Re: [PATCH v3 03/23] media: atmel: introduce microchip csi2dc driver

Jacopo Mondi
2022-01-11T15:42:09Z

Hi Eugen

On Mon, Dec 13, 2021 at 03:49:20PM +0200, Eugen Hristev wrote:
> Microchip CSI2DC (CSI2 Demultiplexer Controller) is a misc bridge device
> that converts a byte stream in IDI Synopsys format (coming from a CSI2HOST)
> to a pixel stream that can be captured by a sensor controller.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

Thanks for addressing my comments on previous versions
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>

Thanks
j

> ---
> Changes in v3:
> - on set format, disable setting the source sink.
> - removed useless request to pm_request_idle
> - fixed YUV DT
> - added last frame debug info
> - removed writing read only VPCOL and VPROW registers
> - minor cosmetic changes
>
> Changes in v2:
> - implement try formats
> - added parallel mode
> - moved to fwlink endpoints
> - many other minor corrections from Jacopo's review
>
> Changes in this revision:
> - addressed comments by Jacopo and Laurent as in this thread:
> https://www.spinics.net/lists/linux-media/msg181044.html
>
> Previous change log :
> Changes in v5:
> - only in bindings
>
> Changes in v4:
> - now using get_mbus_config ops to get data from the subdevice, like the
> virtual channel id, and the clock type.
> - now having possibility to select any of the RAW10 data modes
> - at completion time, select which formats are also available in the subdevice,
> and move to the dynamic list accordingly
> - changed the pipeline integration, do not advertise subdev ready at probe time.
> wait until completion is done, and then start a workqueue that will register
> this device as a subdevice for the next element in pipeline.
> - moved the s_power code into a different function called now csi2dc_power
> that is called with CONFIG_PM functions. This is also called at completion,
> to have the device ready in case CONFIG_PM is not selected on the platform.
> - merged try_fmt into set_fmt
> - driver cleanup, wrapped lines over 80 characters
>
> Changes in v2:
> - moved driver to platform/atmel
> - fixed minor things as per Sakari's review
> - still some things from v2 review are not yet addressed, to be followed up
>
>
>
> drivers/media/platform/Makefile | 1 +
> drivers/media/platform/atmel/Kconfig | 15 +
> drivers/media/platform/atmel/Makefile | 1 +
> .../media/platform/atmel/microchip-csi2dc.c | 806 ++++++++++++++++++
> 4 files changed, 823 insertions(+)
> create mode 100644 drivers/media/platform/atmel/microchip-csi2dc.c
>
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 832357240e89..b18e5f704145 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -69,6 +69,7 @@ obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin/
> obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel/
> obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel/
> obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel/
> +obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += atmel/
>
> obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32/
>
> diff --git a/drivers/media/platform/atmel/Kconfig b/drivers/media/platform/atmel/Kconfig
> index dda2f27da317..f83bee373d82 100644
> --- a/drivers/media/platform/atmel/Kconfig
> +++ b/drivers/media/platform/atmel/Kconfig
> @@ -40,3 +40,18 @@ config VIDEO_ATMEL_ISI
> help
> This module makes the ATMEL Image Sensor Interface available
> as a v4l2 device.
> +
> +config VIDEO_MICROCHIP_CSI2DC
> + tristate "Microchip CSI2 Demux Controller"
> + depends on VIDEO_V4L2 && COMMON_CLK && OF
> + depends on ARCH_AT91 || COMPILE_TEST
> + select MEDIA_CONTROLLER
> + select VIDEO_V4L2_SUBDEV_API
> + select V4L2_FWNODE
> + help
> + CSI2 Demux Controller driver. CSI2DC is a helper chip
> + that converts IDI interface byte stream to a parallel pixel stream.
> + It supports various RAW formats as input.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called microchip-csi2dc.
> diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
> index 46d264ab7948..39f0a7eba702 100644
> --- a/drivers/media/platform/atmel/Makefile
> +++ b/drivers/media/platform/atmel/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
> obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-base.o
> obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel-isc.o
> obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel-xisc.o
> +obj-$(CONFIG_VIDEO_MICROCHIP_CSI2DC) += microchip-csi2dc.o
> diff --git a/drivers/media/platform/atmel/microchip-csi2dc.c b/drivers/media/platform/atmel/microchip-csi2dc.c
> new file mode 100644
> index 000000000000..6bc549c28e05
> --- /dev/null
> +++ b/drivers/media/platform/atmel/microchip-csi2dc.c
> @@ -0,0 +1,806 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Microchip CSI2 Demux Controller (CSI2DC) driver
> + *
> + * Copyright (C) 2018 Microchip Technology, Inc.
> + *
> + * Author: Eugen Hristev <eugen.hristev@microchip.com>
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-subdev.h>
> +
> +/* Global configuration register */
> +#define CSI2DC_GCFG 0x0
> +
> +/* MIPI sensor pixel clock is free running */
> +#define CSI2DC_GCFG_MIPIFRN BIT(0)
> +/* GPIO parallel interface selection */
> +#define CSI2DC_GCFG_GPIOSEL BIT(1)
> +/* Output waveform inter-line minimum delay */
> +#define CSI2DC_GCFG_HLC(v) ((v) << 4)
> +#define CSI2DC_GCFG_HLC_MASK GENMASK(7, 4)
> +/* SAMA7G5 requires a HLC delay of 15 */
> +#define SAMA7G5_HLC (15)
> +
> +/* Global control register */
> +#define CSI2DC_GCTLR 0x04
> +#define CSI2DC_GCTLR_SWRST BIT(0)
> +
> +/* Global status register */
> +#define CSI2DC_GS 0x08
> +
> +/* SSP interrupt status register */
> +#define CSI2DC_SSPIS 0x28
> +/* Pipe update register */
> +#define CSI2DC_PU 0xc0
> +/* Video pipe attributes update */
> +#define CSI2DC_PU_VP BIT(0)
> +
> +/* Pipe update status register */
> +#define CSI2DC_PUS 0xc4
> +
> +/* Video pipeline Interrupt Status Register */
> +#define CSI2DC_VPISR 0xf4
> +
> +/* Video pipeline enable register */
> +#define CSI2DC_VPE 0xf8
> +#define CSI2DC_VPE_ENABLE BIT(0)
> +
> +/* Video pipeline configuration register */
> +#define CSI2DC_VPCFG 0xfc
> +/* Data type */
> +#define CSI2DC_VPCFG_DT(v) ((v) << 0)
> +#define CSI2DC_VPCFG_DT_MASK GENMASK(5, 0)
> +/* Virtual channel identifier */
> +#define CSI2DC_VPCFG_VC(v) ((v) << 6)
> +#define CSI2DC_VPCFG_VC_MASK GENMASK(7, 6)
> +/* Decompression enable */
> +#define CSI2DC_VPCFG_DE BIT(8)
> +/* Decoder mode */
> +#define CSI2DC_VPCFG_DM(v) ((v) << 9)
> +#define CSI2DC_VPCFG_DM_DECODER8TO12 0
> +/* Decoder predictor 2 selection */
> +#define CSI2DC_VPCFG_DP2 BIT(12)
> +/* Recommended memory storage */
> +#define CSI2DC_VPCFG_RMS BIT(13)
> +/* Post adjustment */
> +#define CSI2DC_VPCFG_PA BIT(14)
> +
> +/* Video pipeline column register */
> +#define CSI2DC_VPCOL 0x100
> +/* Column number */
> +#define CSI2DC_VPCOL_COL(v) ((v) << 0)
> +#define CSI2DC_VPCOL_COL_MASK GENMASK(15, 0)
> +
> +/* Video pipeline row register */
> +#define CSI2DC_VPROW 0x104
> +/* Row number */
