drm/amd/display: Enable double buffer as per vertical interrupt enabled.

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>

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.c

@@ -299,6 +299,17 @@ static void tgn10_program_timing(
 static void tgn10_unblank_crtc(struct timing_generator *tg)
 {
 	struct dcn10_timing_generator *tgn10 = DCN10TG_FROM_TG(tg);
+	uint32_t vertical_interrupt_enable = 0;
+
+	REG_GET(OTG_VERTICAL_INTERRUPT2_CONTROL,
+			OTG_VERTICAL_INTERRUPT2_INT_ENABLE, &vertical_interrupt_enable);
+
+	/* temporary work around for vertical interrupt, once vertical interrupt enabled,
+	 * this check will be removed.
+	 */
+	if (vertical_interrupt_enable)
+		REG_UPDATE(OTG_DOUBLE_BUFFER_CONTROL,
+				OTG_BLANK_DATA_DOUBLE_BUFFER_EN, 1);
 
 	REG_UPDATE_2(OTG_BLANK_CONTROL,
 			OTG_BLANK_DATA_EN, 0,

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_timing_generator.h

@@ -65,6 +65,7 @@
 	SRI(OTG_NOM_VERT_POSITION, OTG, inst),\
 	SRI(OTG_BLACK_COLOR, OTG, inst),\
 	SRI(OTG_CLOCK_CONTROL, OTG, inst),\
+	SRI(OTG_VERTICAL_INTERRUPT2_CONTROL, OTG, inst),\
 	SRI(OTG_VERTICAL_INTERRUPT2_POSITION, OTG, inst),\
 	SRI(OPTC_INPUT_CLOCK_CONTROL, ODM, inst),\
 	SRI(OPTC_DATA_SOURCE_SELECT, ODM, inst),\
@@ -117,6 +118,7 @@ struct dcn_tg_registers {
 	uint32_t OTG_TEST_PATTERN_CONTROL;
 	uint32_t OTG_TEST_PATTERN_COLOR;
 	uint32_t OTG_CLOCK_CONTROL;
+	uint32_t OTG_VERTICAL_INTERRUPT2_CONTROL;
 	uint32_t OTG_VERTICAL_INTERRUPT2_POSITION;
 	uint32_t OPTC_INPUT_CLOCK_CONTROL;
 	uint32_t OPTC_DATA_SOURCE_SELECT;
@@ -196,6 +198,7 @@ struct dcn_tg_registers {
 	SF(OTG0_OTG_CLOCK_CONTROL, OTG_CLOCK_EN, mask_sh),\
 	SF(OTG0_OTG_CLOCK_CONTROL, OTG_CLOCK_ON, mask_sh),\
 	SF(OTG0_OTG_CLOCK_CONTROL, OTG_CLOCK_GATE_DIS, mask_sh),\
+	SF(OTG0_OTG_VERTICAL_INTERRUPT2_CONTROL, OTG_VERTICAL_INTERRUPT2_INT_ENABLE, mask_sh),\
 	SF(OTG0_OTG_VERTICAL_INTERRUPT2_POSITION, OTG_VERTICAL_INTERRUPT2_LINE_START, mask_sh),\
 	SF(ODM0_OPTC_INPUT_CLOCK_CONTROL, OPTC_INPUT_CLK_EN, mask_sh),\
 	SF(ODM0_OPTC_INPUT_CLOCK_CONTROL, OPTC_INPUT_CLK_ON, mask_sh),\
@@ -302,6 +305,7 @@ struct dcn_tg_registers {
 	type OTG_CLOCK_EN;\
 	type OTG_CLOCK_ON;\
 	type OTG_CLOCK_GATE_DIS;\
+	type OTG_VERTICAL_INTERRUPT2_INT_ENABLE;\
 	type OTG_VERTICAL_INTERRUPT2_LINE_START;\
 	type OPTC_INPUT_CLK_EN;\
 	type OPTC_INPUT_CLK_ON;\