On Mon, 7 Jul 2014, Chris Wilson wrote: > > > this patch on top of v3.16-rc3-62-gd92a333 makes the resume from ram > > > regression go away on my machine: > > > > Hm, we could conditionalize this hack on IS_G4X ... Chris, thoughts? > > As different machines favour different w/a, I think the issue is mostly > timing related. It could be sequence of register writes, but we tried > different orders early on. The next experiment I guess would be to > insert small delays between each write to see if that helps. Or to write > each register twice. I actually tried to introduce rather large delays between individual I915_WRITE() calls in the ring initialization sequence a couple weeks ago already, but it resulted in complete machine lockup (which is worse than my usual symptoms) during resume. Therefore I probably lack the knowledge of internal workings of the HW that would allow me to guess what the reasonable timeout value should be. Willing to test any patches. -- Jiri Kosina SUSE Labs _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