> +#define CSI2DC_VPROW_ROW(v) ((v) << 0)
> +#define CSI2DC_VPROW_ROW_MASK GENMASK(15, 0)
> +
> +/* Version register */
> +#define CSI2DC_VERSION 0x1fc
> +
> +/* register read/write helpers */
> +#define csi2dc_readl(st, reg) readl_relaxed((st)->base + (reg))
> +#define csi2dc_writel(st, reg, val) writel_relaxed((val), \
> + (st)->base + (reg))
> +
> +/* supported RAW data types */
> +#define CSI2DC_DT_RAW6 0x28
> +#define CSI2DC_DT_RAW7 0x29
> +#define CSI2DC_DT_RAW8 0x2a
> +#define CSI2DC_DT_RAW10 0x2b
> +#define CSI2DC_DT_RAW12 0x2c
> +#define CSI2DC_DT_RAW14 0x2d
> +/* YUV data types */
> +#define CSI2DC_DT_YUV422_8B 0x1e
> +
> +/*
> + * struct csi2dc_format - CSI2DC format type struct
> + * @mbus_code: Media bus code for the format
> + * @dt: Data type constant for this format
> + */
> +struct csi2dc_format {
> + u32 mbus_code;
> + u32 dt;
> +};
> +
> +static const struct csi2dc_format csi2dc_formats[] = {
> + {
> + .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
> + .dt = CSI2DC_DT_RAW8,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
> + .dt = CSI2DC_DT_RAW8,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
> + .dt = CSI2DC_DT_RAW8,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
> + .dt = CSI2DC_DT_RAW8,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
> + .dt = CSI2DC_DT_RAW10,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
> + .dt = CSI2DC_DT_RAW10,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
> + .dt = CSI2DC_DT_RAW10,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
> + .dt = CSI2DC_DT_RAW10,
> + }, {
> + .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
> + .dt = CSI2DC_DT_YUV422_8B,
> + },
> +};
> +
> +enum mipi_csi_pads {
> + CSI2DC_PAD_SINK = 0,
> + CSI2DC_PAD_SOURCE = 1,
> + CSI2DC_PADS_NUM = 2,
> +};
> +
> +/*
> + * struct csi2dc_device - CSI2DC device driver data/config struct
> + * @base: Register map base address
> + * @csi2dc_sd: v4l2 subdevice for the csi2dc device
> + * This is the subdevice that the csi2dc device itself
> + * registers in v4l2 subsystem
> + * @dev: struct device for this csi2dc device
> + * @pclk: Peripheral clock reference
> + * Input clock that clocks the hardware block internal
> + * logic
> + * @scck: Sensor Controller clock reference
> + * Input clock that is used to generate the pixel clock
> + * @format: Current saved format used in g/s fmt
> + * @cur_fmt: Current state format
> + * @try_fmt: Try format that is being tried
> + * @pads: Media entity pads for the csi2dc subdevice
> + * @clk_gated: Whether the clock is gated or free running
> + * @video_pipe: Whether video pipeline is configured
> + * @parallel_mode: The underlying subdevice is connected on a parallel bus
> + * @vc: Current set virtual channel
> + * @notifier: Async notifier that is used to bound the underlying
> + * subdevice to the csi2dc subdevice
> + * @input_sd: Reference to the underlying subdevice bound to the
> + * csi2dc subdevice
> + * @remote_pad: Pad number of the underlying subdevice that is linked
> + * to the csi2dc subdevice sink pad.
