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drm/amd/display: Only use EETF when maxCL > max display

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[Why&How]
BT.2390 EETF is used for tone mapping/range reduction.
Say display is 0.1 - 500 nits.
The problematic case is when content is 0-400. We apply EETF because
0<0.1 so we need to reduce the range by 0.1.

In the commit, we ignore the bottom range. Most displays map 0 to min and
then have a ramp to 0.1, so sending 0.1 is actually >0.1.
Furthermode, HW that uses 3D LUT also assumes min=0.

Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Krunoslav Kovac 2019-10-04 13:49:03 -04:00 committed by Alex Deucher
parent 622a88c825
commit 50575eb5b3
1 changed files with 1 additions and 5 deletions
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6
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@ -959,11 +959,7 @@ static bool build_freesync_hdr(struct pwl_float_data_ex *rgb_regamma,
if (fs_params->max_display < 100) // cap at 100 at the top if (fs_params->max_display < 100) // cap at 100 at the top
max_display = dc_fixpt_from_int(100); max_display = dc_fixpt_from_int(100);
if (fs_params->min_content < fs_params->min_display) // only max used, we don't adjust min luminance
use_eetf = true;
else
min_content = min_display;
if (fs_params->max_content > fs_params->max_display) if (fs_params->max_content > fs_params->max_display)
use_eetf = true; use_eetf = true;
else else