Patch "drm/bridge: dpc3433: Don't log an error when DSI host can't be found" has been added to the 6.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/bridge: dpc3433: Don't log an error when DSI host can't be found

to the 6.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-dpc3433-don-t-log-an-error-when-dsi-host-.patch
and it can be found in the queue-6.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e8218dafb966fec3161dfa880cb2823ec0792fa8
Author: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
Date:   Mon Apr 15 17:49:35 2024 -0400

    drm/bridge: dpc3433: Don't log an error when DSI host can't be found
    
    [ Upstream commit 24f4f575214de776539d346b99b8717bffa8ebba ]
    
    Given that failing to find a DSI host causes the driver to defer probe,
    make use of dev_err_probe() to log the reason. This makes the defer
    probe reason available and avoids alerting userspace about something
    that is not necessarily an error.
    
    Also move the "failed to attach" error message so that it's only printed
    when the devm_mipi_dsi_attach() call fails.
    
    Fixes: 6352cd451ddb ("drm: bridge: Add TI DLPC3433 DSI to DMD bridge")
    Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
    Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
    Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
    Signed-off-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
    Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20240415-anx7625-defer-log-no-dsi-host-v3-7-619a28148e5c@xxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/ti-dlpc3433.c b/drivers/gpu/drm/bridge/ti-dlpc3433.c
index ca3348109bcd2..6b559e0713012 100644
--- a/drivers/gpu/drm/bridge/ti-dlpc3433.c
+++ b/drivers/gpu/drm/bridge/ti-dlpc3433.c
@@ -319,12 +319,11 @@ static int dlpc_host_attach(struct dlpc *dlpc)
 		.channel = 0,
 		.node = NULL,
 	};
+	int ret;
 
 	host = of_find_mipi_dsi_host_by_node(dlpc->host_node);
-	if (!host) {
-		DRM_DEV_ERROR(dev, "failed to find dsi host\n");
-		return -EPROBE_DEFER;
-	}
+	if (!host)
+		return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");
 
 	dlpc->dsi = mipi_dsi_device_register_full(host, &info);
 	if (IS_ERR(dlpc->dsi)) {
@@ -336,7 +335,11 @@ static int dlpc_host_attach(struct dlpc *dlpc)
 	dlpc->dsi->format = MIPI_DSI_FMT_RGB565;
 	dlpc->dsi->lanes = dlpc->dsi_lanes;
 
-	return devm_mipi_dsi_attach(dev, dlpc->dsi);
+	ret = devm_mipi_dsi_attach(dev, dlpc->dsi);
+	if (ret)
+		DRM_DEV_ERROR(dev, "failed to attach dsi host\n");
+
+	return ret;
 }
 
 static int dlpc3433_probe(struct i2c_client *client)
@@ -367,10 +370,8 @@ static int dlpc3433_probe(struct i2c_client *client)
 	drm_bridge_add(&dlpc->bridge);
 
 	ret = dlpc_host_attach(dlpc);
-	if (ret) {
-		DRM_DEV_ERROR(dev, "failed to attach dsi host\n");
+	if (ret)
 		goto err_remove_bridge;
-	}
 
 	return 0;