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{ "id": 15581, "url": "https://patchwork.libcamera.org/api/patches/15581/?format=api", "web_url": "https://patchwork.libcamera.org/patch/15581/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20220329112929.465434-1-naush@raspberrypi.com>", "date": "2022-03-29T11:29:27", "name": "[libcamera-devel,v3,1/3] libcamera: v4l2_videodevice: Add a dequeue timer", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "f32c0b9787c668c16947a49bad7839c149b8ce1e", "submitter": { "id": 34, "url": "https://patchwork.libcamera.org/api/people/34/?format=api", "name": "Naushir Patuck", "email": "naush@raspberrypi.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/15581/mbox/", "series": [ { "id": 3012, "url": "https://patchwork.libcamera.org/api/series/3012/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3012", "date": "2022-03-29T11:29:27", "name": "[libcamera-devel,v3,1/3] libcamera: v4l2_videodevice: Add a dequeue timer", "version": 3, "mbox": "https://patchwork.libcamera.org/series/3012/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/15581/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/15581/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 95D45C0F1B\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 29 Mar 2022 11:29:37 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 120B7604C5;\n\tTue, 29 Mar 2022 13:29:37 +0200 (CEST)", "from mail-wr1-x430.google.com (mail-wr1-x430.google.com\n\t[IPv6:2a00:1450:4864:20::430])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 873B660135\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 29 Mar 2022 13:29:34 +0200 (CEST)", "by mail-wr1-x430.google.com with SMTP id a1so24319278wrh.10\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 29 Mar 2022 04:29:34 -0700 (PDT)", "from naush-laptop.pitowers.org\n\t([2a00:1098:3142:14:e34f:94fd:5684:9ead])\n\tby smtp.gmail.com with ESMTPSA id\n\tbi20-20020a05600c3d9400b0038cfe80eeddsm1767436wmb.29.2022.03.29.04.29.33\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tTue, 29 Mar 2022 04:29:33 -0700 (PDT)" ], "DKIM-Signature": [ "v=1; 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dkim=pass (2048-bit key; \n\tunprotected) header.d=raspberrypi.com\n\theader.i=@raspberrypi.com\n\theader.b=\"lvx60xc/\"; dkim-atps=neutral", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20210112;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version\n\t:content-transfer-encoding;\n\tbh=jiUiaj6V+PO+r77ClBHn0L2Fm0x8rUqAAlSGuT11Qck=;\n\tb=SPxkuVSVjzVXf4CIiqW5CI8ieivejqtJgZu9Xdc+aFPEgPXoNx6Wp0SwcwZPdMQZUQ\n\t+GeNAu8jlnBMsmVyVuXZsn59gMUFXEBiybRUW7g3gfeHMVkslkAB+AKYm5lXPgv3O1QK\n\ty5ooZgiHX/tHnt57aESVW1S2Bja8iyVjxgZMEV2fXeFSp6cALZACjEXghLiL5nNWa+v9\n\t9JRP+NDEK2jeN64b6sNLT9HP50rzY1O7pM1IaRbucVhUUF8cUYKveXHqBEPAOnHwfQkk\n\tcJ50+VZyk9D0MAGeIAAQJ4yRNUgunLmHAFngNoQQ1khD3/lxLUucahUZ7G4nb6fwdrvb\n\tZ0nA==", "X-Gm-Message-State": "AOAM533J2O1qb2U9RzIIUvNNa6D0Sup9DARerMaxR7B196yzjxOUs8tx\n\tjtF1Jk5TW8NYWcHlxd1OiIr3pw+TiFMLGQ==", "X-Google-Smtp-Source": "ABdhPJzifXkajhG4BNv8VZ8l3LuXz5bWP3ixDtZ6fACGNXoaikyk/QR+TTJtwvNASAYqFKD+53EVKA==", "X-Received": "by 2002:a5d:65c5:0:b0:203:dcc9:546c with SMTP id\n\te5-20020a5d65c5000000b00203dcc9546cmr30525020wrw.130.1648553373913; \n\tTue, 29 Mar 2022 04:29:33 -0700 (PDT)", "To": "libcamera-devel@lists.libcamera.org", "Date": "Tue, 29 Mar 2022 12:29:27 +0100", "Message-Id": "<20220329112929.465434-1-naush@raspberrypi.com>", "X-Mailer": "git-send-email 2.25.1", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v3 1/3] libcamera: v4l2_videodevice: Add a\n\tdequeue timer", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "From": "Naushir Patuck via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>", "Reply-To": "Naushir Patuck <naush@raspberrypi.com>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Add a timer that gets reset on every buffer dequeue event. If the timeout\nexpires, optionally call a slot in the pipeline handler to handle this\ncondition. This may be useful in detecting and handling stalls in either the\nhardware or device driver.