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H A D | i915_irq.c | diff acf2dc2266b99be9103b5c35acbb8f9fe923bf3d Thu Apr 13 06:15:27 CDT 2017 Mika Kuoppala <mika.kuoppala@linux.intel.com> drm/i915: Fix system hang with EI UP masked on Haswell
Previously with commit a9c1f90c8e17 ("drm/i915: Don't mask EI UP interrupt on IVB|SNB") certain, seemingly unrelated bit (GEN6_PM_RP_UP_EI_EXPIRED) was needed to be unmasked for IVB and SNB in order to prevent system hang with chained batchbuffers.
Our CI was seeing incomplete results with tests that used chained batches and it was found out that HSW needs to have this same bit unmasked to reliably survive chained batches.
Always unmask GEN6_PM_RP_UP_EI_EXPIRED on Haswell to prevent system hang with batch chaining.
Testcase: igt/gem_exec_fence/nb-await-default Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100672 Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@vger.kernel.org Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1492082127-29007-1-git-send-email-mika.kuoppala@intel.com (cherry picked from commit 3396a273851c14634b98bb27be37508b06df94f4) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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