[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 <ma...@denx.de>
Cc: Jonas Karlman <jo...@kwiboo.se>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: Lucas Stach <l.st...@pengutronix.de>
Cc: Maxime Ripard <max...@cerno.tech>
Cc: Neil Armstrong <narmstr...@baylibre.com>
Cc: Robert Foss <robert.f...@linaro.org>
Cc: Sam Ravnborg <s...@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@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