On Mon, May 11, 2015 at 12:05:27PM +0100, Peter Antoine wrote: > This patch fixed a timing issue that causes a GPU hang when a the system > comes out of power saving. > > During pm_resume, We are submitting batchbuffers before enabling > Interrupts this is causing us to miss the context switch interrupt, > and in consequence intel_execlists_handle_ctx_events is not triggered. > > This patch is based on a patch from Deepak S <deepak.s@xxxxxxxxx> > from another platform. > > The patch fixes an issue introduced by: > commit e7778be1eab918274f79603d7c17b3ec8be77386 > drm/i915: Fix startup failure in LRC mode after recent init changes > > The above patch added a call to init_context() to fix an issue introduced > by a previous patch. But, it then opened up a small timing window for the > batches being added by the init_context (basically setting up the context) > to complete before the interrupts have been turned on, thus hanging the > GPU. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89600 > Signed-off-by: Peter Antoine <peter.antoine@xxxxxxxxx> > --- > drivers/gpu/drm/i915/i915_drv.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) <formletter> This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read Documentation/stable_kernel_rules.txt for how to do this properly. </formletter> _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
