linux-kernel - [PATCH v4 4/4] media: imx8mq-mipi-csi2: Implement .get_frame

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Message-Id: <20250819-csi2_imx8mq-v4-4-c16b1d8f88a9@nxp.com>
Date: Tue, 19 Aug 2025 11:58:03 +0800
From: Guoniu Zhou <guoniu.zhou@....com>
To: 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>
Cc: linux-media@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Frank Li <Frank.Li@....com>, Guoniu Zhou <guoniu.zhou@....com>
Subject: [PATCH v4 4/4] media: imx8mq-mipi-csi2: Implement .get_frame_desc
 subdev callback

Implement .get_frame_desc subdev callback since downstream subdev
need to get frame description.

Signed-off-by: Guoniu Zhou <guoniu.zhou@....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 79c8b56c051eb96cf45bff8803041b294b8c4f89..bc30ba83fc97ee79e8fe87b58bf443e8aa4801fb 100644
--- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
+++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
@@ -670,6 +670,37 @@ 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,
 };
@@ -678,6 +709,7 @@ 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