linux-kernel - Re: [PATCH] i.MX6: Support 16-bit BT.1120 video input

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Date:   Wed, 06 Oct 2021 11:36:47 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Krzysztof Hałasa <khalasa@...p.pl>,
        Steve Longerbeam <slongerbeam@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] i.MX6: Support 16-bit BT.1120 video input

Hi Krzysztof,

On Wed, 2021-10-06 at 08:13 +0200, Krzysztof Hałasa wrote:
> Confirmed to work with ADV7610 HDMI receiver.
> 
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>
> 
> diff --git a/drivers/gpu/ipu-v3/ipu-csi.c b/drivers/gpu/ipu-v3/ipu-csi.c
> index 658c173bebdf..2893b68f1f7a 100644
> --- a/drivers/gpu/ipu-v3/ipu-csi.c
> +++ b/drivers/gpu/ipu-v3/ipu-csi.c
> @@ -261,10 +261,24 @@ static int mbus_code_to_bus_cfg(struct ipu_csi_bus_config *cfg, u32 mbus_code,
>  		cfg->data_width = IPU_CSI_DATA_WIDTH_8;
>  		break;
>  	case MEDIA_BUS_FMT_UYVY8_1X16:
> +		if (mbus_type == V4L2_MBUS_BT656) {
> +			cfg->data_fmt = CSI_SENS_CONF_DATA_FMT_YUV422_UYVY;
> +			cfg->data_width = IPU_CSI_DATA_WIDTH_8;
> +		} else {
> +			cfg->data_fmt = CSI_SENS_CONF_DATA_FMT_BAYER;
> +			cfg->data_width = IPU_CSI_DATA_WIDTH_16;
> +		}
> +		cfg->mipi_dt = MIPI_DT_YUV422;
> +		break;
>  	case MEDIA_BUS_FMT_YUYV8_1X16:
> -		cfg->data_fmt = CSI_SENS_CONF_DATA_FMT_BAYER;
> +		if (mbus_type == V4L2_MBUS_BT656) {
> +			cfg->data_fmt = CSI_SENS_CONF_DATA_FMT_YUV422_YUYV;
> +			cfg->data_width = IPU_CSI_DATA_WIDTH_8;
> +		} else {
> +			cfg->data_fmt = CSI_SENS_CONF_DATA_FMT_BAYER;
> +			cfg->data_width = IPU_CSI_DATA_WIDTH_16;
> +		}
>  		cfg->mipi_dt = MIPI_DT_YUV422;
> -		cfg->data_width = IPU_CSI_DATA_WIDTH_16;
>  		break;
>  	case MEDIA_BUS_FMT_SBGGR8_1X8:
>  	case MEDIA_BUS_FMT_SGBRG8_1X8:
> @@ -352,7 +366,7 @@ static int fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
>  			    const struct v4l2_mbus_config *mbus_cfg,
>  			    const struct v4l2_mbus_framefmt *mbus_fmt)
>  {
> -	int ret;
> +	int ret, is_bt1120;
>  
>  	memset(csicfg, 0, sizeof(*csicfg));
>  
> @@ -373,11 +387,18 @@ static int fill_csi_bus_cfg(struct ipu_csi_bus_config *csicfg,
>  		break;
>  	case V4L2_MBUS_BT656:
>  		csicfg->ext_vsync = 0;
> +		/* UYVY10_1X20 etc. should be supported as well */
> +		is_bt1120 = mbus_fmt->code == MEDIA_BUS_FMT_UYVY8_1X16 ||
> +			mbus_fmt->code == MEDIA_BUS_FMT_YUYV8_1X16;
>  		if (V4L2_FIELD_HAS_BOTH(mbus_fmt->field) ||
>  		    mbus_fmt->field == V4L2_FIELD_ALTERNATE)
> -			csicfg->clk_mode = IPU_CSI_CLK_MODE_CCIR656_INTERLACED;
> +			csicfg->clk_mode = is_bt1120 ?
> +				IPU_CSI_CLK_MODE_CCIR1120_INTERLACED_SDR :
> +				IPU_CSI_CLK_MODE_CCIR656_INTERLACED;
>  		else
> -			csicfg->clk_mode = IPU_CSI_CLK_MODE_CCIR656_PROGRESSIVE;
> +			csicfg->clk_mode = is_bt1120 ?
> +				IPU_CSI_CLK_MODE_CCIR1120_PROGRESSIVE_SDR :
> +				IPU_CSI_CLK_MODE_CCIR656_PROGRESSIVE;
>  		break;
>  	case V4L2_MBUS_CSI2_DPHY:
>  		/*
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index 45f9d797b9da..ba93512f8c71 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -139,6 +139,8 @@ static inline bool is_parallel_16bit_bus(struct v4l2_fwnode_endpoint *ep)
>   * Check for conditions that require the IPU to handle the
>   * data internally as generic data, aka passthrough mode:
>   * - raw bayer media bus formats, or
> + * - BT.656 and BT.1120 (8/10-bit YUV422) data can always be processed
> + *   on-the-fly (converted to YUV420)

This comment seems misleading. The CSI converts to YUV 4:4:4 internally.

>   * - the CSI is receiving from a 16-bit parallel bus, or
>   * - the CSI is receiving from an 8-bit parallel bus and the incoming
>   *   media bus format is other than UYVY8_2X8/YUYV8_2X8.
> @@ -147,6 +149,9 @@ static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep,
>  					struct v4l2_mbus_framefmt *infmt,
>  					const struct imx_media_pixfmt *incc)
>  {
> +	if (ep->bus_type == V4L2_MBUS_BT656) // including BT.1120
> +		return 0;
> +
>  	return incc->bayer || is_parallel_16bit_bus(ep) ||
>  		(is_parallel_bus(ep) &&
>  		 infmt->code != MEDIA_BUS_FMT_UYVY8_2X8 &&

regards
Philipp