On Fri, Oct 06, 2023 at 04:37:11PM +0300, Imre Deak wrote: > 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). > > Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: Stanislav Lisovskiy <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_dp.c | 4 ++-- > drivers/gpu/drm/i915/display/intel_dp.h | 3 +++ > drivers/gpu/drm/i915/display/intel_dp_mst.c | 23 +++++++++++++++++++++ > 3 files changed, 28 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c > b/drivers/gpu/drm/i915/display/intel_dp.c > index c7dd65a27a1b0..6e6b3fe593453 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -3467,8 +3467,8 @@ bool intel_dp_get_colorimetry_status(struct intel_dp > *intel_dp) > return dprx & DP_VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED; > } > > -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); > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.h > b/drivers/gpu/drm/i915/display/intel_dp.h > index 2cf3681bac64a..bd9cb9680b4cd 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.h > +++ b/drivers/gpu/drm/i915/display/intel_dp.h > @@ -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__ */ > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c > b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index 73e3977364632..e01f669d2c8a1 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -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; > -- > 2.39.2 >