> + */
> +struct csi2dc_device {
> + void __iomem *base;
> + struct v4l2_subdev csi2dc_sd;
> + struct device *dev;
> + struct clk *pclk;
> + struct clk *scck;
> +
> + struct v4l2_mbus_framefmt format;
> +
> + const struct csi2dc_format *cur_fmt;
> + const struct csi2dc_format *try_fmt;
> +
> + struct media_pad pads[CSI2DC_PADS_NUM];
> +
> + bool clk_gated;
> + bool video_pipe;
> + bool parallel_mode;
> + u32 vc;
> +
> + struct v4l2_async_notifier notifier;
> +
> + struct v4l2_subdev *input_sd;
> +
> + u32 remote_pad;
> +};
> +
> +static inline struct csi2dc_device *
> +csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
> +{
> + return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
> +}
> +
> +static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + if (code->index >= ARRAY_SIZE(csi2dc_formats))
> + return -EINVAL;
> +
> + code->code = csi2dc_formats[code->index].mbus_code;
> +
> + return 0;
> +}
> +
> +static int csi2dc_get_fmt(struct v4l2_subdev *csi2dc_sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_format *format)
> +{
> + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
> + struct v4l2_mbus_framefmt *v4l2_try_fmt;
> +
> + if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> + v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
> + format->pad);
> + format->format = *v4l2_try_fmt;
> +
> + return 0;
> + }
> +
> + format->format = csi2dc->format;
> +
> + return 0;
> +}
> +
> +static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd,
> + struct v4l2_subdev_state *sd_state,
> + struct v4l2_subdev_format *req_fmt)
> +{
> + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
> + const struct csi2dc_format *fmt, *try_fmt = NULL;
> + struct v4l2_mbus_framefmt *v4l2_try_fmt;
> + unsigned int i;
> +
> + /*
> + * Setting the source pad is disabled.
> + * The same format is being propagated from the sink to source.
> + */
> + if (req_fmt->pad == CSI2DC_PAD_SOURCE)
> + return -EINVAL;
> +
> + for (i = 0; i < ARRAY_SIZE(csi2dc_formats); i++) {
> + fmt = &csi2dc_formats[i];
> + if (req_fmt->format.code == fmt->mbus_code)
> + try_fmt = fmt;
> + fmt++;
> + }
> +
> + /* in case we could not find the desired format, default to something */
> + if (!try_fmt) {
> + try_fmt = &csi2dc_formats[0];
> +
> + dev_dbg(csi2dc->dev,
> + "CSI2DC unsupported format 0x%x, defaulting to 0x%x\n",
> + req_fmt->format.code, csi2dc_formats[0].mbus_code);
> + }
> +
> + req_fmt->format.code = try_fmt->mbus_code;
> + req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
> + req_fmt->format.field = V4L2_FIELD_NONE;
> +
> + if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> + v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd, sd_state,
> + req_fmt->pad);
> + *v4l2_try_fmt = req_fmt->format;
> + /* Trying on the sink pad makes the source pad change too */
> + v4l2_try_fmt = v4l2_subdev_get_try_format(csi2dc_sd,
> + sd_state,
> + CSI2DC_PAD_SOURCE);
> + *v4l2_try_fmt = req_fmt->format;
> +
> + /* if we are just trying, we are done */
> + return 0;
> + }
> +
> + /* save the format for later requests */
> + csi2dc->format = req_fmt->format;
> +
> + /* update config */
> + csi2dc->cur_fmt = try_fmt;
> +
> + dev_dbg(csi2dc->dev, "new format set: 0x%x @%dx%d\n",
> + csi2dc->format.code, csi2dc->format.width,
> + csi2dc->format.height);
> +
> + return 0;
> +}
> +
> +static int csi2dc_power(struct csi2dc_device *csi2dc, int on)
> +{
> + int ret = 0;
> +
> + if (on) {
> + ret = clk_prepare_enable(csi2dc->pclk);
