[Intel-gfx] [PATCH v2 3/5] drm/i915: Skip the execlists CSB scan and rewrite if the ring is untouched

[Chris Wilson]

On Mon, Jan 23, 2017 at 12:14:27PM +0000, Chris Wilson wrote:
> If the CSB head/tail pointers are unchanged, we can skip the update of
> the CSB register afterwards.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

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Chris Wilson, Intel Open Source Technology Centre