drm/i915: add support for checking RPM atomic sections

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In some cases we want to check whether we hold an RPM wakelock reference
for the whole duration of a sequence. To achieve this add a new RPM
atomic sequence counter that we increment any time the wakelock refcount
drops to zero.  Check whether the sequence number stays the same during
the atomic section and that we hold the wakelock at the beginning of the
section.

Motivated by Chris.

v2-v3:
- unchanged
v4:
- swap the order of atomic_read() and assert_rpm_wakelock_held() in
  assert_rpm_atomic_begin() to avoid race

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> (v3)
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450203038-5150-10-git-send-email-imre.deak@intel.com

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This commit is contained in:

Imre Deak 2015-12-15 20:10:37 +02:00

parent 542db3cd34

commit 2b19efebf1

4 changed files with 21 additions and 1 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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17

drivers/gpu/drm/i915/intel_drv.h

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1

drivers/gpu/drm/i915/intel_pm.c

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3

drivers/gpu/drm/i915/intel_runtime_pm.c

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