> + if (ret) {
> + dev_err(csi2dc->dev, "failed to enable pclk:%d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_prepare_enable(csi2dc->scck);
> + if (ret) {
> + dev_err(csi2dc->dev, "failed to enable scck:%d\n", ret);
> + clk_disable_unprepare(csi2dc->pclk);
> + return ret;
> + }
> +
> + /* if powering up, deassert reset line */
> + csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST);
> + } else {
> + /* if powering down, assert reset line */
> + csi2dc_writel(csi2dc, CSI2DC_GCTLR, 0);
> +
> + clk_disable_unprepare(csi2dc->scck);
> + clk_disable_unprepare(csi2dc->pclk);
> + }
> +
> + return ret;
> +}
> +
> +static int csi2dc_get_mbus_config(struct csi2dc_device *csi2dc)
> +{
> + struct v4l2_mbus_config mbus_config = { 0 };
> + int ret;
> +
> + ret = v4l2_subdev_call(csi2dc->input_sd, pad, get_mbus_config,
> + csi2dc->remote_pad, &mbus_config);
> + if (ret == -ENOIOCTLCMD) {
> + dev_dbg(csi2dc->dev,
> + "no remote mbus configuration available\n");
> + goto csi2dc_get_mbus_config_defaults;
> + }
> +
> + if (ret) {
> + dev_err(csi2dc->dev,
> + "failed to get remote mbus configuration\n");
> + goto csi2dc_get_mbus_config_defaults;
> + }
> +
> + if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_0)
> + csi2dc->vc = 0;
> + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_1)
> + csi2dc->vc = 1;
> + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_2)
> + csi2dc->vc = 2;
> + else if (mbus_config.flags & V4L2_MBUS_CSI2_CHANNEL_3)
> + csi2dc->vc = 3;
> +
> + dev_dbg(csi2dc->dev, "subdev sending on channel %d\n", csi2dc->vc);
> +
> + csi2dc->clk_gated = mbus_config.flags &
> + V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
> +
> + dev_dbg(csi2dc->dev, "mbus_config: %s clock\n",
> + csi2dc->clk_gated ? "gated" : "free running");
> +
> + return 0;
> +
> +csi2dc_get_mbus_config_defaults:
> + csi2dc->vc = 0; /* Virtual ID 0 by default */
> +
> + return 0;
> +}
> +
> +static void csi2dc_vp_update(struct csi2dc_device *csi2dc)
> +{
> + u32 vp, gcfg;
> +
> + if (!csi2dc->video_pipe) {
> + dev_err(csi2dc->dev, "video pipeline unavailable\n");
> + return;
> + }
> +
> + if (csi2dc->parallel_mode) {
> + /* In parallel mode, GPIO parallel interface must be selected */
> + gcfg = csi2dc_readl(csi2dc, CSI2DC_GCFG);
> + gcfg |= CSI2DC_GCFG_GPIOSEL;
> + csi2dc_writel(csi2dc, CSI2DC_GCFG, gcfg);
> + return;
> + }
> +
> + /* serial video pipeline */
> +
> + csi2dc_writel(csi2dc, CSI2DC_GCFG,
> + (SAMA7G5_HLC & CSI2DC_GCFG_HLC_MASK) |
> + (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN));
> +
> + vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK;
> + vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK;
> + vp &= ~CSI2DC_VPCFG_DE;
> + vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12);
> + vp &= ~CSI2DC_VPCFG_DP2;
> + vp &= ~CSI2DC_VPCFG_RMS;
> + vp |= CSI2DC_VPCFG_PA;
> +
> + csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp);
> + csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE);
> + csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP);
> +}
> +
> +static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable)
> +{
> + struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
> + int ret;
> +
> + if (enable) {
> + ret = pm_runtime_resume_and_get(csi2dc->dev);
> + if (ret < 0)
> + return ret;
> +
> + csi2dc_get_mbus_config(csi2dc);
> +
> + csi2dc_vp_update(csi2dc);
> +
> + return v4l2_subdev_call(csi2dc->input_sd, video, s_stream,
