On Wed, Sep 26, 2018 at 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 <Eugeniy.Paltsev at synopsys.com>
> ---
> 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
>
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