drm/i915/skl: Disable coarse power gating up until F0
authorMika Kuoppala <mika.kuoppala@linux.intel.com>
Mon, 7 Dec 2015 16:29:44 +0000 (18:29 +0200)
committerJani Nikula <jani.nikula@intel.com>
Tue, 8 Dec 2015 13:55:57 +0000 (15:55 +0200)
commit6686ece19f7446f0e29c77d9e0402e1d0ce10c48
treeaf45ea3347bc6f88eb06c4e40eac97ffd608fbaf
parentdfaf37baa07513d2c37afff79978807d2d10221a
drm/i915/skl: Disable coarse power gating up until F0

There is conflicting info between E0 and F0 steppings
for this workarounds. Trust more authoritative source and
be conservative and extend also for F0.

This prevents numerous (>50) gpu hangs with SKL GT4e
during piglit run.

References: HSD: gen9lp/2134184
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449505785-20812-1-git-send-email-mika.kuoppala@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/intel_pm.c