From: Tony Cheng <tony.cheng@amd.com>
Date: Fri, 23 Dec 2016 07:12:19 -0500
Subject: drm/amd/display: debug opt disable hdmi deep color
Git-commit: dc0bcaf2cafaa7a6023055d13ebf7dcc8c6e00b5
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                   |    1 +
 drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c |    3 +++
 2 files changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -147,6 +147,7 @@ struct dc_debug {
 	bool disable_power_gate;
 	bool disable_clock_gate;
 	bool disable_dmcu;
+	bool disable_hdmi_deep_color;
 };
 
 struct dc {
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -993,6 +993,9 @@ bool dce110_link_encoder_construct(
 	enc110->base.features.max_deep_color = COLOR_DEPTH_121212;
 	enc110->base.features.max_hdmi_deep_color = COLOR_DEPTH_121212;
 
+	if (enc110->base.ctx->dc->debug.disable_hdmi_deep_color)
+		enc110->base.features.max_hdmi_deep_color = COLOR_DEPTH_888;
+
 	/* set the flag to indicate whether driver poll the I2C data pin
 	 * while doing the DP sink detect
 	 */