[PATCH] drm/bridge: tc358767: Handle bridge past DPI output

[Marek Vasut]

Currently the driver only handles panel directly connected to the DPI output.
Handle the case where a bridge is connected past DPI output of this bridge.
This could be e.g. DPI to LVDS encoder chip.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Jonas Karlman <jonas at kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Maxime Ripard <maxime at cerno.tech>
Cc: Neil Armstrong <narmstrong at baylibre.com>
Cc: Robert Foss <robert.foss at linaro.org>
Cc: Sam Ravnborg <sam at ravnborg.org>
---
 drivers/gpu/drm/bridge/tc358767.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index f8c1cd711753b..814ab206fe7ef 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1926,22 +1926,23 @@ static int tc_mipi_dsi_host_attach(struct tc_data *tc)
 static int tc_probe_dpi_bridge_endpoint(struct tc_data *tc)
 {
 	struct device *dev = tc->dev;
+	struct drm_bridge *bridge;
 	struct drm_panel *panel;
 	int ret;
 
 	/* port at 1 is the DPI input/output port */
-	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, &bridge);
 	if (ret && ret != -ENODEV)
 		return ret;
 
 	if (panel) {
-		struct drm_bridge *panel_bridge;
-
-		panel_bridge = devm_drm_panel_bridge_add(dev, panel);
-		if (IS_ERR(panel_bridge))
-			return PTR_ERR(panel_bridge);
+		bridge = devm_drm_panel_bridge_add(dev, panel);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
+	}
 
-		tc->panel_bridge = panel_bridge;
+	if (bridge) {
+		tc->panel_bridge = bridge;
 		tc->bridge.type = DRM_MODE_CONNECTOR_DPI;
 		tc->bridge.funcs = &tc_dpi_bridge_funcs;
 
-- 
2.35.1