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. - 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? Mark > -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
