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drm/i915: Use czclk_freq in vlv c0 residency calculations 

Replace the use of mem_freq/4 with czclk_freq in the vlv c0 residency
calculations.

Also deal with VLV_COUNT_RANGE_HIGH which affects all RCx residency
counters. We have just enough bits to do this without intermediate
divisions.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-09-24 23:29:20 +03:00 committed by Daniel Vetter
parent 2cc9fab180
commit 7bad74d57c
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/i915_irq.c
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@ -997,12 +997,16 @@ static bool vlv_c0_above(struct drm_i915_private *dev_priv,
int threshold)
{
u64 time, c0;
unsigned int mul = 100;
if (old->cz_clock == 0)
return false;
if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
mul <<= 8;
time = now->cz_clock - old->cz_clock;
time *= threshold * dev_priv->mem_freq;
time *= threshold * dev_priv->czclk_freq;
/* Workload can be split between render + media, e.g. SwapBuffers
* being blitted in X after being rendered in mesa. To account for
@ -1010,7 +1014,7 @@ static bool vlv_c0_above(struct drm_i915_private *dev_priv,
*/
c0 = now->render_c0 - old->render_c0;
c0 += now->media_c0 - old->media_c0;
c0 *= 100 * VLV_CZ_CLOCK_TO_MILLI_SEC * 4 / 1000;
c0 *= mul * VLV_CZ_CLOCK_TO_MILLI_SEC;
return c0 >= time;
}