SDI Rx subsystem reg dump end *****\n");
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_g_frame_interval - Get the frame interval
> + * @sd: V4L2 Sub device
> + * @fi: Pointer to V4l2 Sub device frame interval structure
> + *
> + * This function is used to get the frame interval.
> + * The frame rate can be integral or fractional.
> + * Integral frame rate e.g. numerator = 1000, denominator = 24000 => 24 fps
> + * Fractional frame rate e.g. numerator = 1001, denominator = 24000 => 23.97 fps
> + *
> + * Return: 0 on success
> + */
> +static int xsdirxss_g_frame_interval(struct v4l2_subdev *sd,
> +				     struct v4l2_subdev_frame_interval *fi)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +
> +	if (!xsdirxss->vidlocked) {
> +		dev_err(core->dev, "Video not locked!\n");
> +		return -EINVAL;
> +	}
> +
> +	fi->interval = xsdirxss->frame_interval;
> +
> +	dev_dbg(core->dev, "frame rate numerator = %d denominator = %d\n",
> +		xsdirxss->frame_interval.numerator,
> +		xsdirxss->frame_interval.denominator);
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_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 SDI Rx Subsystem.
> + *
> + * Return: 0 on success, errors otherwise
> + */
> +static int xsdirxss_s_stream(struct v4l2_subdev *sd, int enable)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	struct device *dev = core->dev;
> +
> +	if (enable) {
> +		if (!xsdirxss->vidlocked) {
> +			dev_dbg(dev, "Video is not locked\n");

dev_err()?

> +			return -EINVAL;
> +		}
> +		if (xsdirxss->streaming) {
> +			dev_dbg(dev, "Already streaming\n");
> +			return -EINVAL;

Is this an error? I think it can just return 0 instead.

> +		}
> +
> +		xsdirx_streamflow_control(core, true);
> +		xsdirxss->streaming = true;
> +		dev_dbg(dev, "Streaming started\n");
> +	} else {
> +		if (!xsdirxss->streaming) {
> +			dev_dbg(dev, "Stopped streaming already\n");
> +			return 0;
> +		}
> +
> +		xsdirx_streamflow_control(core, false);
> +		xsdirxss->streaming = false;
> +		dev_dbg(dev, "Streaming stopped\n");
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_g_input_status - It is used to determine if the video signal
> + * is present / locked onto or not.
> + *
> + * @sd: V4L2 Sub device
> + * @status: status of signal locked
> + *
> + * This is used to determine if the video signal is present and locked onto
> + * by the SDI Rx core or not based on vidlocked flag.
> + *
> + * Return: zero on success
> + */
> +static int xsdirxss_g_input_status(struct v4l2_subdev *sd, u32 *status)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +
> +	if (!xsdirxss->vidlocked)
> +		*status = V4L2_IN_ST_NO_SYNC | V4L2_IN_ST_NO_SIGNAL;
> +	else
> +		*status = 0;
> +
> +	return 0;
> +}
> +
> +static struct v4l2_mbus_framefmt *
> +__xsdirxss_get_pad_format(struct xsdirxss_state *xsdirxss,
> +			  struct v4l2_subdev_pad_config *cfg,
> +			  unsigned int pad, u32 which)
> +{
> +	switch (which) {
> +	case V4L2_SUBDEV_FORMAT_TRY:
> +		return v4l2_subdev_get_try_format(&xsdirxss->subdev, cfg, pad);
> +	case V4L2_SUBDEV_FORMAT_ACTIVE:
> +		return &xsdirxss->format;
> +	default:
> +		return NULL;
> +	}
> +}
> +
> +/**
> + * xsdirxss_init_cfg - Initialise the pad format config to default
> + * @sd: Pointer to V4L2 Sub device structure
> + * @cfg: Pointer to sub device pad information structure
> + *
> + * This function is used to initialize the pad format with the default
> + * values.
> + *
> + * Return: 0 on success
> + */
> +static int xsdirxss_init_cfg(struct v4l2_subdev *sd,
> +			     struct v4l2_subdev_pad_config *cfg)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct v4l2_mbus_framefmt *format;
> +
> +	format = v4l2_subdev_get_try_format(sd, cfg, 0);
> +	*format = xsdirxss->default_format;
> +
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_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 xsdirxss_get_format(struct v4l2_subdev *sd,
> +			       struct v4l2_subdev_pad_config *cfg,
> +			       struct v4l2_subdev_format *fmt)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +
> +	if (!xsdirxss->vidlocked) {
> +		dev_err(core->dev, "Video not locked!\n");
> +		return -EINVAL;
> +	}
> +
> +	fmt->format = *__xsdirxss_get_pad_format(xsdirxss, cfg,
> +						 fmt->pad, fmt->which);
> +
> +	dev_dbg(core->dev, "Stream width = %d height = %d Field = %d\n",
> +		fmt->format.width, fmt->format.height, fmt->format.field);
> +
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_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.
> + *
> + * Return: 0 on success
> + */
> +static int xsdirxss_set_format(struct v4l2_subdev *sd,
> +			       struct v4l2_subdev_pad_config *cfg,
> +			       struct v4l2_subdev_format *fmt)
> +{
> +	struct v4l2_mbus_framefmt *__format;
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +
> +	dev_dbg(xsdirxss->core.dev,
> +		"set width %d height %d code %d field %d colorspace %d\n",
> +		fmt->format.width, fmt->format.height,
> +		fmt->format.code, fmt->format.field,
> +		fmt->format.colorspace);
> +
> +	__format = __xsdirxss_get_pad_format(xsdirxss, cfg,
> +					     fmt->pad, fmt->which);
> +
> +	/* Currently reset the code to one fixed in hardware */
> +	/* TODO : Add checks for width height */

