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drm/i915/dp_mst: Set connector DSC capabilities and decompression AUX

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Similarly to eDP and SST-DP connectors read out the DSC capabilities for
MST connectors as well. Atm these will match the root port's DSC caps
and only used after a follow-up change enables the decompression for
each stream separately (vs. the current way of enabling it only globally
in the first branch device downstream of the root port).

Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231010112504.2156789-3-imre.deak@intel.com
This commit is contained in:
Imre Deak 2023-10-10 14:25:03 +03:00
parent 7389829f21
commit 808b43fa7e
3 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -3483,8 +3483,8 @@ static void intel_dp_read_dsc_dpcd(struct drm_dp_aux *aux,
dsc_dpcd);
}
static void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
struct intel_connector *connector)
void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
struct intel_connector *connector)
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);

3
drivers/gpu/drm/i915/display/intel_dp.h
View File

@ -162,4 +162,7 @@ intel_dp_compute_config_link_bpp_limits(struct intel_dp *intel_dp,
bool dsc,
struct link_config_limits *limits);
void intel_dp_get_dsc_sink_cap(u8 dpcd_rev, struct intel_dp *intel_dp,
struct intel_connector *connector);
#endif /* __INTEL_DP_H__ */

23
drivers/gpu/drm/i915/display/intel_dp_mst.c
View File

@ -1126,6 +1126,21 @@ static int intel_dp_mst_add_properties(struct intel_dp *intel_dp,
return drm_connector_set_path_property(connector, pathprop);
}
static void
intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
struct intel_connector *connector)
{
u8 dpcd_caps[DP_RECEIVER_CAP_SIZE];
if (!connector->dp.dsc_decompression_aux)
return;
if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
return;
intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], intel_dp, connector);
}
static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port,
const char *pathprop)
@ -1159,6 +1174,14 @@ 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;