drm/amd/display: make PSR static screen entry within 30 ms

[Why]
With different refresh rate panels, the PSR entry/exit time is
different since it is dependent on 2 frame entry time today

[How]
Make static screen num frame entry time to be calculated
such that entry time is within 30 ms instead of fixed num
frames.
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -8393,17 +8393,37 @@ static bool amdgpu_dm_link_setup_psr(struct dc_stream_state *stream)
 bool amdgpu_dm_psr_enable(struct dc_stream_state *stream)
 {
 	struct dc_link *link = stream->link;
-	struct dc_static_screen_events triggers = {0};
+	unsigned int vsync_rate_hz = 0;
+	struct dc_static_screen_params params = {0};
+	/* Calculate number of static frames before generating interrupt to
+	 * enter PSR.
+	 */
+	unsigned int frame_time_microsec = 1000000 / vsync_rate_hz;
+	// Init fail safe of 2 frames static
+	unsigned int num_frames_static = 2;
 
 	DRM_DEBUG_DRIVER("Enabling psr...\n");
 
-	triggers.cursor_update = true;
-	triggers.overlay_update = true;
-	triggers.surface_update = true;
+	vsync_rate_hz = div64_u64(div64_u64((
+			stream->timing.pix_clk_100hz * 100),
+			stream->timing.v_total),
+			stream->timing.h_total);
+
+	/* Round up
+	 * Calculate number of frames such that at least 30 ms of time has
+	 * passed.
+	 */
+	if (vsync_rate_hz != 0)
+		num_frames_static = (30000 / frame_time_microsec) + 1;
+
+	params.triggers.cursor_update = true;
+	params.triggers.overlay_update = true;
+	params.triggers.surface_update = true;
+	params.num_frames = num_frames_static;
 
-	dc_stream_set_static_screen_events(link->ctx->dc,
+	dc_stream_set_static_screen_params(link->ctx->dc,
 					   &stream, 1,
-					   &triggers);
+					   &params);
 
 	return dc_link_set_psr_allow_active(link, true, false);
 }

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -510,10 +510,10 @@ bool dc_stream_program_csc_matrix(struct dc *dc, struct dc_stream_state *stream)
 	return ret;
 }
 
-void dc_stream_set_static_screen_events(struct dc *dc,
+void dc_stream_set_static_screen_params(struct dc *dc,
 		struct dc_stream_state **streams,
 		int num_streams,
-		const struct dc_static_screen_events *events)
+		const struct dc_static_screen_params *params)
 {
 	int i = 0;
 	int j = 0;
@@ -532,7 +532,7 @@ void dc_stream_set_static_screen_events(struct dc *dc,
 		}
 	}
 
-	dc->hwss.set_static_screen_control(pipes_affected, num_pipes_affected, events);
+	dc->hwss.set_static_screen_control(pipes_affected, num_pipes_affected, params);
 }
 
 static void dc_destruct(struct dc *dc)

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -2542,7 +2542,7 @@ bool dc_link_setup_psr(struct dc_link *link,
 		transmitter_to_phy_id(link->link_enc->transmitter);
 
 	psr_context->crtcTimingVerticalTotal = stream->timing.v_total;
-	psr_context->vsyncRateHz = div64_u64(div64_u64((stream->
+	psr_context->vsync_rate_hz = div64_u64(div64_u64((stream->
 					timing.pix_clk_100hz * 100),
 					stream->timing.v_total),
 					stream->timing.h_total);

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

@@ -157,11 +157,14 @@ struct dc_surface_dcc_cap {
 	bool const_color_support;
 };
 
-struct dc_static_screen_events {
-	bool force_trigger;
-	bool cursor_update;
-	bool surface_update;
-	bool overlay_update;
+struct dc_static_screen_params {
+	struct {
+		bool force_trigger;
+		bool cursor_update;
+		bool surface_update;
+		bool overlay_update;
+	} triggers;
+	unsigned int num_frames;
 };
 
 

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -439,10 +439,10 @@ bool dc_stream_get_crc(struct dc *dc,
 		       uint32_t *g_y,
 		       uint32_t *b_cb);
 
-void dc_stream_set_static_screen_events(struct dc *dc,
+void dc_stream_set_static_screen_params(struct dc *dc,
 					struct dc_stream_state **stream,
 					int num_streams,
-					const struct dc_static_screen_events *events);
+					const struct dc_static_screen_params *params);
 
 void dc_stream_set_dyn_expansion(struct dc *dc, struct dc_stream_state *stream,
 		enum dc_dynamic_expansion option);

