When using DCSS with NWL, overriding the mode flags to enforce active high
sync is preventing the use of active low with downstream bridges, such as
ti-sn65dsi83, which will not see such mode flags set by the panel.
Fixes: 44cfc6233447 ("drm/bridge: Add NWL MIPI DSI host controller support")
Cc: [email protected]
Signed-off-by: Esben Haabendal <[email protected]>
---
drivers/gpu/drm/bridge/nwl-dsi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 39be58cf5bd2..374884e76f25 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -823,10 +823,13 @@ static int nwl_dsi_bridge_atomic_check(struct drm_bridge
*bridge,
struct drm_connector_state *conn_state)
{
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+ struct nwl_dsi *dsi = bridge_to_dsi(bridge);
/* At least LCDIF + NWL needs active high sync */
- adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
- adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+ if (dsi->endpoint == NWL_DSI_ENDPOINT_LCDIF) {
+ adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
DRM_MODE_FLAG_PVSYNC);
+ adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC |
DRM_MODE_FLAG_NVSYNC);
+ }
/*
* Do a full modeset if crtc_state->active is changed to be true.
--
2.55.0
