Re: [PATCH v2 3/3] drm/i915: Prevent MI_DISPLAY_FLIP straddling two cachelines on IVB

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On Tue, Feb 11, 2014 at 03:55:50PM +0200, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> 
> According to BSpec the entire MI_DISPLAY_FLIP packet must be contained
> in a single cacheline. Make sure that happens.
> 
> v2: Use intel_ring_begin_cacheline_safe()

Ugh, no. Let's not make intel_ring_begin() any more complicated and just
introduce a function to align the current head in the ringbuffer to a
cacheline. Especially with such an interface that is hard to get right.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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