Ah, what blocks to implement this? :-)

> +	fmt->format.code = __format->code;
> +
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_enum_mbus_code - Handle pixel format enumeration
> + * @sd: pointer to v4l2 subdev structure
> + * @cfg: V4L2 subdev pad configuration
> + * @code: pointer to v4l2_subdev_mbus_code_enum structure
> + *
> + * Return: -EINVAL or zero on success
> + */
> +static int xsdirxss_enum_mbus_code(struct v4l2_subdev *sd,
> +				   struct v4l2_subdev_pad_config *cfg,
> +				   struct v4l2_subdev_mbus_code_enum *code)
> +{
> +	struct xsdirxss_state *xsdirxss = to_xsdirxssstate(sd);
> +	u32 index = code->index;
> +	u32 maxindex;
> +
> +	if (xsdirxss->core.bpc == 10)
> +		maxindex = ARRAY_SIZE(xsdirxss_10bpc_mbus_fmts);
> +	else
> +		maxindex = ARRAY_SIZE(xsdirxss_12bpc_mbus_fmts);
> +
> +	if (code->pad || index >= maxindex)
> +		return -EINVAL;
> +
> +	if (xsdirxss->core.bpc == 10)
> +		code->code = xsdirxss_10bpc_mbus_fmts[index];
> +	else
> +		code->code = xsdirxss_12bpc_mbus_fmts[index];
> +
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_enum_dv_timings: Enumerate all the supported DV timings
> + * @sd: pointer to v4l2 subdev structure
> + * @timings: DV timings structure to be returned.
> + *
> + * Return: -EINVAL incase of invalid index and pad or zero on success
> + */
> +static int xsdirxss_enum_dv_timings(struct v4l2_subdev *sd,
> +				    struct v4l2_enum_dv_timings *timings)
> +{
> +	if (timings->index >= ARRAY_SIZE(fmt_cap))
> +		return -EINVAL;
> +
> +	if (timings->pad != 0)
> +		return -EINVAL;
> +
> +	timings->timings = fmt_cap[timings->index];
> +	return 0;
> +}
> +
> +/**
> + * xsdirxss_query_dv_timings: Query for the current DV timings
> + * @sd: pointer to v4l2 subdev structure
> + * @timings: DV timings structure to be returned.
> + *
> + * Return: -ENOLCK when video is not locked, -ERANGE when corresponding timing
> + * entry is not found or zero on success.
> + */
> +static int xsdirxss_query_dv_timings(struct v4l2_subdev *sd,
> +				     struct v4l2_dv_timings *timings)
> +{
> +	struct xsdirxss_state *state = to_xsdirxssstate(sd);
> +	unsigned int i;
> +
> +	if (!state->vidlocked)
> +		return -ENOLCK;
> +
> +	for (i = 0; i < ARRAY_SIZE(xsdirxss_dv_timings); i++) {
> +		if (state->format.width == xsdirxss_dv_timings[i].width &&
> +		    state->format.height == xsdirxss_dv_timings[i].height &&
> +		    state->frame_interval.denominator ==
> +		    (xsdirxss_dv_timings[i].fps * 1000)) {
> +			*timings = xsdirxss_dv_timings[i].format;
> +			return 0;
> +		}
> +	}
> +
> +	return -ERANGE;
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Media Operations
> + */
> +
> +static const struct media_entity_operations xsdirxss_media_ops = {
> +	.link_validate = v4l2_subdev_link_validate
> +};
> +
> +static const struct v4l2_ctrl_ops xsdirxss_ctrl_ops = {
> +	.g_volatile_ctrl = xsdirxss_g_volatile_ctrl,
> +	.s_ctrl	= xsdirxss_s_ctrl
> +};
> +
> +static const struct v4l2_ctrl_config xsdirxss_edh_ctrls[] = {
> +	{
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_EDH_ERRCNT_ENABLE,
> +		.name	= "SDI Rx : EDH Error Count Enable",
> +		.type	= V4L2_CTRL_TYPE_BITMASK,
> +		.min	= 0,
> +		.max	= XSDIRX_EDH_ALLERR_MASK,
> +		.def	= 0,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_EDH_ERRCNT,
> +		.name	= "SDI Rx : EDH Error Count",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= 0,
> +		.max	= 0xFFFF,
> +		.step	= 1,
> +		.def	= 0,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_EDH_STATUS,
> +		.name	= "SDI Rx : EDH Status",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= 0,
> +		.max	= 0xFFFFFFFF,
> +		.step	= 1,
> +		.def	= 0,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}
> +};
> +
> +static const struct v4l2_ctrl_config xsdirxss_ctrls[] = {
> +	{
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_FRAMER,
> +		.name	= "SDI Rx : Enable Framer",
> +		.type	= V4L2_CTRL_TYPE_BOOLEAN,
> +		.min	= false,
> +		.max	= true,
