drm/i915: Fix the i915_dsc_fec_support debugfs file for DP MST connectors

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@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200609184140.4937-1-imre.deak@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 3d9dc27478b334d024b2cd5b569d1cd4dfaf811a..852f64946b96bf6ac6be1346274c11c0d6982b13 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -2224,7 +2224,8 @@ 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);