From: Yongqiang Sun <yongqiang.sun@amd.com>
Date: Mon, 23 Oct 2017 15:57:52 -0400
Subject: drm/amd/display: Enalbe blank data double buffer after mpc
 disconnected.
Git-commit: 38614212522d07835050c15eb877b6bd68bcebca
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@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/dcn10/dcn10_timing_generator.c |   19 +++++++---
 drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h      |    2 +
 2 files changed, 16 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.c
@@ -290,6 +290,16 @@ static void tgn10_program_timing(
 
 }
 
+static void tgn10_set_blank_data_double_buffer(struct timing_generator *tg, bool enable)
+{
+	struct dcn10_timing_generator *tgn10 = DCN10TG_FROM_TG(tg);
+
+	uint32_t blank_data_double_buffer_enable = enable ? 1 : 0;
+
+	REG_UPDATE(OTG_DOUBLE_BUFFER_CONTROL,
+			OTG_BLANK_DATA_DOUBLE_BUFFER_EN, blank_data_double_buffer_enable);
+}
+
 /**
  * unblank_crtc
  * Call ASIC Control Object to UnBlank CRTC.
@@ -306,8 +316,7 @@ static void tgn10_unblank_crtc(struct ti
 	 * this check will be removed.
 	 */
 	if (vertical_interrupt_enable)
-		REG_UPDATE(OTG_DOUBLE_BUFFER_CONTROL,
-				OTG_BLANK_DATA_DOUBLE_BUFFER_EN, 1);
+		tgn10_set_blank_data_double_buffer(tg, true);
 
 	REG_UPDATE_2(OTG_BLANK_CONTROL,
 			OTG_BLANK_DATA_EN, 0,
@@ -334,8 +343,7 @@ static void tgn10_blank_crtc(struct timi
 			OTG_BLANK_DATA_EN, 1,
 			1, 100000);
 
-	REG_UPDATE(OTG_DOUBLE_BUFFER_CONTROL,
-			OTG_BLANK_DATA_DOUBLE_BUFFER_EN, 0);
+	tgn10_set_blank_data_double_buffer(tg, false);
 }
 
 static void tgn10_set_blank(struct timing_generator *tg,
@@ -1234,7 +1242,8 @@ static const struct timing_generator_fun
 		.set_static_screen_control = tgn10_set_static_screen_control,
 		.set_test_pattern = tgn10_set_test_pattern,
 		.program_stereo = tgn10_program_stereo,
-		.is_stereo_left_eye = tgn10_is_stereo_left_eye
+		.is_stereo_left_eye = tgn10_is_stereo_left_eye,
+		.set_blank_data_double_buffer = tgn10_set_blank_data_double_buffer
 };
 
 void dcn10_timing_generator_init(struct dcn10_timing_generator *tgn10)
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
@@ -182,6 +182,8 @@ struct timing_generator_funcs {
 	void (*program_stereo)(struct timing_generator *tg,
 		const struct dc_crtc_timing *timing, struct crtc_stereo_flags *flags);
 	bool (*is_stereo_left_eye)(struct timing_generator *tg);
+
+	void (*set_blank_data_double_buffer)(struct timing_generator *tg, bool enable);
 };
 
 #endif