> +		.step	= 1,
> +		.def	= true,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_VIDLOCK_WINDOW,
> +		.name	= "SDI Rx : Video Lock Window",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= 0,
> +		.max	= 0xFFFFFFFF,
> +		.step	= 1,
> +		.def	= XSDIRX_DEFAULT_VIDEO_LOCK_WINDOW,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_SEARCH_MODES,
> +		.name	= "SDI Rx : Modes search Mask",
> +		.type	= V4L2_CTRL_TYPE_BITMASK,
> +		.min	= 0,
> +		.max	= XSDIRX_DETECT_ALL_MODES,
> +		.def	= XSDIRX_DETECT_ALL_MODES,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_MODE_DETECT,
> +		.name	= "SDI Rx : Mode Detect Status",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= XSDIRX_MODE_SD_OFFSET,
> +		.max	= XSDIRX_MODE_12GF_OFFSET,
> +		.step	= 1,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_CRC,
> +		.name	= "SDI Rx : CRC Error status",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= 0,
> +		.max	= 0xFFFFFFFF,
> +		.step	= 1,
> +		.def	= 0,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_TS_IS_INTERLACED,
> +		.name	= "SDI Rx : TS is Interlaced",
> +		.type	= V4L2_CTRL_TYPE_BOOLEAN,
> +		.min	= false,
> +		.max	= true,
> +		.def	= false,
> +		.step	= 1,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_ACTIVE_STREAMS,
> +		.name	= "SDI Rx : Active Streams",
> +		.type	= V4L2_CTRL_TYPE_INTEGER,
> +		.min	= 1,
> +		.max	= 16,
> +		.def	= 1,
> +		.step	= 1,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}, {
> +		.ops	= &xsdirxss_ctrl_ops,
> +		.id	= V4L2_CID_XILINX_SDIRX_IS_3GB,
> +		.name	= "SDI Rx : Is 3GB",
> +		.type	= V4L2_CTRL_TYPE_BOOLEAN,
> +		.min	= false,
> +		.max	= true,
> +		.def	= false,
> +		.step	= 1,
> +		.flags  = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
> +	}
> +};
> +
> +static const struct v4l2_subdev_core_ops xsdirxss_core_ops = {
> +	.log_status = xsdirxss_log_status,
> +	.subscribe_event = xsdirxss_subscribe_event,
> +	.unsubscribe_event = xsdirxss_unsubscribe_event
> +};
> +
> +static const struct v4l2_subdev_video_ops xsdirxss_video_ops = {
> +	.g_frame_interval = xsdirxss_g_frame_interval,
> +	.s_stream = xsdirxss_s_stream,
> +	.g_input_status = xsdirxss_g_input_status,
> +	.query_dv_timings = xsdirxss_query_dv_timings,
> +};
> +
> +static const struct v4l2_subdev_pad_ops xsdirxss_pad_ops = {
> +	.init_cfg = xsdirxss_init_cfg,
> +	.get_fmt = xsdirxss_get_format,
> +	.set_fmt = xsdirxss_set_format,
> +	.enum_mbus_code = xsdirxss_enum_mbus_code,
> +	.enum_dv_timings = xsdirxss_enum_dv_timings,
> +};
> +
> +static const struct v4l2_subdev_ops xsdirxss_ops = {
> +	.core = &xsdirxss_core_ops,
> +	.video = &xsdirxss_video_ops,
> +	.pad = &xsdirxss_pad_ops
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Platform Device Driver
> + */
> +
> +static int xsdirxss_parse_of(struct xsdirxss_state *xsdirxss)
> +{
> +	struct device_node *node = xsdirxss->core.dev->of_node;
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	struct device *dev = core->dev;
> +	struct fwnode_handle *ep, *rep;
> +	int ret;
> +	const char *sdi_std;
> +
> +	core->include_edh = of_property_read_bool(node, "xlnx,include-edh");
> +	dev_dbg(dev, "EDH property = %s\n",
> +		core->include_edh ? "Present" : "Absent");
> +
> +	ret = of_property_read_string(node, "xlnx,line-rate", &sdi_std);
> +	if (ret < 0) {
> +		dev_err(dev, "xlnx,line-rate property not found\n");
> +		return ret;
> +	}
> +
> +	if (!strncmp(sdi_std, "12G_SDI_8DS", XSDIRX_MAX_STR_LENGTH)) {
> +		core->mode = XSDIRXSS_SDI_STD_12G_8DS;
> +	} else if (!strncmp(sdi_std, "6G_SDI", XSDIRX_MAX_STR_LENGTH)) {
> +		core->mode = XSDIRXSS_SDI_STD_6G;
> +	} else if (!strncmp(sdi_std, "3G_SDI", XSDIRX_MAX_STR_LENGTH)) {
> +		core->mode = XSDIRXSS_SDI_STD_3G;
> +	} else {
> +		dev_err(dev, "Invalid Line Rate\n");
> +		return -EINVAL;
> +	}
> +	dev_dbg(dev, "SDI Rx Line Rate = %s, mode = %d\n", sdi_std,
> +		core->mode);
> +
> +	ret = of_property_read_u32(node, "xlnx,bpp", &core->bpc);

