drm/i915: Extend vlv/chv residency resolution

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Vlv and chv residency counters are 40 bits in width.
With a control bit, we can choose between upper or lower
32 bit window into this counter.

Lets toggle this bit on and off on and read both parts.
As a result we can push the wrap from 13 seconds to 54
minutes.

v2: commit msg, loop readability, goto elimination (Chris)
v3: bug ref, divide outside runtime pm lock (Chris)

References: https://bugs.freedesktop.org/show_bug.cgi?id=94852
Reported-by: Len Brown <len.brown@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

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Mika Kuoppala 2017-03-15 18:07:13 +02:00 • committed by Mika Kuoppala

parent c5a0ad114b

commit 47c21d9a1a

1 changed files with 51 additions and 9 deletions

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drivers/gpu/drm/i915/intel_pm.c

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