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Date:	Mon, 10 Mar 2014 11:07:36 +0100
From:	Daniel Vetter <>
To:	Chris Wilson <>,
	Daniel Vetter <>,
	Sagar Arun Kamble <>,
	Alex Deucher <>,
	Intel Graphics Development <>,
	LKML <>,
	Maling list - DRI developers 
Subject: Re: [Intel-gfx] [PATCH v3 1/1] drm/i915: Enabling 128x128 and 256x256
 ARGB Cursor Support

On Mon, Mar 10, 2014 at 11:04 AM, Chris Wilson <> wrote:
>> > 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...

1. Move cursor off-screen.
2. Check desired cursor layout with set_cursor.
3. Pick real cursor, set it.


1. Use set_cursor on disabled crtc.

Both aren't pretty, but that ugly should help to move
cursors-as-real-planes forward ;-)
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 -
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