From: Krunoslav Kovac <Krunoslav.Kovac@xxxxxxx> [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@xxxxxxx> Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx> Acked-by: Leo Li <sunpeng.li@xxxxxxx> --- drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) 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 85dad356c9d5..1de4805cb8c7 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -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 max_display = dc_fixpt_from_int(100); - if (fs_params->min_content < fs_params->min_display) - use_eetf = true; - else - min_content = min_display; - + // only max used, we don't adjust min luminance if (fs_params->max_content > fs_params->max_display) use_eetf = true; else -- 2.23.0 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
