linux-kernel - Re: [PATCH 4/5] drm/i915: Add async page flip support for IVB

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Date:	Wed, 24 Jul 2013 13:26:32 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 4/5] drm/i915: Add async page flip support for IVB

Daniel Vetter <daniel@...ll.ch> writes:

> Matching tiling modes is actually already a requirement on gen4+ (since
> the tiling bit and the linear/tiled offset registers can't be changed with
> a MI_DISPLAY_FLIP command).

Async flip has a harder requirement -- you must use X tiling, both
before and after the flip. Oh, and async flips require a 32KB aligned
buffer, which I'm not actually checking for. Not sure how to

> But atm we fail to check that in the common
> code, so imo better to move that to there.
>
> We already check for matching strides in common code, so with the tile
> check added we could drop this all here.

I don't see a requirement for matching stride and tile parameter in the
MI_DISPLAY_FLIP docs for synchronous operations, at least on DevGT+. Is
the common code too restrictive?

-- 
keith.packard@...el.com

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