On 06/21/2017 06:19 PM, Eric Anholt wrote: > Mario Kleiner <mario.kleiner.de at gmail.com> writes: > >> With instantaneous high precision vblank timestamping >> that updates at leading edge of vblank, the emulated >> "hw vblank counter" from vblank timestamping which >> increments at leading edge of vblank, and reliable >> page flip execution and completion at leading edge >> of vblank, we should meet the requirements for fast >> vblank irq disable/enable. >> >> Testing against rpi-4.12-rc5 Linux kernel with timing >> measurement equipment indicates this works fine, >> so allow immediate vblank disable for power saving. >> >> For debugging in case of unexpected trouble, booting >> with kernel cmdline option drm.vblankoffdelay=0 >> would keep vblank irqs on to approximate old behavior. >> >> Signed-off-by: Mario Kleiner <mario.kleiner.de at gmail.com> >> Cc: Eric Anholt <eric at anholt.net> > > If you can spin this against drm-misc-next instead of the downstream > tree, I can get it applied. > Done, thanks! -mario
