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

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 9d67b485303005771a090ea7a3c1e1c6f8b74e9e..c74e4e8006d4b28e02ae9fb44ee11f491e130775 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -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;
 }