On Mon, Oct 10, 2016 at 11:35:07AM +0200, Maarten Lankhorst wrote: > Op 07-10-16 om 21:49 schreef Chris Wilson: > > To enable the vblank itself, we need to have an RPM wakeref for the mmio > > access, and whilst generating the vblank interrupts we continue to > > require the rpm wakeref. The assumption is that the RPM wakeref is held > > by the display powerwell held by the active pipe. As this chain was not > > obvious to me chasing the drm_wait_vblank ioctl, document it with a WARN > > during *_vblank_enable(). > > > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > Don't we prevent enabling the vblank irq through drm_crtc_vblank_on/off? Should, but this is the boundary point from the midlayer, so sanitychecks ahoy. > I'd rather not have things look at crtc->state if possible, locking might not help you. Ok, anything better? -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
