diff options
| author | Imre Deak <imre.deak@intel.com> | 2023-10-30 00:13:08 +0100 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2023-11-20 10:06:34 +0100 |
| commit | 018903e1cec3421a6198589fabd30682eb277904 (patch) | |
| tree | 5ed28b4f20c307e59545b8bf9bdc3fe46bdc9b34 /drivers | |
| parent | Linux 6.7-rc2 (diff) | |
| download | linux-018903e1cec3421a6198589fabd30682eb277904.tar.xz linux-018903e1cec3421a6198589fabd30682eb277904.zip | |
drm/i915/dp_mst: Fix race between connector registration and setup
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: 808b43fa7e56 ("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
(cherry picked from commit 560ea72c76eb6d0c59f77580414e64cc09f1093d)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_mst.c | 16 |
1 files 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 7b4628f4f124..851b312bd844 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; |