Disable FRL on shutdown

Author: mkopec

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -3240,6 +3240,23 @@ static int dm_suspend(struct amdgpu_ip_block *ip_block)
 
 	hpd_rx_irq_work_suspend(dm);
 
+	/* On a full machine shutdown (not suspend/resume), notify any connected
+	 * HDMI FRL sinks to stop expecting an FRL signal. This allows the sink
+	 * to fall back to TMDS immediately rather than waiting for a timeout.
+	 * Skip during suspend/resume — we will retrain FRL on resume anyway.
+	 */
+	if (adev->mp1_state == PP_MP1_STATE_UNLOAD) {
+		int i;
+
+		for (i = 0; i < dm->dc->link_count; i++) {
+			struct dc_link *link = dm->dc->links[i];
+
+			if (dc_is_hdmi_frl_signal(link->connector_signal) &&
+			    link->local_sink)
+				dm->dc->link_srv->hdmi_frl_disable(link);
+		}
+	}
+
 	dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);
 
 	if (dm->dc->caps.ips_support && adev->in_s0ix)

drivers/gpu/drm/amd/display/dc/inc/link_service.h

@@ -347,5 +347,8 @@ struct link_service {
 	uint64_t (*dp_trace_get_edp_poweroff_timestamp)(struct dc_link *link);
 	void (*dp_trace_source_sequence)(
 			struct dc_link *link, uint8_t dp_test_mode);
+
+	/*************************** HDMI FRL *********************************/
+	void (*hdmi_frl_disable)(struct dc_link *link);
 };
 #endif /* __DC_LINK_HPD_H__ */

drivers/gpu/drm/amd/display/dc/link/link_factory.c

@@ -43,6 +43,7 @@
 #include "protocols/link_edp_panel_control.h"
 #include "protocols/link_dp_panel_replay.h"
 #include "protocols/link_hpd.h"
+#include "protocols/link_frl_training.h"
 #include "gpio_service_interface.h"
 #include "atomfirmware.h"
 
@@ -259,6 +260,11 @@ static void construct_link_service_dp_cts(struct link_service *link_srv)
 /* link dp trace implements tracing interfaces for tracking major dp sequences
  * including execution status and timestamps
  */
+static void construct_link_service_hdmi_frl(struct link_service *link_srv)
+{
+	link_srv->hdmi_frl_disable = dc_link_disable_frl;
+}
+
 static void construct_link_service_dp_trace(struct link_service *link_srv)
 {
 	link_srv->dp_trace_is_initialized = dp_trace_is_initialized;
@@ -298,6 +304,7 @@ static void construct_link_service(struct link_service *link_srv)
 	construct_link_service_dp_panel_replay(link_srv);
 	construct_link_service_dp_cts(link_srv);
 	construct_link_service_dp_trace(link_srv);
+	construct_link_service_hdmi_frl(link_srv);
 }
 
 struct link_service *link_create_link_service(void)