drm/amd/display: Add VC for VESA Aux Backlight Control

[WHY]
There is no way to distinguish
the static backlight control type
being used and the VABC support
without the use of a debugger or
reading DPCD registers.

[HOW]
Add Visual Confirm support
for VESA Aux-based Backlight Control.

Reviewed-by: Harry Vanzylldejong <harry.vanzylldejong@amd.com>
Signed-off-by: Iswara Nagulendran <Iswara.Nagulendran@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

4 files changed, 44 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 08d35d9da443..76c36374de67 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1236,6 +1236,8 @@ static void dc_update_visual_confirm_color(struct dc *dc, struct dc_state *conte
 				get_mclk_switch_visual_confirm_color(pipe_ctx, &(pipe_ctx->visual_confirm_color));
 			else if (dc->debug.visual_confirm == VISUAL_CONFIRM_FAMS2)
 				get_fams2_visual_confirm_color(dc, context, pipe_ctx, &(pipe_ctx->visual_confirm_color));
+			else if (dc->debug.visual_confirm == VISUAL_CONFIRM_VABC)
+				get_vabc_visual_confirm_color(pipe_ctx, &(pipe_ctx->visual_confirm_color));
 		}
 	}
 }
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
index 252af83e34a5..6eb9bae3af91 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_hw_sequencer.c
@@ -425,6 +425,44 @@ void get_hdr_visual_confirm_color(
 	}
 }
 
+/* Visual Confirm color definition for VABC */
+void get_vabc_visual_confirm_color(
+	struct pipe_ctx *pipe_ctx,
+	struct tg_color *color)
+{
+	uint32_t color_value = MAX_TG_COLOR_VALUE;
+	struct dc_link *edp_link = NULL;
+
+	if (pipe_ctx && pipe_ctx->stream && pipe_ctx->stream->link) {
+		if (pipe_ctx->stream->link->connector_signal == SIGNAL_TYPE_EDP)
+			edp_link = pipe_ctx->stream->link;
+	}
+
+	if (edp_link) {
+		switch (edp_link->backlight_control_type) {
+		case BACKLIGHT_CONTROL_PWM:
+			color->color_r_cr = color_value;
+			color->color_g_y = 0;
+			color->color_b_cb = 0;
+			break;
+		case BACKLIGHT_CONTROL_AMD_AUX:
+			color->color_r_cr = 0;
+			color->color_g_y = color_value;
+			color->color_b_cb = 0;
+			break;
+		case BACKLIGHT_CONTROL_VESA_AUX:
+			color->color_r_cr = 0;
+			color->color_g_y = 0;
+			color->color_b_cb = color_value;
+			break;
+		}
+	} else {
+		color->color_r_cr = 0;
+		color->color_g_y = 0;
+		color->color_b_cb = 0;
+	}
+}
+
 void get_subvp_visual_confirm_color(
 		struct pipe_ctx *pipe_ctx,
 		struct tg_color *color)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 2e4200d5145f..5b32c447da98 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -489,6 +489,7 @@ enum visual_confirm {
 	VISUAL_CONFIRM_MCLK_SWITCH = 16,
 	VISUAL_CONFIRM_FAMS2 = 19,
 	VISUAL_CONFIRM_HW_CURSOR = 20,
+	VISUAL_CONFIRM_VABC = 21,
 };
 
 enum dc_psr_power_opts {
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
index a5bb10d7b160..98d85c7ab3fa 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
+++ b/drivers/gpu/drm/amd/display/dc/hwss/hw_sequencer.h
@@ -194,7 +194,6 @@ enum block_sequence_func {
 	DMUB_SUBVP_SAVE_SURF_ADDR,
 	HUBP_WAIT_FOR_DCC_META_PROP,
 	DMUB_FAMS2_GLOBAL_CONTROL_LOCK_FAST,
-
 };
 
 struct block_sequence {
@@ -485,11 +484,12 @@ void get_hdr_visual_confirm_color(
 void get_mpctree_visual_confirm_color(
 		struct pipe_ctx *pipe_ctx,
 		struct tg_color *color);
-
+void get_vabc_visual_confirm_color(
+	struct pipe_ctx *pipe_ctx,
+	struct tg_color *color);
 void get_subvp_visual_confirm_color(
 	struct pipe_ctx *pipe_ctx,
 	struct tg_color *color);
-
 void get_fams2_visual_confirm_color(
 	struct dc *dc,
 	struct dc_state *context,