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From 74bc5d8dfd1da9b570159b1708c42273ef913e0f Mon Sep 17 00:00:00 2001
From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
Date: Tue, 2 Oct 2018 08:44:04 -0400
Subject: [PATCH 5596/5725] drm/amd/display: Fix incorrect end slope of EETF
Force the E2 to dc_fixpt_one when E1 exceeds that value. This is the
correct thing to do to avoid corruption.
Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
---
drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
index 423e8c1..7b10c74 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -791,7 +791,8 @@ static void hermite_spline_eetf(struct fixed31_32 input_x,
// (t^3 - 2t^2 + t) * (1-ks)
E2 = dc_fixpt_add(E2, dc_fixpt_mul(temp2,
dc_fixpt_add(t, dc_fixpt_sub(t3, temp1))));
- }
+ } else
+ E2 = dc_fixpt_one;
temp1 = dc_fixpt_sub(dc_fixpt_one, E2);
temp2 = dc_fixpt_mul(temp1, temp1);
--
2.7.4
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