[Intel-gfx] [PATCH 3/4] drm/i915/mst: Reject modes that require the bigjoiner

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We have no bigjoiner support in the MST code, so .mode_valid()
pretending otherwise is just going to result black screens for
users. Reject any mode that needs the joiner.

Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Fixes: d51f25eb479a ("drm/i915: Add DSC support to MST path")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 0680a42f7d2a..b665fe6ef871 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1332,6 +1332,10 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 	if (intel_dp_need_bigjoiner(intel_dp, mode->hdisplay, target_clock)) {
 		bigjoiner = true;
 		max_dotclk *= 2;
+
+		/* TODO: add support for bigjoiner */
+		*status = MODE_CLOCK_HIGH;
+		return 0;
 	}
 
 	if (DISPLAY_VER(dev_priv) >= 10 &&
-- 
2.41.0