drm/amd/display: add HDR visual confirm

[Why]
Testing team wants a way to tell if HDR is on or not

[How]
Program the overscan color to visually indicate the HDR state of the top-most plane
Signed-off-by: Gloria Li <geling.li@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/dc.h

@@ -169,6 +169,12 @@ struct dc_config {
 	bool disable_disp_pll_sharing;
 };
 
+enum visual_confirm {
+	VISUAL_CONFIRM_DISABLE = 0,
+	VISUAL_CONFIRM_SURFACE = 1,
+	VISUAL_CONFIRM_HDR = 2,
+};
+
 enum dcc_option {
 	DCC_ENABLE = 0,
 	DCC_DISABLE = 1,
@@ -202,7 +208,7 @@ struct dc_clocks {
 };
 
 struct dc_debug {
-	bool surface_visual_confirm;
+	enum visual_confirm visual_confirm;
 	bool sanity_checks;
 	bool max_disp_clk;
 	bool surface_trace;
@@ -387,7 +393,8 @@ enum dc_transfer_func_predefined {
 	TRANSFER_FUNCTION_LINEAR,
 	TRANSFER_FUNCTION_UNITY,
 	TRANSFER_FUNCTION_HLG,
-	TRANSFER_FUNCTION_HLG12
+	TRANSFER_FUNCTION_HLG12,
+	TRANSFER_FUNCTION_GAMMA22
 };
 
 struct dc_transfer_func {

drivers/gpu/drm/amd/display/dc/dce/dce_transform.c

@@ -155,7 +155,7 @@ static void program_overscan(
 	int overscan_bottom = data->v_active
 			- data->recout.y - data->recout.height;
 
-	if (xfm_dce->base.ctx->dc->debug.surface_visual_confirm) {
+	if (xfm_dce->base.ctx->dc->debug.visual_confirm != VISUAL_CONFIRM_DISABLE) {
 		overscan_bottom += 2;
 		overscan_right += 2;
 	}

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

@@ -1256,7 +1256,7 @@ static void program_scaler(const struct dc *dc,
 		return;
 #endif
 
-	if (dc->debug.surface_visual_confirm)
+	if (dc->debug.visual_confirm == VISUAL_CONFIRM_SURFACE)
 		get_surface_visual_confirm_color(pipe_ctx, &color);
 	else
 		color_space_to_black_color(dc,

drivers/gpu/drm/amd/display/dc/dce110/dce110_transform_v.c

@@ -235,7 +235,7 @@ static void program_overscan(
 	int overscan_right = data->h_active - data->recout.x - data->recout.width;
 	int overscan_bottom = data->v_active - data->recout.y - data->recout.height;
 
-	if (xfm_dce->base.ctx->dc->debug.surface_visual_confirm) {
+	if (xfm_dce->base.ctx->dc->debug.visual_confirm != VISUAL_CONFIRM_DISABLE) {
 		overscan_bottom += 2;
 		overscan_right += 2;
 	}

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_dpp_dscl.c

@@ -621,6 +621,10 @@ static void dpp1_dscl_set_manual_ratio_init(
 static void dpp1_dscl_set_recout(
 			struct dcn10_dpp *dpp, const struct rect *recout)
 {
+	int visual_confirm_on = 0;
+	if (dpp->base.ctx->dc->debug.visual_confirm != VISUAL_CONFIRM_DISABLE)
+		visual_confirm_on = 1;
+
 	REG_SET_2(RECOUT_START, 0,
 		/* First pixel of RECOUT */
 			 RECOUT_START_X, recout->x,
@@ -632,8 +636,7 @@ static void dpp1_dscl_set_recout(
 			 RECOUT_WIDTH, recout->width,
 		/* Number of RECOUT vertical lines */
 			 RECOUT_HEIGHT, recout->height
-			 - dpp->base.ctx->dc->debug.surface_visual_confirm * 4 *
-			 (dpp->base.inst + 1));
+			 - visual_confirm_on * 4 * (dpp->base.inst + 1));
 }
 
 /* Main function to program scaler and line buffer in manual scaling mode */

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

@@ -1768,6 +1768,43 @@ static void dcn10_get_surface_visual_confirm_color(
 	}
 }
 
+static void dcn10_get_hdr_visual_confirm_color(
+		struct pipe_ctx *pipe_ctx,
+		struct tg_color *color)
+{
+	uint32_t color_value = MAX_TG_COLOR_VALUE;
+
+	// Determine the overscan color based on the top-most (desktop) plane's context
+	struct pipe_ctx *top_pipe_ctx  = pipe_ctx;
+
+	while (top_pipe_ctx->top_pipe != NULL)
+		top_pipe_ctx = top_pipe_ctx->top_pipe;
+
+	switch (top_pipe_ctx->plane_res.scl_data.format) {
+	case PIXEL_FORMAT_ARGB2101010:
+		if (top_pipe_ctx->stream->out_transfer_func->tf == TRANSFER_FUNCTION_UNITY) {
+			/* HDR10, ARGB2101010 - set boarder color to red */
+			color->color_r_cr = color_value;
+		}
+		break;
+	case PIXEL_FORMAT_FP16:
+		if (top_pipe_ctx->stream->out_transfer_func->tf == TRANSFER_FUNCTION_PQ) {
+			/* HDR10, FP16 - set boarder color to blue */
+			color->color_b_cb = color_value;
+		} else if (top_pipe_ctx->stream->out_transfer_func->tf == TRANSFER_FUNCTION_GAMMA22) {
+			/* FreeSync 2 HDR - set boarder color to green */
+			color->color_g_y = color_value;
+		}
+		break;
+	default:
+		/* SDR - set boarder color to Gray */
+		color->color_r_cr = color_value/2;
+		color->color_b_cb = color_value/2;
+		color->color_g_y = color_value/2;
+		break;
+	}
+}
+
 static uint16_t fixed_point_to_int_frac(
 	struct fixed31_32 arg,
 	uint8_t integer_bits,
@@ -1862,13 +1899,17 @@ static void dcn10_update_mpcc(struct dc *dc, struct pipe_ctx *pipe_ctx)
 
 	/* TODO: proper fix once fpga works */
 
-	if (dc->debug.surface_visual_confirm)
+	if (dc->debug.visual_confirm == VISUAL_CONFIRM_HDR) {
+		dcn10_get_hdr_visual_confirm_color(
+				pipe_ctx, &blnd_cfg.black_color);
+	} else if (dc->debug.visual_confirm == VISUAL_CONFIRM_SURFACE) {
 		dcn10_get_surface_visual_confirm_color(
 				pipe_ctx, &blnd_cfg.black_color);
-	else
+	} else {
 		color_space_to_black_color(
-			dc, pipe_ctx->stream->output_color_space,
-			&blnd_cfg.black_color);
+				dc, pipe_ctx->stream->output_color_space,
+				&blnd_cfg.black_color);
+	}
 
 	if (per_pixel_alpha)
 		blnd_cfg.alpha_mode = MPCC_ALPHA_BLEND_MODE_PER_PIXEL_ALPHA;
@@ -2148,6 +2189,7 @@ static void program_all_pipe_in_tree(
 				pipe_ctx->stream_res.tg);
 
 		dc->hwss.blank_pixel_data(dc, pipe_ctx, blank);
+
 	}
 
 	if (pipe_ctx->plane_state != NULL) {