[Intel-gfx] [PATCH] drm/i915: Fix the i915_dsc_fec_support debugfs file for DP MST connectors

[Imre Deak]

DSC is not supported on DP MST streams so just don't add this entry for
MST connectors.

This also fixes an OOPS, caused by the encoder->digport cast, which is
not valid for MST encoders.

v2:
- Check encoder, which is unset for an MST connector, before it gets
  enabled.
v3:
- Just don't add this debugfs file for MST connectors. (Ville)

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_debugfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 2b640d8ab9d2..28dd717e943a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -2218,7 +2218,8 @@ int intel_connector_debugfs_add(struct drm_connector *connector)
 	}
 
 	if (INTEL_GEN(dev_priv) >= 10 &&
-	    (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+	    ((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort &&
+	      !to_intel_connector(connector)->mst_port) ||
 	     connector->connector_type == DRM_MODE_CONNECTOR_eDP))
 		debugfs_create_file("i915_dsc_fec_support", S_IRUGO, root,
 				    connector, &i915_dsc_fec_support_fops);
-- 
2.23.1