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drm/i915/dp_mst: Fix race between connector registration and setup

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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@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Fixes: 808b43fa7e ("drm/i915/dp_mst: Set connector DSC capabilities and decompression AUX")
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231030155843.2251023-2-imre.deak@intel.com
This commit is contained in:
Imre Deak
2023-10-30 01:13:08 +02:00
parent 607a2c64e8
commit 560ea72c76
1 changed files with 8 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@@ -1168,6 +1168,14 @@ 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);
@@ -1179,14 +1187,6 @@ 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;