drm/bridge: tc358767: Fix DP bridge mode detection from DT endpoints

Per toshiba,tc358767.yaml DT binding document, port@2 the output (e)DP
port is optional. In case this port is not described in DT, the bridge
driver operates in DPI-to-DP mode. Make sure the driver treats this as
a valid mode of operation instead of reporting invalid mode.

Fixes: 71f7d9c03118 ("drm/bridge: tc358767: Detect bridge mode from connected endpoints in DT")
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: Marek Vasut <marex@denx.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: Lucas Stach <l.stach@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220429204625.241591-1-marex@denx.de

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 7dde713..485717c 100644 (file)
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1964,7 +1964,9 @@ static int tc_probe_bridge_endpoint(struct tc_data *tc)
        struct of_endpoint endpoint;
        struct device_node *node = NULL;
        const u8 mode_dpi_to_edp = BIT(1) | BIT(2);
+       const u8 mode_dpi_to_dp = BIT(1);
        const u8 mode_dsi_to_edp = BIT(0) | BIT(2);
+       const u8 mode_dsi_to_dp = BIT(0);
        const u8 mode_dsi_to_dpi = BIT(0) | BIT(1);
        u8 mode = 0;
 
@@ -1990,11 +1992,11 @@ static int tc_probe_bridge_endpoint(struct tc_data *tc)
                mode |= BIT(endpoint.port);
        }
 
-       if (mode == mode_dpi_to_edp)
+       if (mode == mode_dpi_to_edp || mode == mode_dpi_to_dp)
                return tc_probe_edp_bridge_endpoint(tc);
        else if (mode == mode_dsi_to_dpi)
                return tc_probe_dpi_bridge_endpoint(tc);
-       else if (mode == mode_dsi_to_edp)
+       else if (mode == mode_dsi_to_edp || mode == mode_dsi_to_dp)
                dev_warn(dev, "The mode DSI-to-(e)DP is not supported!\n");
        else
                dev_warn(dev, "Invalid mode (0x%x) is not supported!\n", mode);