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From 7f74b1e45cc1f554a61ee946a0d478857ec5d558 Mon Sep 17 00:00:00 2001
From: Eric Cook <Eric.Cook@amd.com>
Date: Wed, 26 Apr 2017 11:51:38 -0400
Subject: [PATCH 0379/4131] drm/amd/display: Check for Zero Range in FreeSync
Calc
-check for min/max range in freesync calculation and handle it accordingly
Signed-off-by: Eric <eric.cook@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index d3d5700..009cb79 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -363,6 +363,21 @@ static void calc_freesync_range(struct core_freesync *core_freesync,
unsigned int index = map_index_from_stream(core_freesync, stream);
uint32_t vtotal = stream->timing.v_total;
+ if ((min_refresh_in_uhz == 0) || (max_refresh_in_uhz == 0)) {
+ state->freesync_range.min_refresh =
+ state->nominal_refresh_rate_in_micro_hz;
+ state->freesync_range.max_refresh =
+ state->nominal_refresh_rate_in_micro_hz;
+
+ state->freesync_range.max_frame_duration = 0;
+ state->freesync_range.min_frame_duration = 0;
+
+ state->freesync_range.vmax = vtotal;
+ state->freesync_range.vmin = vtotal;
+
+ return;
+ }
+
min_frame_duration_in_ns = ((unsigned int) (div64_u64(
(1000000000ULL * 1000000),
max_refresh_in_uhz)));
--
2.7.4
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