drm/bridge: cdns-dsi: Fix connecting to next bridge

commit 688eb4d 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: e192339 ("drm/bridge: Add Cadence DSI driver")
Cc: [email protected]
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Tomi Valkeinen <[email protected]>
Tested-by: Tomi Valkeinen <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Aradhya Bhatia

drivers/gpu/drm/bridge/cdns-dsi.c

@@ -992,7 +992,7 @@ static int cdns_dsi_attach(struct mipi_dsi_host *host,
 		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);
 	}