[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>
state->underscan_enable = false;
state->underscan_hborder = 0;
state->underscan_vborder = 0;
+ state->max_bpc = 8;
__drm_atomic_helper_connector_reset(connector, &state->base);
}
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;
}