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drm/i915: fix GMCH power reporting 

The IPS driver needs to know the current power consumption of the GMCH
in order to make decisions about when to increase or decrease the CPU
and/or GPU power envelope.  So fix up the divisions to save the results
so the numbers are actually correct (contrary to some earlier comments
and code, these functions do not modify the first argument and use it
for the result).

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
This commit is contained in:
Jesse Barnes 2010-09-27 10:35:44 -07:00 committed by Chris Wilson
parent cf9a2f3afc
commit d270ae34eb
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/i915_dma.c
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@ -1787,9 +1787,9 @@ unsigned long i915_chipset_val(struct drm_i915_private *dev_priv)
}
}
div_u64(diff, diff1);
diff = div_u64(diff, diff1);
ret = ((m * diff) + c);
div_u64(ret, 10);
ret = div_u64(ret, 10);
dev_priv->last_count1 = total_count;
dev_priv->last_time1 = now;
@ -1858,7 +1858,7 @@ void i915_update_gfx_val(struct drm_i915_private *dev_priv)
/* More magic constants... */
diff = diff * 1181;
div_u64(diff, diffms * 10);
diff = div_u64(diff, diffms * 10);
dev_priv->gfx_power = diff;
}