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From 688eb4d465484bc2a3471a6a6f06f833b58c7867 Mon Sep 17 00:00:00 2001
From: Aradhya Bhatia <a-bhatia1@ti.com>
Date: Sat, 29 Mar 2025 17:09:12 +0530
Subject: drm/bridge: cdns-dsi: Fix connecting to next bridge
From: Aradhya Bhatia <a-bhatia1@ti.com>
commit 688eb4d465484bc2a3471a6a6f06f833b58c7867 upstream.
Fix the OF node pointer passed to the of_drm_find_bridge() call to find
the next bridge in the display chain.
The code to find the next panel (and create its panel-bridge) works
fine, but to find the next (non-panel) bridge does not.
To find the next bridge in the pipeline, we need to pass "np" - the OF
node pointer of the next entity in the devicetree chain. Passing
"of_node" to of_drm_find_bridge (which is what the code does currently)
will fetch the bridge for the cdns-dsi which is not what's required.
Fix that.
Fixes: e19233955d9e ("drm/bridge: Add Cadence DSI driver")
Cc: stable@vger.kernel.org
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
Link: https://lore.kernel.org/r/20250329113925.68204-2-aradhya.bhatia@linux.dev
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -958,7 +958,7 @@ static int cdns_dsi_attach(struct mipi_d
bridge = drm_panel_bridge_add_typed(panel,
DRM_MODE_CONNECTOR_DSI);
} else {
- bridge = of_drm_find_bridge(dev->dev.of_node);
+ bridge = of_drm_find_bridge(np);
if (!bridge)
bridge = ERR_PTR(-EINVAL);
}
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