On Wed, Dec 09, 2015 at 04:10:03PM +0200, Imre Deak wrote: > On ke, 2015-12-09 at 15:56 +0200, Joonas Lahtinen wrote: > > In order to avoid accessing GPU registers while GPU is suspended > > cancel > > the hangcheck work before calling intel_suspend_complete which > > actually > > puts the GPU to suspend. Otherwise hangcheck might do MMIO reads to a > > suspended GPU. > > > > Placement before intel_guc_suspend is imitated from i915_drm_suspend > > which cancels the work at i915_gem_suspend, to keep the functions > > similar. > > > > On VLV systems, namely BYT, this was causing an error during runtime > > suspend cycle: > > > > [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register access while > > GT waking disabled > > > > Testcase: igt/pm_rpm/basic-rte > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93121 > > > > Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > > Cc: Imre Deak <imre.deak@xxxxxxxxx> > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Yep, looks good to me: > Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx> Well Imre also shotdown the simple tryget plan, so the only thing I can say is that I'd rather move the cancel_sync(hangcheck) out of the intel_runtime_suspend() into the mark_idle to match it's counterpart in mark_busy. Patch in the post, so for now Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
