Sandybridge, at least, seems to manage without any vblank offdelay. Dropping this reduces the number of wakeups on an otherwise idle system dramatically.
Signed-off-by: Matthew Garrett mjg@redhat.com --- drivers/gpu/drm/i915/i915_dma.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index a9533c5..46e7172 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1917,6 +1917,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) goto free_priv; }
+ /* vblank is reliable */ + dev->vblank_offdelay = 0; + /* overlay on gen2 is broken and can't address above 1G */ if (IS_GEN2(dev)) dma_set_coherent_mask(&dev->pdev->dev, DMA_BIT_MASK(30));