drm/amd/display: Clear optc false state when disable otg

[why]
when disable optc, need to clear the underflow status as well.
Reviewed-by: Chris Park <Chris.Park@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hwseq.c

@@ -339,20 +339,20 @@ void dcn31_enable_power_gating_plane(
 	bool enable)
 {
 	bool force_on = true; /* disable power gating */
+	uint32_t org_ip_request_cntl = 0;
 
 	if (enable && !hws->ctx->dc->debug.disable_hubp_power_gate)
 		force_on = false;
 
+	REG_GET(DC_IP_REQUEST_CNTL, IP_REQUEST_EN, &org_ip_request_cntl);
+	if (org_ip_request_cntl == 0)
+		REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 1);
 	/* DCHUBP0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN0_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN0_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN2_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN2_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	/* DPP0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN1_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN1_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN3_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN3_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 
 	force_on = true; /* disable power gating */
 	if (enable && !hws->ctx->dc->debug.disable_dsc_power_gate)
@@ -360,11 +360,11 @@ void dcn31_enable_power_gating_plane(
 
 	/* DCS0/1/2/3/4/5 */
 	REG_UPDATE(DOMAIN16_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN16_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN17_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN17_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
 	REG_UPDATE(DOMAIN18_PG_CONFIG, DOMAIN_POWER_FORCEON, force_on);
-	REG_WAIT(DOMAIN18_PG_STATUS, DOMAIN_PGFSM_PWR_STATUS, force_on, 1, 1000);
+
+	if (org_ip_request_cntl == 0)
+		REG_SET(DC_IP_REQUEST_CNTL, 0, IP_REQUEST_EN, 0);
 }
 
 void dcn31_update_info_frame(struct pipe_ctx *pipe_ctx)

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_optc.c

@@ -124,7 +124,6 @@ static bool optc31_enable_crtc(struct timing_generator *optc)
 static bool optc31_disable_crtc(struct timing_generator *optc)
 {
 	struct optc *optc1 = DCN10TG_FROM_TG(optc);
-
 	/* disable otg request until end of the first line
 	 * in the vertical blank region
 	 */
@@ -138,6 +137,7 @@ static bool optc31_disable_crtc(struct timing_generator *optc)
 	REG_WAIT(OTG_CLOCK_CONTROL,
 			OTG_BUSY, 0,
 			1, 100000);
+	optc1_clear_optc_underflow(optc);
 
 	return true;
 }
@@ -158,6 +158,9 @@ static bool optc31_immediate_disable_crtc(struct timing_generator *optc)
 			OTG_BUSY, 0,
 			1, 100000);
 
+	/* clear the false state */
+	optc1_clear_optc_underflow(optc);
+
 	return true;
 }