From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: "Daniel Vetter" <daniel@ffwll.ch>,
"Matthew Brost" <matthew.brost@intel.com>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
"Rob Clark" <robdclark@chromium.org>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@linux.ie>,
linux-kernel@vger.kernel.org (open list)
Subject: [RFC 2/4] drm/vblank: Add helper to get next vblank time
Date: Mon, 26 Jul 2021 16:38:49 -0700 [thread overview]
Message-ID: <20210726233854.2453899-3-robdclark@gmail.com> (raw)
In-Reply-To: <20210726233854.2453899-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/drm_vblank.c | 31 +++++++++++++++++++++++++++++++
include/drm/drm_vblank.h | 1 +
2 files changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 3417e1ac7918..88c824c294dc 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -980,6 +980,37 @@ 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
+ */
+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;
+}
+
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,
--
2.31.1
next prev parent reply other threads:[~2021-07-26 23:34 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 23:38 [RFC 0/4] dma-fence: Deadline awareness Rob Clark
2021-07-26 23:38 ` [RFC 1/4] dma-fence: Add deadline awareness Rob Clark
2021-07-27 7:11 ` Christian König
2021-07-27 14:25 ` Rob Clark
2021-07-28 7:03 ` Christian König
2021-07-28 11:37 ` Christian König
2021-07-28 15:15 ` Rob Clark
2021-07-28 17:23 ` Christian König
2021-07-28 17:58 ` Rob Clark
2021-07-29 7:03 ` Daniel Vetter
2021-07-29 15:23 ` Rob Clark
2021-07-29 16:18 ` Daniel Vetter
2021-07-29 17:32 ` Rob Clark
2021-07-26 23:38 ` Rob Clark [this message]
2021-07-26 23:38 ` [RFC 3/4] drm/atomic-helper: Set fence deadline for vblank Rob Clark
2021-07-27 10:44 ` Michel Dänzer
2021-07-27 14:33 ` Rob Clark
2021-07-26 23:38 ` [RFC 4/4] drm/scheduler: Add fence deadline support Rob Clark
2021-07-26 23:51 ` [RFC 0/4] dma-fence: Deadline awareness Rob Clark
2021-07-27 14:41 ` Michel Dänzer
2021-07-27 15:12 ` Rob Clark
2021-07-27 15:19 ` Michel Dänzer
2021-07-27 15:37 ` Rob Clark
2021-07-28 11:36 ` Christian König
2021-07-28 13:08 ` Michel Dänzer
2021-07-28 13:13 ` Christian König
2021-07-28 13:24 ` Michel Dänzer
2021-07-28 13:31 ` Christian König
2021-07-28 13:57 ` Pekka Paalanen
2021-07-28 14:30 ` Christian König
2021-07-29 8:08 ` Michel Dänzer
2021-07-29 8:23 ` Pekka Paalanen
2021-07-29 8:43 ` Christian König
2021-07-29 9:15 ` Pekka Paalanen
2021-07-29 10:14 ` Christian König
2021-07-29 10:28 ` Michel Dänzer
2021-07-29 11:00 ` Pekka Paalanen
2021-07-29 11:43 ` Christian König
2021-07-29 12:49 ` Pekka Paalanen
2021-07-29 13:41 ` Christian König
2021-07-29 14:10 ` Pekka Paalanen
2021-07-28 15:27 ` Rob Clark
2021-07-28 17:20 ` Christian König
2021-07-28 15:34 ` Rob Clark
2021-07-29 7:09 ` Daniel Vetter
2021-07-29 8:17 ` Michel Dänzer
2021-07-29 9:03 ` Daniel Vetter
2021-07-29 9:37 ` Pekka Paalanen
2021-07-29 12:18 ` Daniel Vetter
2021-07-29 12:59 ` Pekka Paalanen
2021-07-29 14:05 ` Daniel Vetter
2021-07-27 21:17 ` [RFC 5/4] drm/msm: Add deadline based boost support Rob Clark
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