> + true);
> + }
> +
> + dev_dbg(csi2dc->dev,
> + "Last frame received: VPCOLR = %u, VPROWR= %u, VPISR = %x\n",
> + csi2dc_readl(csi2dc, CSI2DC_VPCOL),
> + csi2dc_readl(csi2dc, CSI2DC_VPROW),
> + csi2dc_readl(csi2dc, CSI2DC_VPISR));
> +
> + /* stop streaming scenario */
> + ret = v4l2_subdev_call(csi2dc->input_sd, video, s_stream, false);
> +
> + pm_runtime_put_sync(csi2dc->dev);
> +
> + return ret;
> +}
> +
> +static int csi2dc_init_cfg(struct v4l2_subdev *csi2dc_sd,
> + struct v4l2_subdev_state *sd_state)
> +{
> + struct v4l2_mbus_framefmt *v4l2_try_fmt =
> + v4l2_subdev_get_try_format(csi2dc_sd, sd_state, 0);
> +
> + v4l2_try_fmt->height = 480;
> + v4l2_try_fmt->width = 640;
> + v4l2_try_fmt->code = csi2dc_formats[0].mbus_code;
> + v4l2_try_fmt->colorspace = V4L2_COLORSPACE_SRGB;
> + v4l2_try_fmt->field = V4L2_FIELD_NONE;
> + v4l2_try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> + v4l2_try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
> + v4l2_try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +
> + return 0;
> +}
> +
> +static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = {
> + .enum_mbus_code = csi2dc_enum_mbus_code,
> + .set_fmt = csi2dc_set_fmt,
> + .get_fmt = csi2dc_get_fmt,
> + .init_cfg = csi2dc_init_cfg,
> +};
> +
> +static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
> + .s_stream = csi2dc_s_stream,
> +};
> +
> +static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
> + .pad = &csi2dc_pad_ops,
> + .video = &csi2dc_video_ops,
> +};
> +
> +static int csi2dc_async_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct csi2dc_device *csi2dc = container_of(notifier,
> + struct csi2dc_device, notifier);
> + int pad;
> + int ret;
> +
> + csi2dc->input_sd = subdev;
> +
> + pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
> + MEDIA_PAD_FL_SOURCE);
> + if (pad < 0) {
> + dev_err(csi2dc->dev, "Failed to find pad for %s\n",
> + subdev->name);
> + return pad;
> + }
> +
> + csi2dc->remote_pad = pad;
> +
> + ret = media_create_pad_link(&csi2dc->input_sd->entity,
> + csi2dc->remote_pad,
> + &csi2dc->csi2dc_sd.entity, 0,
> + MEDIA_LNK_FL_ENABLED);
> + if (ret) {
> + dev_err(csi2dc->dev,
> + "Failed to create pad link: %s to %s\n",
> + csi2dc->input_sd->entity.name,
> + csi2dc->csi2dc_sd.entity.name);
> + return ret;
> + }
> +
> + dev_dbg(csi2dc->dev, "link with %s pad: %d\n",
> + csi2dc->input_sd->name, csi2dc->remote_pad);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
> + .bound = csi2dc_async_bound,
> +};
> +
> +static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc,
> + struct fwnode_handle *input_fwnode)
> +{
> + struct v4l2_async_subdev *asd;
> + int ret = 0;
> +
> + v4l2_async_nf_init(&csi2dc->notifier);
> +
> + asd = v4l2_async_nf_add_fwnode_remote(&csi2dc->notifier,
> + input_fwnode,
> + struct v4l2_async_subdev);
> +
> + fwnode_handle_put(input_fwnode);
> +
> + if (IS_ERR(asd)) {
> + ret = PTR_ERR(asd);
> + dev_err(csi2dc->dev,
> + "failed to add async notifier for node %pOF: %d\n",
> + to_of_node(input_fwnode), ret);
> + v4l2_async_nf_cleanup(&csi2dc->notifier);
> + return ret;
> + }
> +
> + csi2dc->notifier.ops = &csi2dc_async_ops;
> +
> + ret = v4l2_async_subdev_nf_register(&csi2dc->csi2dc_sd,
> + &csi2dc->notifier);
> + if (ret) {
> + dev_err(csi2dc->dev, "fail to register async notifier: %d\n",
> + ret);
> + v4l2_async_nf_cleanup(&csi2dc->notifier);
> + }
> +
> + return ret;
> +}
> +
> +static int csi2dc_of_parse(struct csi2dc_device *csi2dc,
