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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


  parent reply	other threads:[~2021-08-07 18:34 UTC|newest]

Thread overview: 15+ 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
2021-08-16 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

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