forked from luck/tmp_suning_uos_patched
a9c1f90c8e
Submitting a batchbuffer which simulates a gpu hang by doing MI_BATCH_BUFFER_START into itself, to test hangcheck, started to hard hang the whole box (IVB). Bisecting lead to this commit: commit 664b422c2966cd39b8f67e8d53a566ea8c877cd6 Author: Vinit Azad <vinit.azad@intel.com> Date: Wed Aug 14 13:34:33 2013 -0700 drm/i915: Only unmask required PM interrupts Experimenting with the mask register showed that unmasking EI UP will prevent the hard hang in IVB and SNB. HSW doesn't hang with EI UP masked. Considering we are just disabling interrupts that aren't even delivered to driver, this change is more likely to paper over some weirdness in gpu's internal state machine. But until better explanation can be found, let's trade little bit of power for stability on these architectures. v2: - Unmask EI_EXPIRED directly in I915_WRITE (Vinit) v3: - Only unmask on SNB and IVB Cc: Vinit Azad <vinit.azad@intel.com> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Acked-by: Vinit Azad <vinit.azad@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
||
---|---|---|
.. | ||
drm | ||
host1x | ||
vga | ||
Makefile |