From mboxrd@z Thu Jan 1 00:00:00 1970 From: ville.syrjala@linux.intel.com (Ville =?iso-8859-1?Q?Syrj=E4l=E4?=) Date: Wed, 26 Sep 2018 19:37:23 +0300 Subject: [PATCH] DRM: VBLANK: provide valid timestamp for EVENT_FLIP In-Reply-To: <20180926142535.17997-1-Eugeniy.Paltsev@synopsys.com> References: <20180926142535.17997-1-Eugeniy.Paltsev@synopsys.com> List-ID: Message-ID: <20180926163723.GW9144@intel.com> To: linux-snps-arc@lists.infradead.org On Wed, Sep 26, 2018@05:25:35PM +0300, Eugeniy Paltsev wrote: > If driver/HW doesn't support vblank functionality (for example > UDL driver, ARCPGU driver, ...) we always have vblank->time == 0. > In result we always provide zero timestamp for > DRM_EVENT_FLIP_COMPLETE. This breaks userspace apps (for example > weston) which relies on timestamp value. > > Setup time to provide valid timestamp for DRM_EVENT_FLIP_COMPLETE > event. > > Cc: stable at vger.kernel.org > Signed-off-by: Eugeniy Paltsev > --- > drivers/gpu/drm/drm_vblank.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c > index 28cdcf76b6f9..0d19aca48782 100644 > --- a/drivers/gpu/drm/drm_vblank.c > +++ b/drivers/gpu/drm/drm_vblank.c > @@ -911,6 +911,15 @@ void drm_crtc_send_vblank_event(struct drm_crtc *crtc, > > if (dev->num_crtcs > 0) { If those drivers don't support vblank stuff why are they calling drm_vblank_init() w/ num_crtcs > 0? If they didn't they'd take the else branch which already does what you want. > seq = drm_vblank_count_and_time(dev, pipe, &now); > + > + /* > + * If driver/HW doesn't support vblank functionality we > + * always have vblank->time == 0. Setup time to provide valid > + * timestamp for DRM_EVENT_FLIP_COMPLETE event. > + */ > + if (!now && e->event.base.type == DRM_EVENT_FLIP_COMPLETE) > + now = ktime_get(); > + > } else { > seq = 0; > > -- > 2.14.4 > > _______________________________________________ > dri-devel mailing list > dri-devel at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Ville Syrj?l? Intel