On Wed, Apr 2, 2014 at 5:52 AM, Archit Taneja archit@ti.com wrote:
Hi,
I was trying to figure out how we are supposed to manage synchronization between a mode_set and a page_flip called on a crtc.
Say, if a mode_set is immediately followed by a page_flip. The driver can't process the page_flip straight away since the hardware is still completing the mode_set.
I guess setcrtc is expected to be synchronous(ish).. so a lot of userspace won't expect the first pageflip to fail with -EBUSY.
BR, -R
What is the driver supposed to do? Should it return -EBUSY? Or should it somehow queue the page_flip task internally?
A lot of libdrm applications seem to call mode_set, and call a page_flip soon after it. They tend to bail out if page_flip returns an error, they don't try to do another page_flip if it fails the first time. Is this okay behaviour?
Thanks, Archit _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel