linux-kernel - Re: [PATCH v5 4/4] media: imx8mq-mipi-csi2: Implement .get_frame

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Message-ID: <aKXdLAdWxPfwhDx0@lizhi-Precision-Tower-5810>
Date: Wed, 20 Aug 2025 10:35:24 -0400
From: Frank Li <Frank.li@....com>
To: Guoniu Zhou <guoniu.zhou@....com>
Cc: Rui Miguel Silva <rmfrfs@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Martin Kepplinger <martink@...teo.de>,
	Purism Kernel Team <kernel@...i.sm>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-media@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] media: imx8mq-mipi-csi2: Implement
 .get_frame_desc subdev callback

On Wed, Aug 20, 2025 at 07:04:59PM +0800, Guoniu Zhou wrote:
> Implement .get_frame_desc subdev callback since downstream subdev
> need to get frame description.
>
> Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 32 +++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
>
> diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> index 529928b94a193e02177f8773a0e68375b59b0a08..a28ccdeef8521c0e00d13b1860eadef5f2118651 100644
> --- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> +++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
> @@ -648,6 +648,37 @@ static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
>  	return 0;
>  }
>
> +static int imx8mq_mipi_csi_get_frame_desc(struct v4l2_subdev *sd,
> +					  unsigned int pad,
> +					  struct v4l2_mbus_frame_desc *fd)
> +{
> +	struct v4l2_mbus_frame_desc_entry *entry = &fd->entry[0];
> +	const struct csi2_pix_format *csi2_fmt;
> +	const struct v4l2_mbus_framefmt *fmt;
> +	struct v4l2_subdev_state *state;
> +
> +	if (pad != MIPI_CSI2_PAD_SOURCE)
> +		return -EINVAL;
> +
> +	state = v4l2_subdev_lock_and_get_active_state(sd);
> +	fmt = v4l2_subdev_state_get_format(state, MIPI_CSI2_PAD_SOURCE);
> +	csi2_fmt = find_csi2_format(fmt->code);
> +	v4l2_subdev_unlock_state(state);
> +
> +	if (!csi2_fmt)
> +		return -EPIPE;
> +
> +	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
> +	fd->num_entries = 1;
> +
> +	entry->flags = 0;
> +	entry->pixelcode = csi2_fmt->code;
> +	entry->bus.csi2.vc = 0;
> +	entry->bus.csi2.dt = media_bus_fmt_to_csi2_dt(csi2_fmt->code);
> +
> +	return 0;
> +}
> +
>  static const struct v4l2_subdev_video_ops imx8mq_mipi_csi_video_ops = {
>  	.s_stream	= imx8mq_mipi_csi_s_stream,
>  };
> @@ -656,6 +687,7 @@ static const struct v4l2_subdev_pad_ops imx8mq_mipi_csi_pad_ops = {
>  	.enum_mbus_code		= imx8mq_mipi_csi_enum_mbus_code,
>  	.get_fmt		= v4l2_subdev_get_fmt,
>  	.set_fmt		= imx8mq_mipi_csi_set_fmt,
> +	.get_frame_desc		= imx8mq_mipi_csi_get_frame_desc,
>  };
>
>  static const struct v4l2_subdev_ops imx8mq_mipi_csi_subdev_ops = {
>
> --
> 2.34.1
>