But, the bpp and bpc are quite different. Shouldn't it be bpc?

> +	if (ret < 0) {
> +		dev_err(dev, "failed to get xlnx,bpp\n");
> +		return ret;
> +	}
> +
> +	if (core->bpc != 10 && core->bpc != 12) {
> +		dev_err(dev, "bits per component=%u. Can be 10 or 12 only\n",
> +			core->bpc);
> +		return -EINVAL;
> +	}
> +
> +	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0,
> +					     FWNODE_GRAPH_ENDPOINT_NEXT);
> +	if (!ep) {
> +		dev_err(dev, "no source port found");
> +		ret = -EINVAL;
> +		goto dt_parse_done;
> +	}
> +
> +	rep = fwnode_graph_get_remote_endpoint(ep);
> +	if (!rep) {
> +		dev_err(dev, "no remote sink endpoint found");
> +		ret = -EINVAL;
> +	}
> +
> +	fwnode_handle_put(rep);
> +dt_parse_done:
> +	fwnode_handle_put(ep);
> +	return ret;
> +}
> +
> +static int xsdirxss_probe(struct platform_device *pdev)
> +{
> +	struct v4l2_subdev *subdev;
> +	struct xsdirxss_state *xsdirxss;
> +	struct xsdirxss_core *core;
> +	struct device *dev;
> +	int ret;
> +	unsigned int num_ctrls, num_edh_ctrls = 0, i;
> +
> +	xsdirxss = devm_kzalloc(&pdev->dev, sizeof(*xsdirxss), GFP_KERNEL);
> +	if (!xsdirxss)
> +		return -ENOMEM;
> +
> +	xsdirxss->core.dev = &pdev->dev;
> +	core = &xsdirxss->core;
> +	dev = core->dev;
> +
> +	/* Register interrupt handler */
> +	core->irq = platform_get_irq(pdev, 0);

As mentioned, this doesn't have to be stored.

