drm/amd/display: Enable SST DSC in DM

In create_stream_for_sink, check for SST DP connectors

Parse DSC caps to DC format, then, if DSC is supported,
compute the config

DSC hardware will be programmed by dc_commit_state

Tested-by: Mikita Lipski <Mikita.Lipski@amd.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 4529826..6590317 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3517,6 +3517,10 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
        bool scale = dm_state ? (dm_state->scaling != RMX_OFF) : false;
        int mode_refresh;
        int preferred_refresh = 0;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+       struct dsc_dec_dpcd_caps dsc_caps;
+       uint32_t link_bandwidth_kbps;
+#endif
 
        struct dc_sink *sink = NULL;
        if (aconnector == NULL) {
@@ -3589,17 +3593,23 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
                        &mode, &aconnector->base, con_state, old_stream);
 
 #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
-       /* stream->timing.flags.DSC = 0; */
-        /*  */
-       /* if (aconnector->dc_link && */
-       /*              aconnector->dc_link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT #<{(|&& */
-       /*              aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.is_dsc_supported|)}>#) */
-       /*      if (dc_dsc_compute_config(aconnector->dc_link->ctx->dc, */
-       /*                      &aconnector->dc_link->dpcd_caps.dsc_caps, */
-       /*                      dc_link_bandwidth_kbps(aconnector->dc_link, dc_link_get_link_cap(aconnector->dc_link)), */
-       /*                      &stream->timing, */
-       /*                      &stream->timing.dsc_cfg)) */
-       /*              stream->timing.flags.DSC = 1; */
+       stream->timing.flags.DSC = 0;
+
+       if (aconnector->dc_link && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT) {
+               dc_dsc_parse_dsc_dpcd(aconnector->dc_link->dpcd_caps.dsc_caps.dsc_basic_caps.raw,
+                                     aconnector->dc_link->dpcd_caps.dsc_caps.dsc_ext_caps.raw,
+                                     &dsc_caps);
+               link_bandwidth_kbps = dc_link_bandwidth_kbps(aconnector->dc_link,
+                                                            dc_link_get_link_cap(aconnector->dc_link));
+
+               if (dsc_caps.is_dsc_supported)
+                       if (dc_dsc_compute_config(aconnector->dc_link->ctx->dc,
+                                                 &dsc_caps,
+                                                 link_bandwidth_kbps,
+                                                 &stream->timing,
+                                                 &stream->timing.dsc_cfg))
+                               stream->timing.flags.DSC = 1;
+       }
 #endif
 
        update_stream_scaling_settings(&mode, dm_state, stream);

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index a0ed015..ee1dc75 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -548,7 +548,9 @@ bool dm_helpers_dp_write_dsc_enable(
                bool enable
 )
 {
-       return false;
+       uint8_t enable_dsc = enable ? 1 : 0;
+
+       return dm_helpers_dp_write_dpcd(ctx, stream->sink->link, DP_DSC_ENABLE, &enable_dsc, 1);
 }
 #endif