Patch "drm/bridge: lt9611uxc: Switch to devm MIPI-DSI helpers" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    drm/bridge: lt9611uxc: Switch to devm MIPI-DSI helpers

to the 5.15-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-lt9611uxc-switch-to-devm-mipi-dsi-helpers.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 3efc5c224d70063d85d9dbedcf4c850335afe2c8
Author: Maxime Ripard <mripard@xxxxxxxxxx>
Date:   Mon Oct 25 17:15:24 2021 +0200

    drm/bridge: lt9611uxc: Switch to devm MIPI-DSI helpers
    
    [ Upstream commit 293ada7b058e536d9d53d0d8840c6ba8c2f718e4 ]
    
    Let's switch to the new devm MIPI-DSI function to register and attach
    our secondary device.
    
    Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
    Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20211025151536.1048186-10-maxime@xxxxxxxxxx
    Stable-dep-of: 15fe53be46ea ("drm/bridge: lt9611uxc: fix the race in the error path")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index c4454d0f6cad5..b58842f69fff1 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -258,17 +258,18 @@ static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
 	const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
 	struct mipi_dsi_device *dsi;
 	struct mipi_dsi_host *host;
+	struct device *dev = lt9611uxc->dev;
 	int ret;
 
 	host = of_find_mipi_dsi_host_by_node(dsi_node);
 	if (!host) {
-		dev_err(lt9611uxc->dev, "failed to find dsi host\n");
+		dev_err(dev, "failed to find dsi host\n");
 		return ERR_PTR(-EPROBE_DEFER);
 	}
 
-	dsi = mipi_dsi_device_register_full(host, &info);
+	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
 	if (IS_ERR(dsi)) {
-		dev_err(lt9611uxc->dev, "failed to create dsi device\n");
+		dev_err(dev, "failed to create dsi device\n");
 		return dsi;
 	}
 
@@ -277,10 +278,9 @@ static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 			  MIPI_DSI_MODE_VIDEO_HSE;
 
-	ret = mipi_dsi_attach(dsi);
+	ret = devm_mipi_dsi_attach(dev, dsi);
 	if (ret < 0) {
-		dev_err(lt9611uxc->dev, "failed to attach dsi to host\n");
-		mipi_dsi_device_unregister(dsi);
+		dev_err(dev, "failed to attach dsi to host\n");
 		return ERR_PTR(ret);
 	}
 
@@ -355,19 +355,6 @@ static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc
 	return drm_connector_attach_encoder(&lt9611uxc->connector, bridge->encoder);
 }
 
-static void lt9611uxc_bridge_detach(struct drm_bridge *bridge)
-{
-	struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
-
-	if (lt9611uxc->dsi1) {
-		mipi_dsi_detach(lt9611uxc->dsi1);
-		mipi_dsi_device_unregister(lt9611uxc->dsi1);
-	}
-
-	mipi_dsi_detach(lt9611uxc->dsi0);
-	mipi_dsi_device_unregister(lt9611uxc->dsi0);
-}
-
 static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
 				   enum drm_bridge_attach_flags flags)
 {
@@ -388,19 +375,11 @@ static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
 	/* Attach secondary DSI, if specified */
 	if (lt9611uxc->dsi1_node) {
 		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
-		if (IS_ERR(lt9611uxc->dsi1)) {
-			ret = PTR_ERR(lt9611uxc->dsi1);
-			goto err_unregister_dsi0;
-		}
+		if (IS_ERR(lt9611uxc->dsi1))
+			return PTR_ERR(lt9611uxc->dsi1);
 	}
 
 	return 0;
-
-err_unregister_dsi0:
-	mipi_dsi_detach(lt9611uxc->dsi0);
-	mipi_dsi_device_unregister(lt9611uxc->dsi0);
-
-	return ret;
 }
 
 static enum drm_mode_status
@@ -544,7 +523,6 @@ static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
 
 static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
 	.attach = lt9611uxc_bridge_attach,
-	.detach = lt9611uxc_bridge_detach,
 	.mode_valid = lt9611uxc_bridge_mode_valid,
 	.mode_set = lt9611uxc_bridge_mode_set,
 	.detect = lt9611uxc_bridge_detect,