drm/amd/display: Raise DPG height during timing synchronization

[Why]
Underflow counter increases in AGM when performing some mode switches due
to timing sync, which is a known hardware issue.

[How]
Temporarily raise DPG height during timing sync so that underflow is not
reported.
Signed-off-by: Taimur Hassan <syed.hassan@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1847,10 +1847,20 @@ void dcn10_enable_timing_synchronization(
 	struct pipe_ctx *grouped_pipes[])
 {
 	struct dc_context *dc_ctx = dc->ctx;
-	int i;
+	struct output_pixel_processor *opp;
+	struct timing_generator *tg;
+	int i, width, height;
 
 	DC_SYNC_INFO("Setting up OTG reset trigger\n");
 
+	for (i = 1; i < group_size; i++) {
+		opp = grouped_pipes[i]->stream_res.opp;
+		tg = grouped_pipes[i]->stream_res.tg;
+		tg->funcs->get_otg_active_size(tg, &width, &height);
+		if (opp->funcs->opp_program_dpg_dimensions)
+			opp->funcs->opp_program_dpg_dimensions(opp, width, 2*(height) + 1);
+	}
+
 	for (i = 1; i < group_size; i++)
 		grouped_pipes[i]->stream_res.tg->funcs->enable_reset_trigger(
 				grouped_pipes[i]->stream_res.tg,
@@ -1867,6 +1877,14 @@ void dcn10_enable_timing_synchronization(
 		grouped_pipes[i]->stream_res.tg->funcs->disable_reset_trigger(
 				grouped_pipes[i]->stream_res.tg);
 
+	for (i = 1; i < group_size; i++) {
+		opp = grouped_pipes[i]->stream_res.opp;
+		tg = grouped_pipes[i]->stream_res.tg;
+		tg->funcs->get_otg_active_size(tg, &width, &height);
+		if (opp->funcs->opp_program_dpg_dimensions)
+			opp->funcs->opp_program_dpg_dimensions(opp, width, height);
+	}
+
 	DC_SYNC_INFO("Sync complete\n");
 }
 

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c

@@ -403,6 +403,7 @@ static const struct opp_funcs dcn10_opp_funcs = {
 		.opp_program_stereo = opp1_program_stereo,
 		.opp_pipe_clock_control = opp1_pipe_clock_control,
 		.opp_set_disp_pattern_generator = NULL,
+		.opp_program_dpg_dimensions = NULL,
 		.dpg_is_blanked = NULL,
 		.opp_destroy = opp1_destroy
 };

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_opp.c

@@ -290,6 +290,17 @@ void opp2_set_disp_pattern_generator(
 	}
 }
 
+void opp2_program_dpg_dimensions(
+		struct output_pixel_processor *opp,
+		int width, int height)
+{
+	struct dcn20_opp *oppn20 = TO_DCN20_OPP(opp);
+
+	REG_SET_2(DPG_DIMENSIONS, 0,
+		DPG_ACTIVE_WIDTH, width,
+		DPG_ACTIVE_HEIGHT, height);
+}
+
 void opp2_dpg_set_blank_color(
 		struct output_pixel_processor *opp,
 		const struct tg_color *color)
@@ -350,6 +361,7 @@ static struct opp_funcs dcn20_opp_funcs = {
 		.opp_program_stereo = opp1_program_stereo,
 		.opp_pipe_clock_control = opp1_pipe_clock_control,
 		.opp_set_disp_pattern_generator = opp2_set_disp_pattern_generator,
+		.opp_program_dpg_dimensions = opp2_program_dpg_dimensions,
 		.dpg_is_blanked = opp2_dpg_is_blanked,
 		.opp_dpg_set_blank_color = opp2_dpg_set_blank_color,
 		.opp_destroy = opp1_destroy,

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_opp.h

@@ -153,6 +153,10 @@ void opp2_set_disp_pattern_generator(
 	int height,
 	int offset);
 
+void opp2_program_dpg_dimensions(
+		struct output_pixel_processor *opp,
+		int width, int height);
+
 bool opp2_dpg_is_blanked(struct output_pixel_processor *opp);
 
 void opp2_dpg_set_blank_color(

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

@@ -313,6 +313,11 @@ struct opp_funcs {
 			int height,
 			int offset);
 
+	void (*opp_program_dpg_dimensions)(
+				struct output_pixel_processor *opp,
+				int width,
+				int height);
+
 	bool (*dpg_is_blanked)(
 			struct output_pixel_processor *opp);