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FAILED: patch "[PATCH] media: staging: imx: configure src_mux in csi_start" failed to apply to 5.10-stable tree

PATCH [email protected] 1 participant 1 message May 15

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Stable branch Media (V4L/DVB) Arm i.MX and Layerscape Staging +1 more subsystems
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The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x ebeec2b000a90cd8aae86d1931ff5ef23af8284e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026051555-vanish-unharmed-059f@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ebeec2b000a90cd8aae86d1931ff5ef23af8284e Mon Sep 17 00:00:00 2001
From: Michael Tretter <[email protected]>
Date: Fri, 7 Nov 2025 11:34:34 +0100
Subject: [PATCH] media: staging: imx: configure src_mux in csi_start

After media_pipeline_start() was called, the media graph is assumed to be validated. It won't be validated again if a second stream starts.

The imx-media-csi driver, however, changes hardware configuration in the link_validate() callback. This can result in started streams with misconfigured hardware.

In the concrete example, the ipu2_csi1 is driven by a parallel video input. After the media pipeline has been started with this configuration, a second stream is configured to use ipu1_csi0 with MIPI-CSI input from imx6-mipi-csi2. This may require the reconfiguration of ipu1_csi0 with ipu_set_csi_src_mux(). Since the media pipeline is already running, link_validate won't be called, and the ipu1_csi0 won't be reconfigured. The resulting video is broken, because the ipu1_csi0 is misconfigured, but no error is reported.

Move ipu_set_csi_src_mux from csi_link_validate to csi_start to ensure that input to ipu1_csi0 is configured correctly when starting the stream. This is a local reconfiguration in ipu1_csi0 and is possible while the media pipeline is running.

Since csi_start() is called with priv->lock already locked, csi_set_src() must not lock priv->lock again. Thus, the mutex_lock() is dropped.

Signed-off-by Michael Tretter <[email protected]>
Fixes 4a34ec8e470c ("[media] media: imx: Add CSI subdev driver")
Cc [email protected]
Reviewed-by Frank Li <[email protected]>
Reviewed-by Philipp Zabel <[email protected]>
Signed-off-by Frank Li <[email protected]>
Signed-off-by Hans Verkuil <[email protected]>
drivers/staging/media/imx/imx-media-csi.c +24 -20
index dc594b286f73..ef22a083f8eb 100644
@@ -744,6 +744,28 @@ static int csi_setup(struct csi_priv *priv,
 	return 0;
 }
 
+static void csi_set_src(struct csi_priv *priv,
+			struct v4l2_mbus_config *mbus_cfg)
+{
+	bool is_csi2;
+
+	is_csi2 = !is_parallel_bus(mbus_cfg);
+	if (is_csi2) {
+		/*
+		 * NOTE! It seems the virtual channels from the mipi csi-2
+		 * receiver are used only for routing by the video mux's,
+		 * or for hard-wired routing to the CSI's. Once the stream
+		 * enters the CSI's however, they are treated internally
+		 * in the IPU as virtual channel 0.
+		 */
+		ipu_csi_set_mipi_datatype(priv->csi, 0,
+					  &priv->format_mbus[CSI_SINK_PAD]);
+	}
+
+	/* select either parallel or MIPI-CSI2 as input to CSI */
+	ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
+}
+
 static int csi_start(struct csi_priv *priv)
 {
 	struct v4l2_mbus_config mbus_cfg = { .type = 0 };

@@ -760,6 +782,8 @@ static int csi_start(struct csi_priv *priv)
 	input_fi = &priv->frame_interval[CSI_SINK_PAD];
 	output_fi = &priv->frame_interval[priv->active_output_pad];
 
+	csi_set_src(priv, &mbus_cfg);
+
 	/* start upstream */
 	ret = v4l2_subdev_call(priv->src_sd, video, s_stream, 1);
 	ret = (ret && ret != -ENOIOCTLCMD) ? ret : 0;

@@ -1130,7 +1154,6 @@ static int csi_link_validate(struct v4l2_subdev *sd,
 {
 	struct csi_priv *priv = v4l2_get_subdevdata(sd);
 	struct v4l2_mbus_config mbus_cfg = { .type = 0 };
-	bool is_csi2;
 	int ret;
 
 	ret = v4l2_subdev_link_validate_default(sd, link,

@@ -1145,25 +1168,6 @@ static int csi_link_validate(struct v4l2_subdev *sd,
 		return ret;
 	}
 
-	mutex_lock(&priv->lock);
-
-	is_csi2 = !is_parallel_bus(&mbus_cfg);
-	if (is_csi2) {
-		/*
-		 * NOTE! It seems the virtual channels from the mipi csi-2
-		 * receiver are used only for routing by the video mux's,
-		 * or for hard-wired routing to the CSI's. Once the stream
-		 * enters the CSI's however, they are treated internally
-		 * in the IPU as virtual channel 0.
-		 */
-		ipu_csi_set_mipi_datatype(priv->csi, 0,
-					  &priv->format_mbus[CSI_SINK_PAD]);
-	}
-
-	/* select either parallel or MIPI-CSI2 as input to CSI */
-	ipu_set_csi_src_mux(priv->ipu, priv->csi_id, is_csi2);
-
-	mutex_unlock(&priv->lock);
 	return ret;
 }