linux-kernel - Re: GMA500 support

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Date:	Thu, 1 Dec 2011 21:29:10 +0100
From:	Kristoffer Ericson <kristoffer.ericson@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	patrik.r.jakobsson@...il.com, linux-kernel@...r.kernel.org,
	greg@...ah.com
Subject: Re: GMA500 support

On Wed, Nov 23, 2011 at 11:28:47AM +0000, Alan Cox wrote:
> On Mon, 21 Nov 2011 19:29:10 +0100
> Kristoffer Ericson <kristoffer.ericson@...il.com> wrote:
> 
> > Greetings,
> > 
> > Im syncing my gma500 tree to all the patches I see pass through the kernel mailinglist and
> > its progressing well. 
> > However, It would be nice with an todo list or a more practical this-works list. I know
> > its not a priority but would simplify alot for end users.
> 
> If you configure it in the following should work on GMA500/600
> - internal laptop displays including backlight
> - external svga
> - mode setting via KMS
> - framebuffer console
> - the framebuffer X server (and once out generally Dave Airlie's generic
>   KMS X server)
> - suspend/resume
> 
> The following I know don't work
> - Huge external displays so large they won't fit in 8MB at init time
>   (causes a crash)
> - Using the vesa X server with it - this confuses stuff and isn't
>   fixable, it's a "wrong user configuration"
> 
> Unsupported
> - 2D hardware acceleration except console scrolling (as it seems to be
>   too slow to be useful). I may add some 2D bits later where they do help
>   (eg back to front blitting may be worth it just about)
> - 3D engine (no public documentation)

I understand that the chip is powerv SGX 535, any likelyhood of
getting those datasheets opened by the company?

> - Video playback acceleration. In theory there is enough info in the
>   VAAPI code for GMA500/600 that has been published and in the old
>   'binary X/source kernel' driver to do this but someone will have to
>   work on it if they want it
> - Dell Mini HDMI port. This seems to be some kind of external bridge
>   chip. Being a TV luddite I don't yet own an HDMI capable display to
>   test.
> 
> And I'm sure we have a few bugs left !
> 
> Alan
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