linux-kernel - Re: [Intel-gfx] [PATCH v3 1/1] drm/i915: Enabling 128x128 and 256x256 ARGB Cursor Support

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Date:	Mon, 10 Mar 2014 10:04:25 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Sagar Arun Kamble <sagar.a.kamble@...el.com>,
	Alex Deucher <alexdeucher@...il.com>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [PATCH v3 1/1] drm/i915: Enabling 128x128 and
 256x256 ARGB Cursor Support

On Mon, Mar 10, 2014 at 10:55:40AM +0100, Daniel Vetter wrote:
> On Mon, Mar 10, 2014 at 10:29 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> >> Realized after sending mail that we just get to know current cursor
> >> width and height. Can we have capability that exposes all supported
> >> cursor sizes?
> >
> > The cap exposes the max cursor size. Knowing our hardware we can infer
> > that pot sizes from 64 to max are supported, but it would be better if
> > we did expose that information through the cap as well.
> 
> I think the right approach here is to expose this through the
> cursor-as-real-plane interface, which kinda has this already. On top
> of that we can then add a few fourcc enumerations of the fixed rgba
> cursor layouts like 64x64, 128x128, ... This helps if the plane is a
> general one with very high limits, but also with special support for
> cursor formats.
> 
> If anyone wants to go crazy we could then also add new fourccs for all
> the other cursor layouts - atm only rgba with fixed dimensions can be
> support with the current cursor ioctl.
> 
> So reviewing the overall situation I actually _don't_ want a new
> cap/ioctl/prop here just for now. As long as we need to go with intel
> specific hacks userspace might as well probe things manually and act
> upon the -EINVAL.

Adding the cap allows existing userspace to dtrt...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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