On Sat, 18 Feb 2023 13:15:53 -0800
Rob Clark <robdclark@xxxxxxxxx> wrote:
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
>
> Will be used in the next commit to set a deadline on fences that an
> atomic update is waiting on.
>
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_vblank.c | 32 ++++++++++++++++++++++++++++++++
> include/drm/drm_vblank.h | 1 +
> 2 files changed, 33 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 2ff31717a3de..caf25ebb34c5 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -980,6 +980,38 @@ u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
> }
> EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
>
> +/**
> + * drm_crtc_next_vblank_time - calculate the time of the next vblank
> + * @crtc: the crtc for which to calculate next vblank time
> + * @vblanktime: pointer to time to receive the next vblank timestamp.
> + *
> + * Calculate the expected time of the next vblank based on time of previous
> + * vblank and frame duration
Hi,
for VRR this targets the highest frame rate possible for the current
VRR mode, right?
Thanks,
pq
> + */
> +int drm_crtc_next_vblank_time(struct drm_crtc *crtc, ktime_t *vblanktime)
> +{
> + unsigned int pipe = drm_crtc_index(crtc);
> + struct drm_vblank_crtc *vblank = &crtc->dev->vblank[pipe];
> + u64 count;
> +
> + if (!vblank->framedur_ns)
> + return -EINVAL;
> +
> + count = drm_vblank_count_and_time(crtc->dev, pipe, vblanktime);
> +
> + /*
> + * If we don't get a valid count, then we probably also don't
> + * have a valid time:
> + */
> + if (!count)
> + return -EINVAL;
> +
> + *vblanktime = ktime_add(*vblanktime, ns_to_ktime(vblank->framedur_ns));
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_crtc_next_vblank_time);
> +
> static void send_vblank_event(struct drm_device *dev,
> struct drm_pending_vblank_event *e,
> u64 seq, ktime_t now)
> diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
> index 733a3e2d1d10..a63bc2c92f3c 100644
> --- a/include/drm/drm_vblank.h
> +++ b/include/drm/drm_vblank.h
> @@ -230,6 +230,7 @@ bool drm_dev_has_vblank(const struct drm_device *dev);
> u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
> u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
> ktime_t *vblanktime);
> +int drm_crtc_next_vblank_time(struct drm_crtc *crtc, ktime_t *vblanktime);
> void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
> struct drm_pending_vblank_event *e);
> void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
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