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[73.67.135.195]) by smtp.gmail.com with ESMTPSA id s26-20020aa78d5a000000b0058dbb5c5038sm4957450pfe.182.2023.02.18.13.16.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Feb 2023 13:16:01 -0800 (PST) From: Rob Clark To: dri-devel@lists.freedesktop.org Subject: [PATCH v4 10/14] drm/vblank: Add helper to get next vblank time Date: Sat, 18 Feb 2023 13:15:53 -0800 Message-Id: <20230218211608.1630586-11-robdclark@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230218211608.1630586-1-robdclark@gmail.com> References: <20230218211608.1630586-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Clark , Thomas Zimmermann , Tvrtko Ursulin , =?UTF-8?q?Christian=20K=C3=B6nig?= , =?UTF-8?q?Michel=20D=C3=A4nzer?= , open list , Pekka Paalanen , Rodrigo Vivi , Alex Deucher , freedreno@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark 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 --- 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 + */ +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, -- 2.39.1