linux-kernel - [RFC PATCH 28/40] drm/amd/display: set sdr_ref_white_level to 80 for out_transfer

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Date:   Sun, 23 Apr 2023 13:10:40 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     amd-gfx@...ts.freedesktop.org,
        Harry Wentland <harry.wentland@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        sunpeng.li@....com, Alex Deucher <alexander.deucher@....com>,
        dri-devel@...ts.freedesktop.org, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch
Cc:     Joshua Ashton <joshua@...ggi.es>,
        Sebastian Wick <sebastian.wick@...hat.com>,
        Xaver Hugl <xaver.hugl@...il.com>,
        Shashank Sharma <Shashank.Sharma@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        sungjoon.kim@....com, Alex Hung <alex.hung@....com>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 28/40] drm/amd/display: set sdr_ref_white_level to 80 for out_transfer_func

From: Joshua Ashton <joshua@...ggi.es>

Otherwise this is just initialized to 0.

This needs to actually have a value so that compute_curve can work
for PQ EOTF.

Signed-off-by: Joshua Ashton <joshua@...ggi.es>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index 55aa876a5008..6e7271065a56 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -323,6 +323,7 @@ static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
 		 */
 		stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
 		stream->out_transfer_func->tf = tf;
+		stream->out_transfer_func->sdr_ref_white_level = 80;
 
 		ret = __set_output_tf(stream->out_transfer_func,
 				      regamma_lut, regamma_size, has_rom);
-- 
2.39.2