drm/amd/display: Adjust AUX-less ALPM setting

Duncan Ma · alexdeucher · commit fd20627c7499 · 2025-08-04T14:38:29.000-04:00
[Why &amp; How]
Change ACDS period to support LTTPR.

Reviewed-by: Charlene Liu &lt;charlene.liu@amd.com&gt;
Signed-off-by: Duncan Ma &lt;Duncan.Ma@amd.com&gt;
Signed-off-by: Roman Li &lt;roman.li@amd.com&gt;
Tested-by: Daniel Wheeler &lt;daniel.wheeler@amd.com&gt;
Signed-off-by: Alex Deucher &lt;alexander.deucher@amd.com&gt;
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
@@ -1046,7 +1046,7 @@ bool edp_setup_replay(struct dc_link *link, const struct dc_stream_state *stream
 
 		if (link->replay_settings.config.alpm_mode == DC_ALPM_AUXLESS) {
 			alpm_config.bits.ALPM_MODE_SEL = 1;
-			alpm_config.bits.ACDS_PERIOD_DURATION = 1;
+			alpm_config.bits.ACDS_PERIOD_DURATION = 0;
 		}
 
 		dm_helpers_dp_write_dpcd(

Original file line number	Diff line number	Diff line change
`@@ -1046,7 +1046,7 @@ bool edp_setup_replay(struct dc_link link, const struct dc_stream_state stream`
`1046`	`1046`
`1047`	`1047`	`if (link->replay_settings.config.alpm_mode == DC_ALPM_AUXLESS) {`
`1048`	`1048`	`alpm_config.bits.ALPM_MODE_SEL = 1;`
`1049`		`- alpm_config.bits.ACDS_PERIOD_DURATION = 1;`
	`1049`	`+ alpm_config.bits.ACDS_PERIOD_DURATION = 0;`
`1050`	`1050`	`}`
`1051`	`1051`
`1052`	`1052`	`dm_helpers_dp_write_dpcd(`