On Tue, Apr 7, 2015 at 2:56 PM, Gerd Hoffmann <kraxel at redhat.com> 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20150407/5f4015c3/attachment.html>
