[PATCH 22/26] drm/amd/display: Fix incorrect end slope of EETF

[Bhawanpreet Lakha]

From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy at amd.com>

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 at amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at 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 2e215c9e5445..bba518684243 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -789,7 +789,8 @@ 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);
-- 
2.14.1