diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2490-drm-amd-display-Use-1-8th-DSC-target-bitrate-precisi.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2490-drm-amd-display-Use-1-8th-DSC-target-bitrate-precisi.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2490-drm-amd-display-Use-1-8th-DSC-target-bitrate-precisi.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2490-drm-amd-display-Use-1-8th-DSC-target-bitrate-precisi.patch new file mode 100644 index 00000000..6c94f39c --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/2490-drm-amd-display-Use-1-8th-DSC-target-bitrate-precisi.patch @@ -0,0 +1,41 @@ +From e9ebe3632eae3481a170263462000b86dd348232 Mon Sep 17 00:00:00 2001 +From: Nikola Cornij <nikola.cornij@amd.com> +Date: Thu, 28 Mar 2019 13:47:25 -0400 +Subject: [PATCH 2490/2940] drm/amd/display: Use 1/8th DSC target bitrate + precision for N4:2:2 and 4:2:0 formats + +[why] +On at least some of the devices (e.g. Realtek scaler) we get a black screen if 1/16th +precision is used. + +[how] +Work around it by reducing precision to 1/8th for N4:2:2 and 4:2:0 color formats. This +is a safe workaround and would have a very mild impact on the quality. +The issue is still to be root-caused and fixed correctly. + +Signed-off-by: Nikola Cornij <nikola.cornij@amd.com> +Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> +Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c +index 471eb9873885..c649f62d183d 100644 +--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c ++++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c +@@ -228,6 +228,10 @@ static bool dc_intersect_dsc_caps( + + dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div); + ++ // TODO DSC: Remove this workaround for N422 and 420 once it's fixed, or move it to get_dsc_encoder_caps() ++ if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420) ++ dsc_common_caps->bpp_increment_div = min(dsc_common_caps->bpp_increment_div, (uint32_t)8); ++ + return true; + } + +-- +2.17.1 + |