drm/amd/display: Make sure v_total_min and max not less than v_total.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_timing_generator.c

@@ -393,12 +393,12 @@ void dce110_timing_generator_set_drr(
 		params->vertical_total_min > 0) {
 
 		set_reg_field_value(v_total_max,
-				params->vertical_total_max,
+				params->vertical_total_max - 1,
 				CRTC_V_TOTAL_MAX,
 				CRTC_V_TOTAL_MAX);
 
 		set_reg_field_value(v_total_min,
-				params->vertical_total_min,
+				params->vertical_total_min - 1,
 				CRTC_V_TOTAL_MIN,
 				CRTC_V_TOTAL_MIN);
 

drivers/gpu/drm/amd/display/dc/dce120/dce120_timing_generator.c

@@ -540,10 +540,10 @@ void dce120_timing_generator_set_drr(
 
 		CRTC_REG_UPDATE(
 				CRTC0_CRTC_V_TOTAL_MIN,
-				CRTC_V_TOTAL_MIN, params->vertical_total_min);
+				CRTC_V_TOTAL_MIN, params->vertical_total_min - 1);
 		CRTC_REG_UPDATE(
 				CRTC0_CRTC_V_TOTAL_MAX,
-				CRTC_V_TOTAL_MAX, params->vertical_total_max);
+				CRTC_V_TOTAL_MAX, params->vertical_total_max - 1);
 		CRTC_REG_SET_N(CRTC0_CRTC_V_TOTAL_CONTROL, 6,
 				FD(CRTC0_CRTC_V_TOTAL_CONTROL__CRTC_V_TOTAL_MIN_SEL), 1,
 				FD(CRTC0_CRTC_V_TOTAL_CONTROL__CRTC_V_TOTAL_MAX_SEL), 1,

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

@@ -347,6 +347,7 @@ static void calc_vmin_vmax(struct core_freesync *core_freesync,
 {
 	unsigned int min_frame_duration_in_ns = 0, max_frame_duration_in_ns = 0;
 	unsigned int index = map_index_from_stream(core_freesync, stream);
+	uint32_t vtotal = stream->timing.v_total;
 
 	min_frame_duration_in_ns = ((unsigned int) (div64_u64(
 					(1000000000ULL * 1000000),
@@ -362,6 +363,17 @@ static void calc_vmin_vmax(struct core_freesync *core_freesync,
 	*vmin = div64_u64(div64_u64(((unsigned long long)(
 			min_frame_duration_in_ns) * stream->timing.pix_clk_khz),
 			stream->timing.h_total), 1000000);
+
+	/* In case of 4k free sync monitor, vmin or vmax cannot be less than vtotal */
+	if (*vmin < vtotal) {
+		ASSERT(false);
+		*vmin = vtotal;
+	}
+
+	if (*vmax < vtotal) {
+		ASSERT(false);
+		*vmax = vtotal;
+	}
 }
 
 static void calc_v_total_from_duration(const struct dc_stream *stream,