• Li Peng's avatar
    drm/i915: Fix sync to vblank when VGA output is turned off · 778c9026
    Li Peng authored
    In current vblank-wait implementation, if we turn off VGA output,
    drm_wait_vblank will still wait on the disabled pipe until timeout,
    because vblank on the pipe is assumed be enabled. This would cause
    slow system response on some system such as moblin.
    
    This patch resolve the issue by adding a drm helper function
    drm_vblank_off which explicitly clear vblank_enabled[crtc], wake up
    any waiting queue and save last vblank counter before turning off
    crtc. It also slightly change drm_vblank_get to ensure that we will
    will return immediately if trying to wait on a disabled pipe.
    Signed-off-by: default avatarLi Peng <peng.li@intel.com>
    Reviewed-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
    [anholt: hand-applied for conflicts with overlay changes]
    Signed-off-by: default avatarEric Anholt <eric@anholt.net>
    778c9026
drm_irq.c 20.3 KB