On Tue, Apr 7, 2015 at 2:56 PM, Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
On Do, 2015-04-02 at 09:57 +0800, John Hunter wrote:
> Hi Daniel,
> Sorry to disturb you, I realized you are a busy man of the community.
> So I did some work before I email you.
>
>
> I submit my proposal as you suggest, convert the two virtual driver
> (CIRRUS
> and BOCHS, if I remember it right) to atomic mode-setting.
>
>
> After talked with Martin Peres(the administrator of xorg on gsoc) and
> Gerd Hoffmann (the author of VirtIO gpu driver), we got this question,
> is CIRRUS suitable to convert, as qemu using cirrus considered
> harmful.
Short background summary on the later for everybody involved:
cirrus emulates hardware from the 90ies which simply isn't up to todays
needs. The two major issues:
* It has very limited video memory. The cirrus driver does swap
framebuffers in and out of video memory because of that. I suspect
converting the driver to atomic modesetting will be either impossible
or at least pretty difficult because of that. The limited video
memory also limits the available resolutions, cirrus can't do FullHD
for example.
I think at least I should give it a try. If it is really impossible to convert, then
we should talk about whether we should deprecate it in the future.
And I hope to treat cirrus as an test filed, it's a easier driver, so I can get into
the drm kernel hacking quickly.
* cirrus can run 1024x768 only at 24bpp (not 32bpp). Which is rather
unusual these days and cirrus has display issues in xorg because it
takes code paths which are not really maintained & tested any more.
cirrus isn't the default vga any more in qemu version 2.2 & newer
because of these problems.
cheers,
Gerd
Best regards
Junwang Zhao
Microprocessor Research and Develop Center
Department of Computer Science &Technology
Peking University
Beijing, 100871, PRC
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