> +	ret = devm_request_threaded_irq(dev, core->irq, NULL,
> +					xsdirxss_irq_handler, IRQF_ONESHOT,
> +					dev_name(dev), xsdirxss);
> +	if (ret) {
> +		dev_err(dev, "Err = %d Interrupt handler reg failed!\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	core->num_clks = ARRAY_SIZE(xsdirxss_clks);
> +	core->clks = devm_kcalloc(dev, core->num_clks,
> +				  sizeof(*core->clks), GFP_KERNEL);
> +	if (!core->clks)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < core->num_clks; i++)
> +		core->clks[i].id = xsdirxss_clks[i];
> +
> +	ret = devm_clk_bulk_get(dev, core->num_clks, core->clks);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_bulk_prepare_enable(core->num_clks, core->clks);
> +	if (ret)
> +		return ret;
> +
> +	ret = xsdirxss_parse_of(xsdirxss);
> +	if (ret < 0)
> +		goto clk_err;
> +
> +	core->iomem = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(core->iomem)) {
> +		ret = PTR_ERR(core->iomem);
> +		goto clk_err;
> +	}
> +
> +	/* Reset the core */
> +	xsdirx_streamflow_control(core, false);
> +	xsdirx_core_disable(core);
> +	xsdirx_clearintr(core, XSDIRX_INTR_ALL_MASK);
> +	xsdirx_disableintr(core, XSDIRX_INTR_ALL_MASK);
> +	xsdirx_enableintr(core, XSDIRX_INTR_ALL_MASK);
> +	xsdirx_globalintr(core, true);
> +	xsdirxss_write(core, XSDIRX_CRC_ERRCNT_REG, 0xFFFF);
> +
> +	/* Initialize V4L2 subdevice and media entity */
> +	xsdirxss->pad.flags = MEDIA_PAD_FL_SOURCE;
> +
> +	/* Initialize the default format */
> +	if (core->bpc == 10)
> +		xsdirxss->default_format.code = MEDIA_BUS_FMT_UYVY10_1X20;
> +	else
> +		xsdirxss->default_format.code = MEDIA_BUS_FMT_UYVY12_1X24;
> +	xsdirxss->default_format.field = V4L2_FIELD_NONE;
> +	xsdirxss->default_format.colorspace = V4L2_COLORSPACE_DEFAULT;
> +	xsdirxss->default_format.width = XSDIRX_DEFAULT_WIDTH;
> +	xsdirxss->default_format.height = XSDIRX_DEFAULT_HEIGHT;
> +
> +	xsdirxss->format = xsdirxss->default_format;
> +
> +	/* Initialize V4L2 subdevice and media entity */
> +	subdev = &xsdirxss->subdev;
> +	v4l2_subdev_init(subdev, &xsdirxss_ops);
> +
> +	subdev->dev = &pdev->dev;
> +	strscpy(subdev->name, dev_name(dev), sizeof(subdev->name));
> +
> +	subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE;

I guess it doesn't matter, but this can be assigned directly to be clearer, not
ORed.

> +
> +	subdev->entity.ops = &xsdirxss_media_ops;
> +
> +	v4l2_set_subdevdata(subdev, xsdirxss);
> +
> +	ret = media_entity_pads_init(&subdev->entity, 1, &xsdirxss->pad);
> +	if (ret < 0)
> +		goto error;
> +
> +	/* Initialise and register the controls */
> +	num_ctrls = ARRAY_SIZE(xsdirxss_ctrls);
> +
> +	if (core->include_edh)
> +		num_edh_ctrls = ARRAY_SIZE(xsdirxss_edh_ctrls);
> +
> +	v4l2_ctrl_handler_init(&xsdirxss->ctrl_handler,
> +			       (num_ctrls + num_edh_ctrls));
> +
> +	for (i = 0; i < num_ctrls; i++) {
> +		struct v4l2_ctrl *ctrl;
> +
> +		dev_dbg(dev, "%d %s ctrl = 0x%x\n", i, xsdirxss_ctrls[i].name,
> +			xsdirxss_ctrls[i].id);
> +
> +		ctrl = v4l2_ctrl_new_custom(&xsdirxss->ctrl_handler,
> +					    &xsdirxss_ctrls[i], NULL);
> +		if (!ctrl) {
> +			dev_dbg(dev, "Failed to add %s ctrl\n",
> +				xsdirxss_ctrls[i].name);
> +			goto error;
> +		}
> +	}
> +
> +	if (core->include_edh) {
> +		for (i = 0; i < num_edh_ctrls; i++) {
> +			struct v4l2_ctrl *ctrl;
> +
> +			dev_dbg(dev, "%d %s ctrl = 0x%x\n", i,
> +				xsdirxss_edh_ctrls[i].name,
> +				xsdirxss_edh_ctrls[i].id);
> +
> +			ctrl = v4l2_ctrl_new_custom(&xsdirxss->ctrl_handler,
> +						    &xsdirxss_edh_ctrls[i],
> +						    NULL);
> +			if (!ctrl) {
> +				dev_dbg(dev, "Failed to add %s ctrl\n",
> +					xsdirxss_edh_ctrls[i].name);
> +				goto error;
> +			}
> +		}
> +	}
> +
> +	if (xsdirxss->ctrl_handler.error) {
> +		dev_err(dev, "failed to add controls\n");
> +		ret = xsdirxss->ctrl_handler.error;
> +		goto error;
> +	}
> +
> +	subdev->ctrl_handler = &xsdirxss->ctrl_handler;
> +
> +	ret = v4l2_ctrl_handler_setup(&xsdirxss->ctrl_handler);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to set controls\n");
> +		goto error;
> +	}
> +
> +	platform_set_drvdata(pdev, xsdirxss);
> +
> +	ret = v4l2_async_register_subdev(subdev);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to register subdev\n");
> +		goto error;
> +	}
> +
> +	xsdirxss->streaming = false;

Is this needed?

