linux-kernel - [PATCH 5/6] media: i2c: imx219: Report streams using frame descriptors

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Message-ID: <20250220141739.228714-6-demonsingur@gmail.com>
Date: Thu, 20 Feb 2025 16:17:27 +0200
From: Cosmin Tanislav <demonsingur@...il.com>
To: 
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] media: i2c: imx219: Report streams using frame descriptors

From: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Implement the .get_frame_desc() subdev operation to report information
about streams to the connected CSI-2 receiver. This is required to let
the CSI-2 receiver driver know about virtual channels and data types for
each stream.

Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
---
 drivers/media/i2c/imx219.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index ad1965a91ae3c..4c4ebe54f191b 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -23,6 +23,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 
+#include <media/mipi-csi2.h>
 #include <media/v4l2-cci.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
@@ -990,6 +991,28 @@ static int imx219_init_state(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int imx219_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
+				 struct v4l2_mbus_frame_desc *fd)
+{
+	struct v4l2_subdev_state *state;
+	u32 code;
+
+	state = v4l2_subdev_lock_and_get_active_state(sd);
+	code = v4l2_subdev_state_get_format(state, 0)->code;
+	v4l2_subdev_unlock_state(state);
+
+	fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2;
+	fd->num_entries = 1;
+
+	fd->entry[0].pixelcode = code;
+	fd->entry[0].stream = 0;
+	fd->entry[0].bus.csi2.vc = 0;
+	fd->entry[0].bus.csi2.dt = imx219_get_format_bpp(code) == 8
+				 ? MIPI_CSI2_DT_RAW8 : MIPI_CSI2_DT_RAW10;
+
+	return 0;
+}
+
 static const struct v4l2_subdev_video_ops imx219_video_ops = {
 	.s_stream = imx219_set_stream,
 };
@@ -1000,6 +1023,7 @@ static const struct v4l2_subdev_pad_ops imx219_pad_ops = {
 	.set_fmt = imx219_set_pad_format,
 	.get_selection = imx219_get_selection,
 	.enum_frame_size = imx219_enum_frame_size,
+	.get_frame_desc = imx219_get_frame_desc,
 };
 
 static const struct v4l2_subdev_ops imx219_subdev_ops = {
-- 
2.48.1