On Thu, Nov 05, 2015 at 01:11:38PM +0200, Mika Kuoppala wrote: > We have a timed release of a forcewake when using > I915_READ/WRITE macros. wait_for() macro will go to quite > long sleep if the first read doesn't satisfy the condition for > successful exit. With these two interacting, it is possible that > we lose the forcewake during the wait_for() and the subsequent read > will reaquire forcewake. > > Further experiments with skl shows that when we lose forcewake, > we lose the reset request we submitted. So reset request register > is not power context saved. > > Grab forcewakes for all engines before starting the reset/request > dance so that all requests stay valid for the duration of reset > requisition across all the engines. > > v2: Add comment on power well sleeps. Wrap the reset handling > under forcewake instead of just reset requests (Chris) > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92774 > Cc: Chris Wilson <ch...@chris-wilson.co.uk> > Tested-by: Tomi Sarvela <tomix.p.sarv...@intel.com> (v1, v2) > Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com> Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk> -Chris
-- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
