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Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/4255-drm-amd-display-Only-use-EETF-when-maxCL-max-display.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/4255-drm-amd-display-Only-use-EETF-when-maxCL-max-display.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/4255-drm-amd-display-Only-use-EETF-when-maxCL-max-display.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/4255-drm-amd-display-Only-use-EETF-when-maxCL-max-display.patch new file mode 100644 index 00000000..a55b89c6 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/4255-drm-amd-display-Only-use-EETF-when-maxCL-max-display.patch @@ -0,0 +1,43 @@ +From ccd1cf77b10a987d5287b07fef6fcb21cc647b42 Mon Sep 17 00:00:00 2001 +From: Krunoslav Kovac <Krunoslav.Kovac@amd.com> +Date: Fri, 4 Oct 2019 13:49:03 -0400 +Subject: [PATCH 4255/4736] drm/amd/display: Only use EETF when maxCL > max + display + +[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> +--- + 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 0accdae5e675..962a57f75e12 100644 +--- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c ++++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +@@ -956,11 +956,7 @@ 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 +-- +2.17.1 + |