> +
> +	xsdirx_core_enable(core);
> +
> +	dev_info(dev, "probe success\n");
> +
> +	return 0;
> +error:
> +	v4l2_ctrl_handler_free(&xsdirxss->ctrl_handler);
> +	media_entity_cleanup(&subdev->entity);
> +	xsdirx_globalintr(core, false);
> +	xsdirx_disableintr(core, XSDIRX_INTR_ALL_MASK);
> +clk_err:
> +	clk_bulk_disable_unprepare(core->num_clks, core->clks);
> +	return ret;
> +}
> +
> +static int xsdirxss_remove(struct platform_device *pdev)
> +{
> +	struct xsdirxss_state *xsdirxss = platform_get_drvdata(pdev);
> +	struct xsdirxss_core *core = &xsdirxss->core;
> +	struct v4l2_subdev *subdev = &xsdirxss->subdev;
> +
> +	v4l2_async_unregister_subdev(subdev);
> +	v4l2_ctrl_handler_free(&xsdirxss->ctrl_handler);
> +	media_entity_cleanup(&subdev->entity);
> +
> +	xsdirx_globalintr(core, false);
> +	xsdirx_disableintr(core, XSDIRX_INTR_ALL_MASK);
> +	xsdirx_core_disable(core);

I believe the core has to be disabled first.

> +	xsdirx_streamflow_control(core, false);

But to be safer side, maybe all these can be done first? Similar for enable,
so enabling all after v4l/media registrations?

Thanks,
-hyun

> +
> +	clk_bulk_disable_unprepare(core->num_clks, core->clks);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id xsdirxss_of_id_table[] = {
> +	{ .compatible = "xlnx,v-smpte-uhdsdi-rx-ss-2.0" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, xsdirxss_of_id_table);
> +
> +static struct platform_driver xsdirxss_driver = {
> +	.driver = {
> +		.name		= "xilinx-sdirxss",
> +		.of_match_table	= xsdirxss_of_id_table,
> +	},
> +	.probe			= xsdirxss_probe,
> +	.remove			= xsdirxss_remove,
> +};
> +
> +module_platform_driver(xsdirxss_driver);
> +
> +MODULE_AUTHOR("Vishal Sagar <vsagar@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("Xilinx SDI Rx Subsystem Driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/uapi/linux/xilinx-sdirxss.h b/include/uapi/linux/xilinx-sdirxss.h
> new file mode 100644
> index 000000000000..6f2a093968d9
> --- /dev/null
> +++ b/include/uapi/linux/xilinx-sdirxss.h
> @@ -0,0 +1,179 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Xilinx SDI Rx Subsystem mode, event, custom timings

Nit. ',' at the end.

> + * and flag definitions.
> + *
> + * Copyright (C) 2019 - 2020 Xilinx, Inc.
> + *
> + * Contacts: Vishal Sagar <vishal.sagar@xxxxxxxxxx>
> + */
> +
> +#ifndef __UAPI_XILINX_SDIRXSS_H__
> +#define __UAPI_XILINX_SDIRXSS_H__
> +
> +#include <linux/types.h>
> +#include <linux/v4l2-dv-timings.h>
> +#include <linux/videodev2.h>
> +
> +/*
> + * Events
> + *
> + * V4L2_EVENT_XILINX_SDIRX_UNDERFLOW: Video in to AXI4 Stream core underflowed
> + * V4L2_EVENT_XILINX_SDIRX_OVERFLOW: Video in to AXI4 Stream core overflowed
> + */
> +#define V4L2_EVENT_XILINX_SDIRX_CLASS      (V4L2_EVENT_PRIVATE_START | 0x200)
> +#define V4L2_EVENT_XILINX_SDIRX_UNDERFLOW  (V4L2_EVENT_XILINX_SDIRX_CLASS | 0x1)
> +#define V4L2_EVENT_XILINX_SDIRX_OVERFLOW   (V4L2_EVENT_XILINX_SDIRX_CLASS | 0x2)

Since this is many definitions for a single subdev, do you think some of these
can be minimized? For example, if the action for underflow/overflow isn't
different, resetting the device, then these can fold into one event.


