From: Hansen Dsouza <Hansen.Dsouza@xxxxxxx>
[Why & How]
Read if panel support multi-sst links
Reviewed-by: Charlene Liu <charlene.liu@xxxxxxx>
Signed-off-by: Hansen Dsouza <Hansen.Dsouza@xxxxxxx>
Signed-off-by: Wayne Lin <wayne.lin@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 2 ++
.../display/dc/link/protocols/link_dp_capability.c | 11 +++++++++++
2 files changed, 13 insertions(+)
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 8bb628ab7855..22c2173c687f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h
@@ -1220,6 +1220,8 @@ struct dpcd_caps {
struct replay_info pr_info;
uint16_t edp_oled_emission_rate;
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;
};
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 0785c030f6a6..da19f6a3b42b 100644
--- 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
@@ -2100,6 +2100,17 @@ void detect_edp_sink_caps(struct dc_link *link)
core_link_read_dpcd(link, DP_SINK_EMISSION_RATE,
(uint8_t *)&link->dpcd_caps.edp_oled_emission_rate,
sizeof(link->dpcd_caps.edp_oled_emission_rate));
+
+ /*
+ * Read Multi-SST (Single Stream Transport) capability
+ * for eDP version 1.4 or higher.
+ */
+ if (link->dpcd_caps.dpcd_rev.raw >= DP_EDP_14)
+ core_link_read_dpcd(
+ 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));
}
bool dp_get_max_link_enc_cap(const struct dc_link *link, struct dc_link_settings *max_link_enc_cap)
--
2.37.3