> + struct device_node *of_node)
> +{
> + struct fwnode_handle *input_fwnode, *output_fwnode;
> + struct v4l2_fwnode_endpoint input_endpoint = { 0 },
> + output_endpoint = { 0 };
> + int ret;
> +
> + input_fwnode = fwnode_graph_get_next_endpoint(of_fwnode_handle(of_node),
> + NULL);
> + if (!input_fwnode) {
> + dev_err(csi2dc->dev,
> + "missing port node at %pOF, input node is mandatory.\n",
> + of_node);
> + return -EINVAL;
> + }
> +
> + ret = v4l2_fwnode_endpoint_parse(input_fwnode, &input_endpoint);
> + if (ret) {
> + dev_err(csi2dc->dev, "endpoint not defined at %pOF\n", of_node);
> + goto csi2dc_of_parse_err;
> + }
> +
> + if (input_endpoint.bus_type == V4L2_MBUS_PARALLEL ||
> + input_endpoint.bus_type == V4L2_MBUS_BT656) {
> + csi2dc->parallel_mode = true;
> + dev_dbg(csi2dc->dev,
> + "subdevice connected on parallel interface\n");
> + }
> +
> + if (input_endpoint.bus_type == V4L2_MBUS_CSI2_DPHY) {
> + csi2dc->clk_gated = input_endpoint.bus.mipi_csi2.flags &
> + V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
> + dev_dbg(csi2dc->dev,
> + "subdevice connected on serial interface\n");
> + dev_dbg(csi2dc->dev, "DT: %s clock\n",
> + csi2dc->clk_gated ? "gated" : "free running");
> + }
> +
> + output_fwnode = fwnode_graph_get_next_endpoint
> + (of_fwnode_handle(of_node), input_fwnode);
> +
> + if (output_fwnode)
> + ret = v4l2_fwnode_endpoint_parse(output_fwnode,
> + &output_endpoint);
> +
> + fwnode_handle_put(output_fwnode);
> +
> + if (!output_fwnode || ret) {
> + dev_info(csi2dc->dev,
> + "missing output node at %pOF, data pipe available only.\n",
> + of_node);
> + } else {
> + if (output_endpoint.bus_type != V4L2_MBUS_PARALLEL &&
> + output_endpoint.bus_type != V4L2_MBUS_BT656) {
> + dev_err(csi2dc->dev,
> + "output port must be parallel/bt656.\n");
> + ret = -EINVAL;
> + goto csi2dc_of_parse_err;
> + }
> +
> + csi2dc->video_pipe = true;
> +
> + dev_dbg(csi2dc->dev,
> + "block %pOF [%d.%d]->[%d.%d] video pipeline\n",
> + of_node, input_endpoint.base.port,
> + input_endpoint.base.id, output_endpoint.base.port,
> + output_endpoint.base.id);
> + }
> +
> + /* prepare async notifier for subdevice completion */
> + return csi2dc_prepare_notifier(csi2dc, input_fwnode);
> +
> +csi2dc_of_parse_err:
> + fwnode_handle_put(input_fwnode);
> + return ret;
> +}
> +
> +static void csi2dc_default_format(struct csi2dc_device *csi2dc)
> +{
> + csi2dc->cur_fmt = &csi2dc_formats[0];
> +
> + csi2dc->format.height = 480;
> + csi2dc->format.width = 640;
> + csi2dc->format.code = csi2dc_formats[0].mbus_code;
> + csi2dc->format.colorspace = V4L2_COLORSPACE_SRGB;
> + csi2dc->format.field = V4L2_FIELD_NONE;
> + csi2dc->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> + csi2dc->format.quantization = V4L2_QUANTIZATION_DEFAULT;
> + csi2dc->format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +}
> +
> +static int csi2dc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct csi2dc_device *csi2dc;
> + int ret = 0;
> + u32 ver;
> +
> + csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL);
> + if (!csi2dc)
> + return -ENOMEM;
> +
> + csi2dc->dev = dev;
> +
> + csi2dc->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(csi2dc->base)) {
> + dev_err(dev, "base address not set\n");
> + return PTR_ERR(csi2dc->base);
> + }
> +
> + csi2dc->pclk = devm_clk_get(dev, "pclk");
> + if (IS_ERR(csi2dc->pclk)) {
> + ret = PTR_ERR(csi2dc->pclk);
> + dev_err(dev, "failed to get pclk: %d\n", ret);
