On Wed, Jan 25, 2012 at 02:04:00PM +0100, Daniel Vetter wrote: > We still have reports of missed irqs even on Sandybridge with the > HWSTAM workaround in place. Testing by the bug reporter gets rid of > them with the forcewake voodoo and no HWSTAM writes. > > Because I've slightly botched the rebasing I've left out the ACTHD > readback which is also required to get IVB working. Seems to still > work on the tester's machine, so I think we should go with the more > minmal approach on SNB. Especially since I've only found weak evidence > for holding forcewake while waiting for an interrupt to arrive, but > none for the ACTHD readback. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45181 > Tested-by: Nicolas Kalkhof nkalkhof()at()web.de > Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch> Another bug reporter just confirmed that this patch gets rid of 'missed IRQ?' quasi-hangs on snb. Unfortunately there's still another bug left to squash, which hangs the gpu ... Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45332 -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