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -729,7 +729,7 @@ struct psr_context {
 	/* The VSync rate in Hz used to calculate the
 	 * step size for smooth brightness feature
 	 */
-	unsigned int vsyncRateHz;
+	unsigned int vsync_rate_hz;
 	unsigned int skipPsrWaitForPllLock;
 	unsigned int numberOfControllers;
 	/* Unused, for future use. To indicate that first changed frame from

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

@@ -1373,9 +1373,13 @@ static enum dc_status apply_single_controller_ctx_to_hw(
 	// DRR should set trigger event to monitor surface update event
 	if (stream->adjust.v_total_min != 0 && stream->adjust.v_total_max != 0)
 		event_triggers = 0x80;
+	/* Event triggers and num frames initialized for DRR, but can be
+	 * later updated for PSR use. Note DRR trigger events are generated
+	 * regardless of whether num frames met.
+	 */
 	if (pipe_ctx->stream_res.tg->funcs->set_static_screen_control)
 		pipe_ctx->stream_res.tg->funcs->set_static_screen_control(
-				pipe_ctx->stream_res.tg, event_triggers);
+				pipe_ctx->stream_res.tg, event_triggers, 2);
 
 	if (!dc_is_virtual_signal(pipe_ctx->stream->signal))
 		pipe_ctx->stream_res.stream_enc->funcs->dig_connect_to_otg(
@@ -1706,6 +1710,8 @@ static void set_drr(struct pipe_ctx **pipe_ctx,
 	struct drr_params params = {0};
 	// DRR should set trigger event to monitor surface update event
 	unsigned int event_triggers = 0x80;
+	// Note DRR trigger events are generated regardless of whether num frames met.
+	unsigned int num_frames = 2;
 
 	params.vertical_total_max = vmax;
 	params.vertical_total_min = vmin;
@@ -1721,7 +1727,7 @@ static void set_drr(struct pipe_ctx **pipe_ctx,
 		if (vmax != 0 && vmin != 0)
 			pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control(
 					pipe_ctx[i]->stream_res.tg,
-					event_triggers);
+					event_triggers, num_frames);
 	}
 }
 
@@ -1738,30 +1744,31 @@ static void get_position(struct pipe_ctx **pipe_ctx,
 }
 
 static void set_static_screen_control(struct pipe_ctx **pipe_ctx,
-		int num_pipes, const struct dc_static_screen_events *events)
+		int num_pipes, const struct dc_static_screen_params *params)
 {
 	unsigned int i;
-	unsigned int value = 0;
+	unsigned int triggers = 0;
 
-	if (events->overlay_update)
-		value |= 0x100;
-	if (events->surface_update)
-		value |= 0x80;
-	if (events->cursor_update)
-		value |= 0x2;
-	if (events->force_trigger)
-		value |= 0x1;
+	if (params->triggers.overlay_update)
+		triggers |= 0x100;
+	if (params->triggers.surface_update)
+		triggers |= 0x80;
+	if (params->triggers.cursor_update)
+		triggers |= 0x2;
+	if (params->triggers.force_trigger)
+		triggers |= 0x1;
 
 	if (num_pipes) {
 		struct dc *dc = pipe_ctx[0]->stream->ctx->dc;
 
 		if (dc->fbc_compressor)
-			value |= 0x84;
+			triggers |= 0x84;
 	}
 
 	for (i = 0; i < num_pipes; i++)
 		pipe_ctx[i]->stream_res.tg->funcs->
-			set_static_screen_control(pipe_ctx[i]->stream_res.tg, value);
+			set_static_screen_control(pipe_ctx[i]->stream_res.tg,
+					triggers, params->num_frames);
 }
 
 /*

drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c

@@ -469,22 +469,27 @@ void dce110_timing_generator_set_drr(
 
 void dce110_timing_generator_set_static_screen_control(
 	struct timing_generator *tg,
-	uint32_t value)
+	uint32_t event_triggers,
+	uint32_t num_frames)
 {
 	struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
 	uint32_t static_screen_cntl = 0;
 	uint32_t addr = 0;
 
