diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.19.8/0870-drm-amd-display-Fix-unintialized-max_bpc-state-value.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.19.8/0870-drm-amd-display-Fix-unintialized-max_bpc-state-value.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0870-drm-amd-display-Fix-unintialized-max_bpc-state-value.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0870-drm-amd-display-Fix-unintialized-max_bpc-state-value.patch new file mode 100644 index 00000000..5804c9c0 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0870-drm-amd-display-Fix-unintialized-max_bpc-state-value.patch @@ -0,0 +1,52 @@ +From a280ea245d48d27cb3baed4bea324b5902d1c927 Mon Sep 17 00:00:00 2001 +From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> +Date: Wed, 28 Nov 2018 16:17:50 -0500 +Subject: [PATCH 0870/2940] drm/amd/display: Fix unintialized max_bpc state + values + +[Why] +If the "max bpc" isn't explicitly set in the atomic state then it +have a value of 0. This has the correct behavior of limiting a panel +to 8bpc in the case where the panel supports 8bpc. In the case of eDP +panels this isn't a true assumption - there are panels that can only +do 6bpc. + +Banding occurs for these displays. + +[How] +Initialize the max_bpc when the connector resets to 8bpc. Also carry +over the value when the state is duplicated. + +Bugzilla: https://bugs.freedesktop.org/108825 +Fixes: 307638884f72 ("drm/amd/display: Support amdgpu "max bpc" connector property") + +Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> +Reviewed-by: Alex Deucher <alexander.deucher@amd.com> +Signed-off-by: Alex Deucher <alexander.deucher@amd.com> +--- + drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +index d3f9f8e8cc5c..e40784bc532b 100644 +--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c ++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +@@ -3245,6 +3245,7 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector) + state->underscan_enable = false; + state->underscan_hborder = 0; + state->underscan_vborder = 0; ++ state->max_bpc = 8; + + __drm_atomic_helper_connector_reset(connector, &state->base); + } +@@ -3266,6 +3267,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector) + + new_state->freesync_capable = state->freesync_capable; + new_state->abm_level = state->abm_level; ++ new_state->max_bpc = state->max_bpc; + + return &new_state->base; + } +-- +2.17.1 + |