tc358767 driver does not set DRM bus_flags, even if it does configures
the polarity settings into its registers. This means that the DPI source
can't configure the polarities correctly.

Add sync flags accordingly.

Signed-off-by: Tomi Valkeinen <tomi.valkei...@ti.com>
Reviewed-by: Andrzej Hajda <a.ha...@samsung.com>
---
 drivers/gpu/drm/bridge/tc358767.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/bridge/tc358767.c 
b/drivers/gpu/drm/bridge/tc358767.c
index 8e28e738cb52..29a7e33e8ae0 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1195,6 +1195,10 @@ static int tc_bridge_attach(struct drm_bridge *bridge)
 
        drm_display_info_set_bus_formats(&tc->connector.display_info,
                                         &bus_format, 1);
+       tc->connector.display_info.bus_flags =
+               DRM_BUS_FLAG_DE_HIGH |
+               DRM_BUS_FLAG_PIXDATA_NEGEDGE |
+               DRM_BUS_FLAG_SYNC_NEGEDGE;
        drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
 
        return 0;
-- 
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