Could you double-check some below too? Unless each is associated with different
handling, it'd be good to minimize the user interface, ex by merging or even
removing.

Thanks,
-hyun

> +
> +/*
> + * This enum is used to prepare the bitmask of modes to be detected
> + */
> +enum {
> +	XSDIRX_MODE_SD_OFFSET = 0,
> +	XSDIRX_MODE_HD_OFFSET,
> +	XSDIRX_MODE_3G_OFFSET,
> +	XSDIRX_MODE_6G_OFFSET,
> +	XSDIRX_MODE_12GI_OFFSET,
> +	XSDIRX_MODE_12GF_OFFSET,
> +	XSDIRX_MODE_NUM_SUPPORTED,
> +};
> +
> +#define XSDIRX_DETECT_ALL_MODES		(BIT(XSDIRX_MODE_SD_OFFSET) | \
> +					BIT(XSDIRX_MODE_HD_OFFSET) | \
> +					BIT(XSDIRX_MODE_3G_OFFSET) | \
> +					BIT(XSDIRX_MODE_6G_OFFSET) | \
> +					BIT(XSDIRX_MODE_12GI_OFFSET) | \
> +					BIT(XSDIRX_MODE_12GF_OFFSET))
> +
> +/*
> + * EDH Error Types
> + * ANC - Ancillary Data Packet Errors
> + * FF - Full Field Errors
> + * AP - Active Portion Errors
> + */
> +
> +#define XSDIRX_EDH_ERRCNT_ANC_EDH_ERR		BIT(0)
> +#define XSDIRX_EDH_ERRCNT_ANC_EDA_ERR		BIT(1)
> +#define XSDIRX_EDH_ERRCNT_ANC_IDH_ERR		BIT(2)
> +#define XSDIRX_EDH_ERRCNT_ANC_IDA_ERR		BIT(3)
> +#define XSDIRX_EDH_ERRCNT_ANC_UES_ERR		BIT(4)
> +#define XSDIRX_EDH_ERRCNT_FF_EDH_ERR		BIT(5)
> +#define XSDIRX_EDH_ERRCNT_FF_EDA_ERR		BIT(6)
> +#define XSDIRX_EDH_ERRCNT_FF_IDH_ERR		BIT(7)
> +#define XSDIRX_EDH_ERRCNT_FF_IDA_ERR		BIT(8)
> +#define XSDIRX_EDH_ERRCNT_FF_UES_ERR		BIT(9)
> +#define XSDIRX_EDH_ERRCNT_AP_EDH_ERR		BIT(10)
> +#define XSDIRX_EDH_ERRCNT_AP_EDA_ERR		BIT(11)
> +#define XSDIRX_EDH_ERRCNT_AP_IDH_ERR		BIT(12)
> +#define XSDIRX_EDH_ERRCNT_AP_IDA_ERR		BIT(13)
> +#define XSDIRX_EDH_ERRCNT_AP_UES_ERR		BIT(14)
> +#define XSDIRX_EDH_ERRCNT_PKT_CHKSUM_ERR	BIT(15)
> +
> +#define XSDIRX_EDH_ALLERR_MASK		0xFFFF
> +
> +/* Xilinx DV timings not in mainline yet */
> +#define XLNX_V4L2_DV_BT_2048X1080P24 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 510, 44, 148, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080P25 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 400, 44, 148, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080P30 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 66, 20, 66, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080I48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 1, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 329, 44, 329, 2, 5, 15, 3, 5, 15, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080I50 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 1, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 274, 44, 274, 2, 5, 15, 3, 5, 15, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080I60 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 1, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		74250000, 66, 20, 66, 2, 5, 15, 3, 5, 15, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_1920X1080P48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(1920, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		148500000, 638, 44, 148, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080P48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		148500000, 510, 44, 148, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080P50 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		148500000, 400, 44, 148, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_2048X1080P60 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(2048, 1080, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		148500000, 88, 44, 20, 4, 5, 36, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_3840X2160P48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(3840, 2160, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		594000000, 1276, 88, 296, 8, 10, 72, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_4096X2160P48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(4096, 2160, 0, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		594000000, 1020, 88, 296, 8, 10, 72, 0, 0, 0, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#define XLNX_V4L2_DV_BT_1920X1080I48 { \
