Re: [Intel-gfx] [PATCH 02/10] drm/i915: Implement w/a for sporadic read failures on waking from rc6

On Mon, 2 Jul 2012 11:51:03 -0300 Eugeni Dodonov wrote: > From: Chris Wilson > > As a w/a to prevent reads sporadically returning 0, we need to wait for > the GT thread to return to TC0 before proceeding to read the registers. > > v2: adapt for Haswell changes (Eugeni). > > v3: use wait_for_

[Intel-gfx] [PATCH 02/10] drm/i915: Implement w/a for sporadic read failures on waking from rc6

From: Chris Wilson As a w/a to prevent reads sporadically returning 0, we need to wait for the GT thread to return to TC0 before proceeding to read the registers. v2: adapt for Haswell changes (Eugeni). v3: use wait_for_atomic_us for thread status polling. v3: *really* use wait_for_atomic for