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From a3341c8396d18832ea305384a18e0cc3095f38fa Mon Sep 17 00:00:00 2001
From: Jaehyun Chung <jaehyun.chung@amd.com>
Date: Mon, 23 Sep 2019 10:00:57 -0400
Subject: [PATCH 4077/4256] drm/amd/display: Add capability check for static
ramp calc
[Why]
Static ramp to max refresh rate does not have capability check on
calculated v_total. Programming a lower v_total_min and max than the
total causes continuous spurious HPDs.
[How]
Add a capability check after v_total calculation similar to calculate
v_total helper functions.
Signed-off-by: Jaehyun Chung <jaehyun.chung@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
---
drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index 65faaf6802e0..9d68cfecd472 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -232,6 +232,10 @@ static void update_v_total_for_static_ramp(
current_duration_in_us) * (stream->timing.pix_clk_100hz / 10)),
stream->timing.h_total), 1000);
+ /* v_total cannot be less than nominal */
+ if (v_total < stream->timing.v_total)
+ v_total = stream->timing.v_total;
+
in_out_vrr->adjust.v_total_min = v_total;
in_out_vrr->adjust.v_total_max = v_total;
}
--
2.17.1
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