+	// By register spec, it only takes 8 bit value
+	if (num_frames > 0xFF)
+		num_frames = 0xFF;
+
 	addr = CRTC_REG(mmCRTC_STATIC_SCREEN_CONTROL);
 	static_screen_cntl = dm_read_reg(tg->ctx, addr);
 
 	set_reg_field_value(static_screen_cntl,
-				value,
+				event_triggers,
 				CRTC_STATIC_SCREEN_CONTROL,
 				CRTC_STATIC_SCREEN_EVENT_MASK);
 
 	set_reg_field_value(static_screen_cntl,
-				2,
+				num_frames,
 				CRTC_STATIC_SCREEN_CONTROL,
 				CRTC_STATIC_SCREEN_FRAME_COUNT);
 

drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.h

@@ -231,7 +231,8 @@ void dce110_timing_generator_set_drr(
 
 void dce110_timing_generator_set_static_screen_control(
 	struct timing_generator *tg,
-	uint32_t value);
+	uint32_t event_triggers,
+	uint32_t num_frames);
 
 void dce110_timing_generator_get_crtc_scanoutpos(
 	struct timing_generator *tg,

drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c

@@ -819,13 +819,18 @@ void dce120_tg_set_colors(struct timing_generator *tg,
 
 static void dce120_timing_generator_set_static_screen_control(
 	struct timing_generator *tg,
-	uint32_t value)
+	uint32_t event_triggers,
+	uint32_t num_frames)
 {
 	struct dce110_timing_generator *tg110 = DCE110TG_FROM_TG(tg);
 
+	// By register spec, it only takes 8 bit value
+	if (num_frames > 0xFF)
+		num_frames = 0xFF;
+
 	CRTC_REG_UPDATE_2(CRTC0_CRTC_STATIC_SCREEN_CONTROL,
-			CRTC_STATIC_SCREEN_EVENT_MASK, value,
-			CRTC_STATIC_SCREEN_FRAME_COUNT, 2);
+			CRTC_STATIC_SCREEN_EVENT_MASK, event_triggers,
+			CRTC_STATIC_SCREEN_FRAME_COUNT, num_frames);
 }
 
 void dce120_timing_generator_set_test_pattern(

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -2704,6 +2704,8 @@ void dcn10_set_drr(struct pipe_ctx **pipe_ctx,
 	struct drr_params params = {0};
 	// DRR set trigger event mapped to OTG_TRIG_A (bit 11) for manual control flow
 	unsigned int event_triggers = 0x800;
+	// Note DRR trigger events are generated regardless of whether num frames met.
+	unsigned int num_frames = 2;
 
 	params.vertical_total_max = vmax;
 	params.vertical_total_min = vmin;
@@ -2720,7 +2722,7 @@ void dcn10_set_drr(struct pipe_ctx **pipe_ctx,
 		if (vmax != 0 && vmin != 0)
 			pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control(
 					pipe_ctx[i]->stream_res.tg,
-					event_triggers);
+					event_triggers, num_frames);
 	}
 }
 
@@ -2737,21 +2739,22 @@ void dcn10_get_position(struct pipe_ctx **pipe_ctx,
 }
 
 void dcn10_set_static_screen_control(struct pipe_ctx **pipe_ctx,
-		int num_pipes, const struct dc_static_screen_events *events)
+		int num_pipes, const struct dc_static_screen_params *params)
 {
 	unsigned int i;
-	unsigned int value = 0;
+	unsigned int triggers = 0;
 
-	if (events->surface_update)
-		value |= 0x80;
-	if (events->cursor_update)
-		value |= 0x2;
-	if (events->force_trigger)
-		value |= 0x1;
+	if (params->triggers.surface_update)
+		triggers |= 0x80;
+	if (params->triggers.cursor_update)
+		triggers |= 0x2;
+	if (params->triggers.force_trigger)
+		triggers |= 0x1;
 
 	for (i = 0; i < num_pipes; i++)
 		pipe_ctx[i]->stream_res.tg->funcs->
-			set_static_screen_control(pipe_ctx[i]->stream_res.tg, value);
+			set_static_screen_control(pipe_ctx[i]->stream_res.tg,
+					triggers, params->num_frames);
 }
 
 static void dcn10_config_stereo_parameters(

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.h

@@ -132,7 +132,7 @@ void dcn10_get_position(struct pipe_ctx **pipe_ctx,
 		int num_pipes,
 		struct crtc_position *position);
 void dcn10_set_static_screen_control(struct pipe_ctx **pipe_ctx,
-		int num_pipes, const struct dc_static_screen_events *events);
+		int num_pipes, const struct dc_static_screen_params *params);
 void dcn10_setup_stereo(struct pipe_ctx *pipe_ctx, struct dc *dc);
 void dce110_set_avmute(struct pipe_ctx *pipe_ctx, bool enable);
 void dcn10_log_hw_state(struct dc *dc,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c

