[WHY]
New register field added in DP2.1 SCR, needed for auxless ALPM
[HOW]
Echo value read from 0xF0007 back to sink
Reviewed-by: Wenjing Liu <wenjing.liu@xxxxxxx>
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
Signed-off-by: Michael Strauss <michael.strauss@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
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 00974c50e11f..f1cac74dd7f7 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
@@ -1605,9 +1605,17 @@ static bool retrieve_link_cap(struct dc_link *link)
return false;
}
- if (dp_is_lttpr_present(link))
+ if (dp_is_lttpr_present(link)) {
configure_lttpr_mode_transparent(link);
+ // Echo TOTAL_LTTPR_CNT back downstream
+ core_link_write_dpcd(
+ link,
+ DP_TOTAL_LTTPR_CNT,
+ &link->dpcd_caps.lttpr_caps.phy_repeater_cnt,
+ sizeof(link->dpcd_caps.lttpr_caps.phy_repeater_cnt));
+ }
+
/* Read DP tunneling information. */
status = dpcd_get_tunneling_device_data(link);
diff --git a/drivers/gpu/drm/amd/display/include/dpcd_defs.h b/drivers/gpu/drm/amd/display/include/dpcd_defs.h
index 914f28e9f224..aee5170f5fb2 100644
--- a/drivers/gpu/drm/amd/display/include/dpcd_defs.h
+++ b/drivers/gpu/drm/amd/display/include/dpcd_defs.h
@@ -177,4 +177,9 @@ enum dpcd_psr_sink_states {
#define DP_SINK_PR_PIXEL_DEVIATION_PER_LINE 0x379
#define DP_SINK_PR_MAX_NUMBER_OF_DEVIATION_LINE 0x37A
+/* Remove once drm_dp_helper.h is updated upstream */
+#ifndef DP_TOTAL_LTTPR_CNT
+#define DP_TOTAL_LTTPR_CNT 0xF000A /* 2.1 */
+#endif
+
#endif /* __DAL_DPCD_DEFS_H__ */