\n\nSigned-off-by: Naushir Patuck <naush@raspberrypi.com>\n---\n include/libcamera/internal/v4l2_videodevice.h | 10 ++++\n src/libcamera/v4l2_videodevice.cpp | 54 +++++++++++++++++++\n 2 files changed, 64 insertions(+)", "diff": "diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h\nindex cfeae7bd6c52..2a9ba1fe5c71 100644\n--- a/include/libcamera/internal/v4l2_videodevice.h\n+++ b/include/libcamera/internal/v4l2_videodevice.h\n@@ -9,6 +9,7 @@\n \n #include <array>\n #include <atomic>\n+#include <chrono>\n #include <memory>\n #include <optional>\n #include <stdint.h>\n@@ -20,6 +21,7 @@\n #include <libcamera/base/class.h>\n #include <libcamera/base/log.h>\n #include <libcamera/base/signal.h>\n+#include <libcamera/base/timer.h>\n #include <libcamera/base/unique_fd.h>\n \n #include <libcamera/color_space.h>\n@@ -217,6 +219,9 @@ public:\n \tint streamOn();\n \tint streamOff();\n \n+\tvoid setDequeueTimeout(std::chrono::milliseconds msec);\n+\tSignal<> dequeueTimeout;\n+\n \tstatic std::unique_ptr<V4L2VideoDevice>\n \tfromEntityName(const MediaDevice *media, const std::string &entity);\n \n@@ -253,6 +258,8 @@ private:\n \tvoid bufferAvailable();\n \tFrameBuffer *dequeueBuffer();\n \n+\tvoid watchdogExpired();\n+\n \tV4L2Capability caps_;\n \tV4L2DeviceFormat format_;\n \tconst PixelFormatInfo *formatInfo_;\n@@ -266,6 +273,9 @@ private:\n \tEventNotifier *fdBufferNotifier_;\n \n \tState state_;\n+\n+\tTimer watchdog_;\n+\tstd::chrono::milliseconds watchdogDuration_;\n };\n \n class V4L2M2MDevice\ndiff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp\nindex 009f6d55610f..22191cb9de4d 100644\n--- a/src/libcamera/v4l2_videodevice.cpp\n+++ b/src/libcamera/v4l2_videodevice.cpp\n@@ -539,6 +539,7 @@ V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode)\n V4L2VideoDevice::V4L2VideoDevice(const MediaEntity *entity)\n \t: V4L2VideoDevice(entity->deviceNode())\n {\n+\twatchdog_.timeout.connect(this, &V4L2VideoDevice::watchdogExpired);\n }\n \n V4L2VideoDevice::~V4L2VideoDevice()\n@@ -1723,6 +1724,9 @@ FrameBuffer *V4L2VideoDevice::dequeueBuffer()\n \t\treturn nullptr;\n \t}\n \n+\tif (watchdogDuration_.count())\n+\t\twatchdog_.start(watchdogDuration_);\n+\n \tcache_->put(buf.index);\n \n \tFrameBuffer *buffer = it->second;\n@@ -1825,6 +1829,8 @@ int V4L2VideoDevice::streamOn()\n \t}\n \n \tstate_ = State::Streaming;\n+\tif (watchdogDuration_.count())\n+\t\twatchdog_.start(watchdogDuration_);\n \n \treturn 0;\n }\n@@ -1849,6 +1855,9 @@ int V4L2VideoDevice::streamOff()\n \tif (state_ != State::Streaming && queuedBuffers_.empty())\n \t\treturn 0;\n \n+\tif (watchdogDuration_.count())\n+\t\twatchdog_.stop();\n+\n \tret = ioctl(VIDIOC_STREAMOFF, &bufferType_);\n \tif (ret < 0) {\n \t\tLOG(V4L2, Error)\n@@ -1876,6 +1885,51 @@ int V4L2VideoDevice::streamOff()\n \treturn 0;\n }\n \n+/**\n+ * \\brief Set the dequeue timeout value\n+ * \\param[in] msec The timeout value to be used\n+ *\n+ * Sets a timeout value, given by \\a msec, that will be used by a watchdog timer\n+ * to ensure buffer dequeue events are periodically occurring when the device is\n+ * streaming. The watchdog timer is only active when the device is streaming, so\n+ * it is not necessary to disable it when the device stops streaming. The timeout\n+ * value can be safely updated at any time.\n+ *\n+ * If the timer expires, the \\ref V4L2VideoDevice::dequeueTimeout signal is\n+ * emitted. This can typically be used by pipeline handlers to be notified of\n+ * stalled devices.\n+ *\n+ * Set \\a msec to 0 to disable the watchdog timer.\n+ */\n+void V4L2VideoDevice::setDequeueTimeout(std::chrono::milliseconds msec)\n+{\n+\twatchdogDuration_ = msec;\n+\n+\twatchdog_.stop();\n+\tif (watchdogDuration_.count() && state_ == State::Streaming)\n+\t\twatchdog_.start(msec);\n+}\n+\n+/**\n+ * \\var V4L2VideoDevice::dequeueTimeout\n+ * \\brief A Signal emitted when the dequeue watchdog timer expires\n+ */\n+\n+/**\n+ * \\brief Slot to handle an expired dequeue timer.\n+ *\n+ * When this slot is called, the time between successive dequeue events is over\n+ * the required timeout. Emit the \\ref V4L2VideoDevice::dequeueTimeout signal.\n+ */\n+void V4L2VideoDevice::watchdogExpired()\n+{\n+\tLOG(V4L2, Warning)\n+\t\t<< \"Dequeue timer of \" << watchdogDuration_.count()\n+\t\t<< \" ms has expired!\";\n+\n+\tdequeueTimeout.emit();\n+}\n+\n /**\n * \\brief Create a new video device instance from \\a entity in media device\n * \\a media\n", "prefixes": [ "libcamera-devel", "v3", "1/3" ] }