drm/amd/display: Read DPCD to obtain eDP capability information.

[Why & How]
Extend to read eDP general capability 2 in detect_edp_sink_caps().

Reviewed-by: Robin Chen <robin.chen@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Allen Li <wei-guang.li@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
index 3a3ec38cdf8be09a11b92dc16740c32bb9ba0c4d..db669ccb1d587fd9f440ae5b071cd2705c2c24f6 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
@@ -1284,6 +1284,7 @@ struct dpcd_caps {
        union dp_receive_port0_cap receive_port0_cap;
        /* Indicates the number of SST links supported by MSO (Multi-Stream Output) */
        uint8_t mso_cap_sst_links_supported;
+       uint8_t dp_edp_general_cap_2;
 };
 
 union dpcd_sink_ext_caps {

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 caddb7dfb1334b0e7199f48d416adaf3a0cccd46..b12c11bd6a1498777959896c1dc8e5ea8e2453c7 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
@@ -2195,6 +2195,12 @@ void detect_edp_sink_caps(struct dc_link *link)
                        DP_EDP_MSO_LINK_CAPABILITIES,
                        (uint8_t *)&link->dpcd_caps.mso_cap_sst_links_supported,
                        sizeof(link->dpcd_caps.mso_cap_sst_links_supported));
+       /*
+        * Read eDP general capability 2
+        */
+       core_link_read_dpcd(link, DP_EDP_GENERAL_CAP_2,
+                       (uint8_t *)&link->dpcd_caps.dp_edp_general_cap_2,
+                       sizeof(link->dpcd_caps.dp_edp_general_cap_2));
 }
 
 bool dp_get_max_link_enc_cap(const struct dc_link *link, struct dc_link_settings *max_link_enc_cap)