> +	.type = V4L2_DV_BT_656_1120, \
> +	V4L2_INIT_BT_TIMINGS(1920, 1080, 1, \
> +		V4L2_DV_HSYNC_POS_POL | V4L2_DV_VSYNC_POS_POL, \
> +		148500000, 371, 88, 371, 2, 5, 15, 3, 5, 15, \
> +		V4L2_DV_BT_STD_SDI) \
> +}
> +
> +#endif /* __UAPI_XILINX_SDIRXSS_H__ */
> diff --git a/include/uapi/linux/xilinx-v4l2-controls.h b/include/uapi/linux/xilinx-v4l2-controls.h
> index b6441fe705c5..e9de65e82642 100644
> --- a/include/uapi/linux/xilinx-v4l2-controls.h
> +++ b/include/uapi/linux/xilinx-v4l2-controls.h
> @@ -71,4 +71,71 @@
>  /* Noise level */
>  #define V4L2_CID_XILINX_TPG_NOISE_GAIN		(V4L2_CID_XILINX_TPG + 17)
>  
> +/*
> + * Xilinx SDI Rx Subsystem
> + */
> +
> +/* The base for the sdi rx driver controls.
> + * We reserve 32 controls for this driver.
> + *
> + * The V4L2_CID_XILINX_SDIRX_EDH_* controls are present only if
> + * EDH is enabled.
> + * The controls which can be set should only be set before enabling
> + * streaming. The controls which can be got should be called while
> + * streaming to get correct values.
> + * The V4L2_CID_XILINX_SDIRX_MODE_DETECT can be called when query dv timing
> + * returns a valid timing.
> + */
> +
> +#define V4L2_CID_XILINX_SDIRX			(V4L2_CID_XILINX_BASE + 0x20)
> +
> +/* Framer Control to enable or disable the framer */
> +#define V4L2_CID_XILINX_SDIRX_FRAMER		(V4L2_CID_XILINX_SDIRX + 1)
> +/*
> + * Video Lock Window Control to set the video lock window value
> + * This is the amount of time the mode and transport stream need
> + * to be locked before a video lock interrupt occurs.
> + */
> +#define V4L2_CID_XILINX_SDIRX_VIDLOCK_WINDOW	(V4L2_CID_XILINX_SDIRX + 2)
> +/* EDH Error Mask Control to enable EDH error count */
> +#define V4L2_CID_XILINX_SDIRX_EDH_ERRCNT_ENABLE	(V4L2_CID_XILINX_SDIRX + 3)
> +/*
> + * Mode search Control to pass the bit mask of modes to detect.
> + *
> + * bit 0 set to detect SD mode,
> + * bit 1 set to detect HD mode,
> + * bit 2 set to detect 3G (3GA & 3GB) mode,
> + * bit 3 set to detect 6G mode,
> + * bit 4 set to detect 12G integer frame rate mode,
> + * bit 5 set to detect 12G fractional frame rate mode,
> + */
> +#define V4L2_CID_XILINX_SDIRX_SEARCH_MODES	(V4L2_CID_XILINX_SDIRX + 4)
> +/*
> + * Get Detected Mode control
> + *
> + * Control Value - Mode detected
> + *        0      -     SD
> + *        1      -     HD
> + *        2      -     3G (3GA & 3GB)
> + *        3      -     6G
> + *        4      -     12G integer frame rate
> + *        5      -     12G fractional frame rate
> + */
> +#define V4L2_CID_XILINX_SDIRX_MODE_DETECT	(V4L2_CID_XILINX_SDIRX + 5)
> +/* Get number of CRC errors status control */
> +#define V4L2_CID_XILINX_SDIRX_CRC		(V4L2_CID_XILINX_SDIRX + 6)
> +/* Get EDH error count control */
> +#define V4L2_CID_XILINX_SDIRX_EDH_ERRCNT	(V4L2_CID_XILINX_SDIRX + 7)
> +/* Get EDH status control */
> +#define V4L2_CID_XILINX_SDIRX_EDH_STATUS	(V4L2_CID_XILINX_SDIRX + 8)
> +/* Get Transport Interlaced status whether it is interlaced or not */
> +#define V4L2_CID_XILINX_SDIRX_TS_IS_INTERLACED	(V4L2_CID_XILINX_SDIRX + 9)
> +/* Get number of Active Streams */
> +#define V4L2_CID_XILINX_SDIRX_ACTIVE_STREAMS	(V4L2_CID_XILINX_SDIRX + 10)
> +/*
> + * Get if the detected mode is 3GB.
> + * Can be used to distinguished between 3GA and 3GB
> + */
> +#define V4L2_CID_XILINX_SDIRX_IS_3GB		(V4L2_CID_XILINX_SDIRX + 11)
> +
>  #endif /* __UAPI_XILINX_V4L2_CONTROLS_H__ */
> -- 
> 2.21.0
> 
> 
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