@@ -789,21 +789,26 @@ void optc1_set_early_control(
 
 void optc1_set_static_screen_control(
 	struct timing_generator *optc,
-	uint32_t value)
+	uint32_t event_triggers,
+	uint32_t num_frames)
 {
 	struct optc *optc1 = DCN10TG_FROM_TG(optc);
 
+	// By register spec, it only takes 8 bit value
+	if (num_frames > 0xFF)
+		num_frames = 0xFF;
+
 	/* Bit 8 is no longer applicable in RV for PSR case,
 	 * set bit 8 to 0 if given
 	 */
-	if ((value & STATIC_SCREEN_EVENT_MASK_RANGETIMING_DOUBLE_BUFFER_UPDATE_EN)
+	if ((event_triggers & STATIC_SCREEN_EVENT_MASK_RANGETIMING_DOUBLE_BUFFER_UPDATE_EN)
 			!= 0)
-		value = value &
+		event_triggers = event_triggers &
 		~STATIC_SCREEN_EVENT_MASK_RANGETIMING_DOUBLE_BUFFER_UPDATE_EN;
 
 	REG_SET_2(OTG_STATIC_SCREEN_CONTROL, 0,
-			OTG_STATIC_SCREEN_EVENT_MASK, value,
-			OTG_STATIC_SCREEN_FRAME_COUNT, 2);
+			OTG_STATIC_SCREEN_EVENT_MASK, event_triggers,
+			OTG_STATIC_SCREEN_FRAME_COUNT, num_frames);
 }
 
 void optc1_setup_manual_trigger(struct timing_generator *optc)

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h

@@ -625,7 +625,8 @@ void optc1_set_drr(
 
 void optc1_set_static_screen_control(
 	struct timing_generator *optc,
-	uint32_t value);
+	uint32_t event_triggers,
+	uint32_t num_frames);
 
 void optc1_program_stereo(struct timing_generator *optc,
 	const struct dc_crtc_timing *timing, struct crtc_stereo_flags *flags);

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -686,9 +686,13 @@ enum dc_status dcn20_enable_stream_timing(
 	// DRR should set trigger event to monitor surface update event
 	if (stream->adjust.v_total_min != 0 && stream->adjust.v_total_max != 0)
 		event_triggers = 0x80;
+	/* Event triggers and num frames initialized for DRR, but can be
+	 * later updated for PSR use. Note DRR trigger events are generated
+	 * regardless of whether num frames met.
+	 */
 	if (pipe_ctx->stream_res.tg->funcs->set_static_screen_control)
 		pipe_ctx->stream_res.tg->funcs->set_static_screen_control(
-				pipe_ctx->stream_res.tg, event_triggers);
+				pipe_ctx->stream_res.tg, event_triggers, 2);
 
 	/* TODO program crtc source select for non-virtual signal*/
 	/* TODO program FMT */

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

@@ -208,7 +208,8 @@ struct timing_generator_funcs {
 					bool enable, const struct dc_crtc_timing *timing);
 	void (*set_drr)(struct timing_generator *tg, const struct drr_params *params);
 	void (*set_static_screen_control)(struct timing_generator *tg,
-							uint32_t value);
+						uint32_t event_triggers,
+						uint32_t num_frames);
 	void (*set_test_pattern)(
 		struct timing_generator *tg,
 		enum controller_dp_test_pattern test_pattern,

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

@@ -42,7 +42,7 @@ struct dc_state;
 struct dc_stream_status;
 struct dc_writeback_info;
 struct dchub_init_data;
-struct dc_static_screen_events;
+struct dc_static_screen_params;
 struct resource_pool;
 struct dc_phy_addr_space_config;
 struct dc_virtual_addr_space_config;
@@ -102,7 +102,7 @@ struct hw_sequencer_funcs {
 			unsigned int vmid, unsigned int vmid_frame_number);
 	void (*set_static_screen_control)(struct pipe_ctx **pipe_ctx,
 			int num_pipes,
-			const struct dc_static_screen_events *events);
+			const struct dc_static_screen_params *events);
 
 	/* Stream Related */
 	void (*enable_stream)(struct pipe_ctx *pipe_ctx);

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

@@ -51,7 +51,7 @@ struct dc_state;
 struct dc_stream_status;
 struct dc_writeback_info;
 struct dchub_init_data;
-struct dc_static_screen_events;
+struct dc_static_screen_params;
 struct resource_pool;
 struct resource_context;
 struct stream_resource;