> + return ret;
> + }
> +
> + csi2dc->scck = devm_clk_get(dev, "scck");
> + if (IS_ERR(csi2dc->scck)) {
> + ret = PTR_ERR(csi2dc->scck);
> + dev_err(dev, "failed to get scck: %d\n", ret);
> + return ret;
> + }
> +
> + v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops);
> +
> + csi2dc->csi2dc_sd.owner = THIS_MODULE;
> + csi2dc->csi2dc_sd.dev = dev;
> + snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name),
> + "csi2dc");
> +
> + csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
> +
> + platform_set_drvdata(pdev, csi2dc);
> +
> + ret = csi2dc_of_parse(csi2dc, dev->of_node);
> + if (ret)
> + goto csi2dc_probe_cleanup_entity;
> +
> + csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> + if (csi2dc->video_pipe)
> + csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
> +
> + ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity,
> + csi2dc->video_pipe ? CSI2DC_PADS_NUM : 1,
> + csi2dc->pads);
> + if (ret < 0) {
> + dev_err(dev, "media entity init failed\n");
> + goto csi2dc_probe_cleanup_notifier;
> + }
> +
> + csi2dc_default_format(csi2dc);
> +
> + /* turn power on to validate capabilities */
> + ret = csi2dc_power(csi2dc, true);
> + if (ret < 0)
> + goto csi2dc_probe_cleanup_notifier;
> +
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);
> + ver = csi2dc_readl(csi2dc, CSI2DC_VERSION);
> +
> + /*
> + * we must register the subdev after PM runtime has been requested,
> + * otherwise we might bound immediately and request pm_runtime_resume
> + * before runtime_enable.
> + */
> + ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd);
> + if (ret) {
> + dev_err(csi2dc->dev, "failed to register the subdevice\n");
> + goto csi2dc_probe_cleanup_notifier;
> + }
> +
> + dev_info(dev, "Microchip CSI2DC version %x\n", ver);
> +
> + return 0;
> +
> +csi2dc_probe_cleanup_notifier:
> + v4l2_async_nf_cleanup(&csi2dc->notifier);
> +csi2dc_probe_cleanup_entity:
> + media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
> +
> + return ret;
> +}
> +
> +static int csi2dc_remove(struct platform_device *pdev)
> +{
> + struct csi2dc_device *csi2dc = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> +
> + v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd);
> + v4l2_async_nf_unregister(&csi2dc->notifier);
> + v4l2_async_nf_cleanup(&csi2dc->notifier);
> + media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused csi2dc_runtime_suspend(struct device *dev)
> +{
> + struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
> +
> + return csi2dc_power(csi2dc, false);
> +}
> +
> +static int __maybe_unused csi2dc_runtime_resume(struct device *dev)
> +{
> + struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
> +
> + return csi2dc_power(csi2dc, true);
> +}
> +
> +static const struct dev_pm_ops csi2dc_dev_pm_ops = {
> + SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
> +};
> +
> +static const struct of_device_id csi2dc_of_match[] = {
> + { .compatible = "microchip,sama7g5-csi2dc" },
> + { }
> +};
> +
> +MODULE_DEVICE_TABLE(of, csi2dc_of_match);
> +
> +static struct platform_driver csi2dc_driver = {
> + .probe = csi2dc_probe,
> + .remove = csi2dc_remove,
> + .driver = {
> + .name = "microchip-csi2dc",
> + .pm = &csi2dc_dev_pm_ops,
> + .of_match_table = of_match_ptr(csi2dc_of_match),
> + },
> +};
> +
> +module_platform_driver(csi2dc_driver);
> +
> +MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
> +MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.25.1
>