[Intel-gfx] [RFC] Reduce idle vblank wakeups
mjg59 at srcf.ucam.org
Wed Nov 16 09:11:22 PST 2011
On Wed, Nov 16, 2011 at 06:03:15PM +0100, Michel Dänzer wrote:
> I thought the main reason for the delay wasn't broken hardware but to
> avoid constantly ping-ponging the vblank IRQ between on and off with
> apps which regularly neeed the vblank counter value, as that could make
> the counter unreliable. Maybe I'm misremembering though.
If turning it on and off results in the counter value being wrong then
surely that's a hardware problem? I've tested that turning it on and off
between every IRQ still gives valid counter values on sandybridge.
Matthew Garrett | mjg59 at srcf.ucam.org
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