From: Nicholas Kazlauskas Date: Wed, 28 Nov 2018 21:17:50 +0000 (-0500) Subject: drm/amd/display: Fix unintialized max_bpc state values X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=49f1c44b581b08e3289127ffe58bd208c3166701;p=openwrt%2Fstaging%2Fblogic.git 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 Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- 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 ca925200fe09..33b605b259c2 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -3042,6 +3042,7 @@ 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); } @@ -3063,6 +3064,7 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector) new_state->freesync_capable = state->freesync_capable; new_state->freesync_enable = state->freesync_enable; + new_state->max_bpc = state->max_bpc; return &new_state->base; }