On Tue, Oct 10, 2017 at 12:24:06PM +0300, Ville Syrjälä wrote: > On Tue, Oct 10, 2017 at 11:16:23AM +0200, Daniel Vetter wrote: > > On Mon, Oct 09, 2017 at 07:33:49PM +0300, Ville Syrjala wrote: > > > From: Ville Syrjälä <[email protected]> > > > > > > Asking for the initial vblank count by specifying and absolute vblank > > > count of 0 > > > doesn't make much sense. Switch to a relative query instead. > > > > > > Signed-off-by: Ville Syrjälä <[email protected]> > > > --- > > > tests/kms_setmode.c | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/tests/kms_setmode.c b/tests/kms_setmode.c > > > index 206d360607bb..ed5d97442255 100644 > > > --- a/tests/kms_setmode.c > > > +++ b/tests/kms_setmode.c > > > @@ -431,7 +431,7 @@ static void check_timings(int crtc_idx, const > > > drmModeModeInfo *kmode) > > > > > > memset(&wait, 0, sizeof(wait)); > > > wait.request.type = kmstest_get_vbl_flag(crtc_idx); > > > - wait.request.type |= DRM_VBLANK_ABSOLUTE | DRM_VBLANK_NEXTONMISS; > > > + wait.request.type |= DRM_VBLANK_RELATIVE | DRM_VBLANK_NEXTONMISS; > > > > Looking at drm_wait_vblank_is_query() in drm_vblank.c you also want to > > drop NEXTONMISS. > > Hmm. I think we may want to line things up to a vblank boundary here > (but I'd have to re-read the code to confirm that). Without the > NEXTONMISS we would just query the current count and continue > immediately. Alternative I guess we could drop the NEXTONMISS but > instead wait for seq+1.
NEXTONMISS means you don't actually query, but wait until that vblank happened (as a blocking ioctl, you only get the event when asking for it). I didn't really look into what the tests wants, just went with your description of what you want to do ... -Daniel > > > With that: > > > > Reviewed-by: Daniel Vetter <[email protected]> on both. > > > > Cheers, Daniel > > > do_or_die(drmWaitVBlank(drm_fd, &wait)); > > > > > > last_seq = wait.reply.sequence; > > > -- > > > 2.13.5 > > > > > > _______________________________________________ > > > Intel-gfx mailing list > > > [email protected] > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx > > > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > http://blog.ffwll.ch > > -- > Ville Syrjälä > Intel OTC -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
