From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
"Daniel Vetter" <daniel@ffwll.ch>,
"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: [PATCH v2 2/5] drm/vblank: Add helper to get next vblank time
Date: Sat, 7 Aug 2021 11:37:56 -0700 [thread overview]
Message-ID: <20210807183804.459850-3-robdclark@gmail.com> (raw)
In-Reply-To: <20210807183804.459850-1-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:[~2021-08-07 18:34 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-07 18:37 [PATCH v2 0/5] dma-fence: Deadline awareness Rob Clark
2021-08-07 18:37 ` [PATCH v2 1/5] dma-fence: Add deadline awareness Rob Clark
2021-08-16 10:15 ` Christian König
2021-08-07 18:37 ` Rob Clark [this message]
2021-08-07 18:37 ` [PATCH v2 3/5] drm/atomic-helper: Set fence deadline for vblank Rob Clark
2021-08-08 3:23 ` kernel test robot
2021-08-16 15:35 ` Daniel Vetter
2021-08-07 18:37 ` [PATCH v2 4/5] drm/scheduler: Add fence deadline support Rob Clark
2021-08-16 10:14 ` Christian König
2021-08-16 15:38 ` Daniel Vetter
2021-08-16 22:25 ` Rob Clark
2021-08-17 9:04 ` Daniel Vetter
2021-08-07 18:37 ` [PATCH v2 5/5] drm/msm: Add deadline based boost support Rob Clark
2021-08-16 10:16 ` [PATCH v2 0/5] dma-fence: Deadline awareness Christian König
2021-08-16 22:29 ` Rob Clark
2021-08-17 9:00 ` Christian König
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210807183804.459850-3-robdclark@gmail.com \
--to=robdclark@gmail.com \
--cc=airlied@linux.ie \
--cc=ckoenig.leichtzumerken@gmail.com \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=freedreno@lists.freedesktop.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mripard@kernel.org \
--cc=robdclark@chromium.org \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).