On 07/01/2015 04:46 PM, Daniel Vetter wrote: > On Wed, Jul 01, 2015 at 10:36:17AM +0200, Daniel Vetter wrote: >> On Wed, Jul 01, 2015 at 04:21:55PM +0800, Mark Zhang wrote: >>> This HACK adds a workqueue to refresh the display periodically. >>> This is used just for testing. >> >> ->dirty is the drm hook you're looking for, it's meant to flush out any >> frontbuffer rendering. Generic kms clients using the dumb buffers (e.g. >> fedora boot splash) use this already. >> >> And of course you need to upload a new frame every time an (atomic) flip >> happens too, but I guess you have that already. No need at all for a >> periodic upload hack like this. > > btw the nice thing with dirty is that it hands you the exact invalidation > rectangle, which means you can minimize uploads. For atomic flips we plan > to have the same, but it's not implemented yet. > > Another problem is that currently the fbdev helper in drm_fb_helper.c > doesn't support the dirty callback. But there's other drivers which need > this too (e.g. i915 will gain a dirty callback soon) and qxl has all the > code implemented already. So the only thing you need to do is move the qxl > code into drm_fb_helper.c and adapt it to use the dirty callback instead > of directly calling qxl code. Then you should be all set. Note that simply > calling ->dirty from fbdev hooks doesn't work since a lot of those hooks > are called from irq context (cursors and stuff) and hence you need a > workqueue to do the actual dirty call. > I got it. So this is the kernel part I need. Thanks. Mark > Cheers, 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
