On 21 June 2016 at 15:19, Daniel Vetter <daniel@xxxxxxxx> wrote: > On Tue, Jun 21, 2016 at 3:32 AM, Xinliang Liu <xinliang.liu@xxxxxxxxxx> wrote: >> My understanding is that drm_crtc_arm_vblank_event work together with >> drm_crtc_handle_vblank (called in vblank interrupt). >> Arm the event first in somewhere(like atomic_begin/flush) and then >> send it out throuth drm_crtc_handle_vblank in vblank interrupt. >> In the other way, drm_crtc_send_vblank_event work together with flip >> interrupt. That's means event will be sent in flip interrupt >> immediately. >> Is this right? > > First part is right. Second part about drm_crtc_send_vblank event just > sends out the vblank directly (using the last recorded vblank). The > vblank subsystem doesn't itself interact with any interrupt. > > Note that there's kerneldoc for all of this. Please make sure it does > describe things sufficiently well, and if not please send in patches > to improve them. Ok, I will take a look at the doc. Thanks, -xinliang > -Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
