From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org
Cc: "Daniel Vetter" <daniel@ffwll.ch>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
"Michel Dänzer" <michel@daenzer.net>,
"Pekka Paalanen" <ppaalanen@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: [PATCH v3 2/9] drm/vblank: Add helper to get next vblank time
Date: Fri, 3 Sep 2021 11:47:53 -0700 [thread overview]
Message-ID: <20210903184806.1680887-3-robdclark@gmail.com> (raw)
In-Reply-To: <20210903184806.1680887-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
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 b701cda86d0c..ec2732664b95 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
+ */
+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,
--
2.31.1
next prev parent reply other threads:[~2021-09-03 18:44 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 18:47 [PATCH v3 0/9] dma-fence: Deadline awareness Rob Clark
2021-09-03 18:47 ` [PATCH v3 1/9] dma-fence: Add deadline awareness Rob Clark
2021-09-08 17:55 ` Daniel Vetter
2021-09-03 18:47 ` Rob Clark [this message]
2021-09-03 18:47 ` [PATCH v3 3/9] drm/atomic-helper: Set fence deadline for vblank Rob Clark
2021-09-03 18:47 ` [PATCH v3 4/9] drm/scheduler: Add fence deadline support Rob Clark
2021-09-08 17:45 ` Daniel Vetter
2021-09-09 6:22 ` Christian König
2021-09-14 13:38 ` Daniel Vetter
2021-09-21 15:57 ` Rob Clark
2021-09-21 16:35 ` Rob Clark
2021-09-21 16:45 ` Christian König
2021-09-21 20:09 ` Andrey Grodzovsky
2021-09-21 20:47 ` Rob Clark
2021-09-22 2:18 ` Andrey Grodzovsky
2021-09-22 3:32 ` Rob Clark
2021-09-22 14:31 ` Andrey Grodzovsky
2021-09-22 15:01 ` Rob Clark
2021-09-03 18:47 ` [PATCH v3 5/9] drm/msm: Add deadline based boost support Rob Clark
2021-09-08 17:48 ` Daniel Vetter
2021-09-08 17:57 ` Rob Clark
2021-09-03 18:47 ` [PATCH v3 6/9] dma-buf/fence-array: Add fence deadline support Rob Clark
2021-09-08 18:00 ` Daniel Vetter
2021-09-09 6:55 ` Christian König
2021-09-03 18:47 ` [PATCH v3 7/9] dma-buf/fence-chain: " Rob Clark
2021-09-08 17:54 ` Daniel Vetter
2021-09-08 18:19 ` Rob Clark
2021-09-08 18:45 ` Daniel Vetter
2021-09-09 6:31 ` Christian König
2021-09-03 18:47 ` [PATCH v3 8/9] dma-buf/sync_file: Add SET_DEADLINE ioctl Rob Clark
2021-09-08 17:50 ` Daniel Vetter
2021-09-08 18:23 ` Rob Clark
2021-09-08 18:49 ` Daniel Vetter
2021-09-08 19:40 ` Rob Clark
2021-09-08 21:10 ` Daniel Vetter
2021-09-21 18:08 ` Rob Clark
2021-09-27 8:42 ` Pekka Paalanen
2021-09-27 8:53 ` Christian König
2021-09-27 14:36 ` Rob Clark
2021-09-28 7:57 ` Pekka Paalanen
2021-09-03 18:48 ` [PATCH v3 9/9] dma-buf/sw_sync: Add fence deadline support Rob Clark
2021-09-09 16:16 ` [PATCH v3 0/9] dma-fence: Deadline awareness Simon Ser
2021-09-09 16:35 ` Rob Clark
2021-09-09 16:42 ` Simon Ser
2021-09-09 17:08 ` Rob Clark
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