• Nicholas Kazlauskas's avatar
    drm/amd/display: Reject overlay plane configurations in multi-display scenarios · 168f09cd
    Nicholas Kazlauskas authored
    [Why]
    These aren't stable on some platform configurations when driving
    multiple displays, especially on higher resolution.
    
    In particular the delay in asserting p-state and validating from
    x86 outweights any power or performance benefit from the hardware
    composition.
    
    Under some configurations this will manifest itself as extreme stutter
    or unresponsiveness especially when combined with cursor movement.
    
    [How]
    Disable these for now. Exposing overlays to userspace doesn't guarantee
    that they'll be able to use them in any and all configurations and it's
    part of the DRM contract to have userspace gracefully handle validation
    failures when they occur.
    
    Valdiation occurs as part of DC and this in particular affects RV, so
    disable this in dcn10_global_validation.
    Signed-off-by: default avatarNicholas Kazlauskas <nicholas.kazlauskas@amd.com>
    Reviewed-by: default avatarHersen Wu <hersenxs.wu@amd.com>
    Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
    168f09cd
dcn10_resource.c 42.1 KB