drm/bridge: tc358767: Handle bridge past DPI output

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@denx.de>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220724224317.288727-1-marex@denx.de

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index baaed4d..89e060b 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1913,22 +1913,23 @@ 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@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;