linux-kernel - Re: [RFC] enhancing the kernel's graphics subsystem

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Message-Id: <200705210934.58559.jbarnes@virtuousgeek.org>
Date:	Mon, 21 May 2007 09:34:58 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Jon Smirl" <jonsmirl@...il.com>
Cc:	"Jon Smirl" <jonsmirl@...il.net>,
	"Jesse Barnes" <jesse.barnes@...el.com>,
	linux-kernel@...r.kernel.org,
	"Antonino A. Daplas" <adaplas@...il.com>
Subject: Re: [RFC] enhancing the kernel's graphics subsystem

On Monday, May 21, 2007, Jesse Barnes wrote:
> > There is more to fbdev than mode setting. It is also how non-x86
> > platforms achieve their boot display. How will boot display be handled
> > with the your design? What about console display on non-x86 platforms?
> > Loading both fbdev and the new code puts us right back into the
> > multiple driver fight we have today.
>
> Maybe you should take a look at the patches. :)  The code I posted
> actually creates an fb device as a slave of the DRM device, and uses
> that for the boot console.  Once you've booted, you can use the new
> interfaces to do whatever you want with the graphics device... though it
> doesn't create /dev/fb* devices per-CRTC like you seem to want, it's
> really easy to do the equivalent with a small userspace program (though
> I haven't actually tested sharing of buffer objects, it should work).

Actually, scratch that last bit.  I forgot about a recent change alanh 
committed that did just that:  per-CRTC FB devices.  So please take a 
close look (modesetting-101 of mesa/drm git at freedesktop.org) and let me 
know if you see any gaping holes.

Thanks,
Jesse
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