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From 356beb979312bc7885fb4f59b2cfefe30b208f0a Mon Sep 17 00:00:00 2001
From: Vitaly Prosyak <vitaly.prosyak@amd.com>
Date: Thu, 12 Jul 2018 14:26:47 -0500
Subject: [PATCH 5085/5725] drm/amd/display: Add check for num of entries in
gamma
This check avoids potential bugs related to gamma.
Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@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 646e60d..e130aac 100644
--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
@@ -1575,7 +1575,8 @@ bool mod_color_calculate_degamma_params(struct dc_transfer_func *input_tf,
/* we can use hardcoded curve for plain SRGB TF */
if (input_tf->type == TF_TYPE_PREDEFINED &&
input_tf->tf == TRANSFER_FUNCTION_SRGB &&
- (!mapUserRamp && ramp->type == GAMMA_RGB_256))
+ (!mapUserRamp &&
+ (ramp->type == GAMMA_RGB_256 || ramp->num_entries == 0)))
return true;
input_tf->type = TF_TYPE_DISTRIBUTED_POINTS;
--
2.7.4
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