Re: [PATCH 6/7] drm/i915/skl: Update watermarks for Y tiling

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On Wed, Feb 25, 2015 at 10:34:19AM +0000, Tvrtko Ursulin wrote:
> >While this was what was documented at some point, it's not anymore.
> >Would need an extra patch before this one to introduce
> >plane_blocks_per_line and then this one on top.
> 
> Don't follow - what is plane_blocks_per_line and where and how would you add
> it before this patch?

It's all in the specs (the WM documentation has been updated last week).
plane_blocks_per_line has been introduced in the update. X and linear
tiling uses plane_blocks_per_line as well, so a patch that introduces it
before this patch would make sense.

FWIW, the spec update is to deal with Y tile underflow in some cases,
which sounds like something we want.

-- 
Damien
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