[PATCH v3 2/5] drm/bridge: nwl-dsi: Limit LCDIF specific sync override

[Esben Haabendal]

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: stable@xxxxxxxxxxxxxxx
Signed-off-by: Esben Haabendal <esben@xxxxxxxxxx>
---
 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