Commit d8135109 authored by Imre Deak's avatar Imre Deak Committed by Daniel Vetter

drm/i915/bxt: fix RC6 residency time calculation

The RC6 residency time unit is 833.33ns on BXT according to the
specification, so update the calculation accordingly. Use the same way
as CHV/VLV to divide by the corresponding frequency, as I think this is
the more natural unit for what the HW does internally.

v2:
- add missing IS_BROXTON check (Ville)

Testcase: igt/pm_rc6_residency
Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 93f25318
...@@ -54,6 +54,9 @@ static u32 calc_residency(struct drm_device *dev, const u32 reg) ...@@ -54,6 +54,9 @@ static u32 calc_residency(struct drm_device *dev, const u32 reg)
if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH) if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
units <<= 8; units <<= 8;
} else if (IS_BROXTON(dev)) {
units = 1;
div = 1200; /* 833.33ns */
} }
raw_time = I915_READ(reg) * units; raw_time = I915_READ(reg) * units;
......
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