After drm_connector_init() is called the connector is visible to the
rest of the kernel via the drm_mode_config::connector_list. Make
sure that the DSC AUX device and capabilities are setup by that time.
Another race condition is adding the connector to the connector list
before drm_connector_helper_add() sets the connector helper functions.
That's an unrelated issue, for which the fix is for a follow-up. One
solution would be adding the connector to the connector list only
during its registration in drm_connector_register().
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Fixes: 808b43fa7e56 ("drm/i915/dp_mst: Set connector DSC capabilities and decompression AUX")
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 7b4628f4f1240..851b312bd8449 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1161,6 +1161,14 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
intel_connector->port = port;
drm_dp_mst_get_port_malloc(port);
+ /*
+ * TODO: set the AUX for the actual MST port decompressing the stream.
+ * At the moment the driver only supports enabling this globally in the
+ * first downstream MST branch, via intel_dp's (root port) AUX.
+ */
+ intel_connector->dp.dsc_decompression_aux = &intel_dp->aux;
+ intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
+
connector = &intel_connector->base;
ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
@@ -1172,14 +1180,6 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
- /*
- * TODO: set the AUX for the actual MST port decompressing the stream.
- * At the moment the driver only supports enabling this globally in the
- * first downstream MST branch, via intel_dp's (root port) AUX.
- */
- intel_connector->dp.dsc_decompression_aux = &intel_dp->aux;
- intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
-
for_each_pipe(dev_priv, pipe) {
struct drm_encoder *enc =
&intel_dp->mst_encoders[pipe]->base.base;
--
2.39.2
