drm/amd/display: Check & log if receiver supports MST, DSC & FEC.

After reading from receiver via DPCD, check & log if it supports MST,
DSC & FEC

Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
index 6d2d10da2b77ceaeb8c1203b239168d386122a79..2914fca7dab30bc1656c27ffec02e4fbb5e2d43d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c
@@ -1552,6 +1552,9 @@ static bool retrieve_link_cap(struct dc_link *link)
        int i;
        struct dp_sink_hw_fw_revision dp_hw_fw_revision;
        const uint32_t post_oui_delay = 30; // 30ms
+       bool is_fec_supported = false;
+       bool is_dsc_basic_supported = false;
+       bool is_dsc_passthrough_supported = false;
 
        memset(dpcd_data, '\0', sizeof(dpcd_data));
        memset(&down_strm_port_count,
@@ -1694,6 +1697,7 @@ static bool retrieve_link_cap(struct dc_link *link)
 
        /* TODO - decouple raw mst capability from policy decision */
        link->dpcd_caps.is_mst_capable = read_is_mst_supported(link);
+       DC_LOG_DC("%s: MST_Support: %s\n", __func__, str_yes_no(link->dpcd_caps.is_mst_capable));
 
        get_active_converter_info(ds_port.byte, link);
 
@@ -1801,6 +1805,18 @@ static bool retrieve_link_cap(struct dc_link *link)
                                DP_DSC_SUPPORT,
                                link->dpcd_caps.dsc_caps.dsc_basic_caps.raw,
                                sizeof(link->dpcd_caps.dsc_caps.dsc_basic_caps.raw));
+               if (status == DC_OK) {
+                       is_fec_supported = link->dpcd_caps.fec_cap.bits.FEC_CAPABLE;
+                       is_dsc_basic_supported = link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT;
+                       is_dsc_passthrough_supported = link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT;
+                       DC_LOG_DC("%s: FEC_Sink_Support: %s\n", __func__,
+                                 str_yes_no(is_fec_supported));
+                       DC_LOG_DC("%s: DSC_Basic_Sink_Support: %s\n", __func__,
+                                 str_yes_no(is_dsc_basic_supported));
+                       if (link->dpcd_caps.is_mst_capable)
+                               DC_LOG_DC("%s: DSC_Passthrough_Sink_Support: %s\n", __func__,
+                                         str_yes_no(is_dsc_passthrough_supported));
+               }
                if (link->dpcd_caps.dongle_type != DISPLAY_DONGLE_NONE) {
                        status = core_link_read_dpcd(
                                        link,