drm/amd/display: Ensure DRR triggers in BP

[Why]
In the previous implementation DRR event sometimes came
in during FP2 region which is a keep-out zone. This
would cause the frame not to latch until the next frame
which resulted in heavy flicker. To fix this we need
to make sure that it triggers in the BP.

[How]
1. Remove DRR programming during flip
2. Setup manual trigger for DRR event and trigger it
after surface programming is complete
Signed-off-by: Eryk Brol <eryk.brol@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.c

@@ -381,6 +381,35 @@ void optc2_lock(struct timing_generator *optc)
 				1, 10);
 }
 
+void optc2_setup_manual_trigger(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_SET(OTG_MANUAL_FLOW_CONTROL, 0,
+			MANUAL_FLOW_CONTROL, 1);
+
+	REG_SET(OTG_GLOBAL_CONTROL2, 0,
+			MANUAL_FLOW_CONTROL_SEL, optc->inst);
+
+	REG_SET_8(OTG_TRIGA_CNTL, 0,
+			OTG_TRIGA_SOURCE_SELECT, 22,
+			OTG_TRIGA_SOURCE_PIPE_SELECT, optc->inst,
+			OTG_TRIGA_RISING_EDGE_DETECT_CNTL, 1,
+			OTG_TRIGA_FALLING_EDGE_DETECT_CNTL, 0,
+			OTG_TRIGA_POLARITY_SELECT, 0,
+			OTG_TRIGA_FREQUENCY_SELECT, 0,
+			OTG_TRIGA_DELAY, 0,
+			OTG_TRIGA_CLEAR, 1);
+}
+
+void optc2_program_manual_trigger(struct timing_generator *optc)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_SET(OTG_TRIGA_MANUAL_TRIG, 0,
+			OTG_TRIGA_MANUAL_TRIG, 1);
+}
+
 static struct timing_generator_funcs dcn20_tg_funcs = {
 		.validate_timing = optc1_validate_timing,
 		.program_timing = optc1_program_timing,
@@ -435,6 +464,8 @@ static struct timing_generator_funcs dcn20_tg_funcs = {
 		.set_gsl = optc2_set_gsl,
 		.set_gsl_source_select = optc2_set_gsl_source_select,
 		.set_vtg_params = optc1_set_vtg_params,
+		.program_manual_trigger = optc2_program_manual_trigger,
+		.setup_manual_trigger = optc2_setup_manual_trigger
 };
 
 void dcn20_timing_generator_init(struct optc *optc1)

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.h

@@ -40,7 +40,8 @@
 	SRI(OPTC_BYTES_PER_PIXEL, ODM, inst),\
 	SRI(OPTC_WIDTH_CONTROL, ODM, inst),\
 	SRI(OPTC_MEMORY_CONFIG, ODM, inst),\
-	SR(DWB_SOURCE_SELECT)
+	SR(DWB_SOURCE_SELECT),\
+	SRI(OTG_MANUAL_FLOW_CONTROL, OTG, inst)
 
 #define TG_COMMON_MASK_SH_LIST_DCN2_0(mask_sh)\
 	TG_COMMON_MASK_SH_LIST_DCN(mask_sh),\
@@ -70,7 +71,8 @@
 	SF(ODM0_OPTC_WIDTH_CONTROL, OPTC_DSC_SLICE_WIDTH, mask_sh),\
 	SF(ODM0_OPTC_WIDTH_CONTROL, OPTC_SEGMENT_WIDTH, mask_sh),\
 	SF(DWB_SOURCE_SELECT, OPTC_DWB0_SOURCE_SELECT, mask_sh),\
-	SF(DWB_SOURCE_SELECT, OPTC_DWB1_SOURCE_SELECT, mask_sh)
+	SF(DWB_SOURCE_SELECT, OPTC_DWB1_SOURCE_SELECT, mask_sh),\
+	SF(OTG0_OTG_MANUAL_FLOW_CONTROL, MANUAL_FLOW_CONTROL, mask_sh)
 
 void dcn20_timing_generator_init(struct optc *optc);
 
@@ -105,5 +107,6 @@ void optc2_triplebuffer_unlock(struct timing_generator *optc);
 void optc2_lock(struct timing_generator *optc);
 void optc2_lock_global(struct timing_generator *optc);
 void optc2_setup_global_lock(struct timing_generator *optc);
+void optc2_program_manual_trigger(struct timing_generator *optc);
 
 #endif /* __DC_OPTC_DCN20_H__ */

drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h

@@ -257,6 +257,7 @@ struct timing_generator_funcs {
 
 	void (*set_vtg_params)(struct timing_generator *optc,
 			const struct dc_crtc_timing *dc_crtc_timing);
+
 #ifdef CONFIG_DRM_AMD_DC_DCN2_0
 #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
 	void (*set_dsc_config)(struct timing_generator *optc,