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| author | Arnd Bergmann <arnd@arndb.de> | 2011-12-27 23:41:33 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-12-27 23:41:33 +0000 |
| commit | 4551ae0a24bba06972247a80f721fc21f6b2b758 (patch) | |
| tree | 7e17b819ba34f73988d384161335ebe5729897ad /drivers/gpu/drm/i915/i915_dma.c | |
| parent | e2c236f0a42fbb9e6a9528f8436f348218ffee96 (diff) | |
| parent | 384703b8e6cd4c8ef08512e596024e028c91c339 (diff) | |
| download | linux-4551ae0a24bba06972247a80f721fc21f6b2b758.tar.gz | |
Merge branch 'v3.2-rc6' into next/drivers
Diffstat (limited to 'drivers/gpu/drm/i915/i915_dma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index a9533c54c93c..a9ae374861e7 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1454,6 +1454,14 @@ unsigned long i915_chipset_val(struct drm_i915_private *dev_priv) diff1 = now - dev_priv->last_time1; + /* Prevent division-by-zero if we are asking too fast. + * Also, we don't get interesting results if we are polling + * faster than once in 10ms, so just return the saved value + * in such cases. + */ + if (diff1 <= 10) + return dev_priv->chipset_power; + count1 = I915_READ(DMIEC); count2 = I915_READ(DDREC); count3 = I915_READ(CSIEC); @@ -1484,6 +1492,8 @@ unsigned long i915_chipset_val(struct drm_i915_private *dev_priv) dev_priv->last_count1 = total_count; dev_priv->last_time1 = now; + dev_priv->chipset_power = ret; + return ret; } |