1 files changed, 39 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/1539-drm-amd-display-Re-add-custom-degamma-support.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/1539-drm-amd-display-Re-add-custom-degamma-support.patch
new file mode 100644
index 00000000..35412614
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/1539-drm-amd-display-Re-add-custom-degamma-support.patch
@@ -0,0 +1,39 @@
+From 42add52df35a3eb337a2d1b26874f5cf633a3245 Mon Sep 17 00:00:00 2001
+From: David Francis <David.Francis@amd.com>
+Date: Mon, 11 Feb 2019 14:15:19 -0500
+Subject: [PATCH 1539/2940] drm/amd/display: Re-add custom degamma support
+
+[Why]
+The dc_gamma_type CUSTOM_GAMMA is used to represent degamma
+mappings passed in by drm. This type of gamma must be interpolated
+into a transfer function by apply_1d_lut.  The line in
+mod_color_calculate_degamma_params that handled this case
+was erroneously removed.
+
+[How]
+For CUSTOM_GAMMA degamma, calculate the lut as before.
+
+Change-Id: I3d75fa94e19fdb25294a0784e949946cc8c58e4b
+Signed-off-by: David Francis <David.Francis@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 | 2 ++
+ 1 file changed, 2 insertions(+)
+
+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 0fbc8fbc3541..a1055413bade 100644
+--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
++++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c
+@@ -1854,6 +1854,8 @@ bool mod_color_calculate_degamma_params(struct dc_transfer_func *input_tf,
+ 			coordinates_x, axis_x, curve,
+ 			MAX_HW_POINTS, tf_pts,
+ 			mapUserRamp && ramp && ramp->type == GAMMA_RGB_256);
++	if (ramp->type == GAMMA_CUSTOM)
++		apply_lut_1d(ramp, MAX_HW_POINTS, tf_pts);
+ 
+ 	ret = true;
+ 
+-- 
+2.17.1
+