Oh.. understood. Thanks. Mark On 07/03/2015 04:03 PM, Daniel Vetter wrote: > On Fri, Jul 03, 2015 at 03:57:55PM +0800, Mark Zhang wrote: >> On 07/01/2015 10:55 PM, Daniel Vetter wrote: >>> On Wed, Jul 01, 2015 at 08:43:01PM +0800, Mark Zhang wrote: >>>> On 07/01/2015 06:34 PM, Daniel Vetter wrote: >> [...] >>>>> >>>> >>>> Alright, this makes sense. I have no idea about qxl, what I have now is >>>> an ubuntu running on Tegra114. So I'm wondering what I suppose to do is >>>> installing qemu on the ubuntu? >>> >>> My suggestion is just to take the qxl code, move it to the fbdev emulation >>> helper, make it generic and use it. If you want you can do a >>> compile-tested patch on top to switch qxl over to the newly added helpers. >>> No need to install/run qxl itself. Just that qxl seems to have the most >>> complete solution for what you need. >> >> OK, thanks Daniel. I'm not quite familiar with the userspace, but I >> think this is the summary: >> >> - For legacy FB support, we can use the "->dirty" fops, port the qxl >> codes to drm_fb_helper.c, just as you described. > > Note that this is for legacy frontbuffer rendering only. All other screen > updates (setplane, setcrtc, pageflip) will go through the atomic flip > path, thanks to all the atomic helpers. > >> - For atomic page flip, the one-shot can be triggered when flipping the >> window/plane. >> - How about the front buffer rendering/drawing? I mean, if a drm >> userspace app requests a dumb buffer then draws on it, how can we >> trigger the one-shot to update the display? Do we need to add an >> additional IOCTL to do that? > > dumb buffer userspace is required to call dirtyfb ioctl. > -Daniel > -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
