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{ "id": 15425, "url": "https://patchwork.libcamera.org/api/covers/15425/?format=api", "web_url": "https://patchwork.libcamera.org/cover/15425/", "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": "<20220307124633.115452-1-naush@raspberrypi.com>", "date": "2022-03-07T12:46:27", "name": "[libcamera-devel,v1,0/6] Raspberry Pi: Efficient start/stop/start sequences", "submitter": { "id": 97, "url": "https://patchwork.libcamera.org/api/people/97/?format=api", "name": "Nicolas Dufresne via libcamera-devel", "email": "libcamera-devel@lists.libcamera.org" }, "mbox": "https://patchwork.libcamera.org/cover/15425/mbox/", "series": [ { "id": 2954, "url": "https://patchwork.libcamera.org/api/series/2954/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2954", "date": "2022-03-07T12:46:27", "name": "Raspberry Pi: Efficient start/stop/start sequences", "version": 1, "mbox": "https://patchwork.libcamera.org/series/2954/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/covers/15425/comments/", "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 CCC4EBF415\n\tfor <parsemail@patchwork.libcamera.org>;\n\tMon, 7 Mar 2022 12:46:41 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id DC75461184;\n\tMon, 7 Mar 2022 13:46:40 +0100 (CET)", "from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com\n\t[IPv6:2a00:1450:4864:20::42c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1CA6A604EC\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 7 Mar 2022 13:46:39 +0100 (CET)", "by mail-wr1-x42c.google.com with SMTP id n15so8963340wra.6\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tMon, 07 Mar 2022 04:46:39 -0800 (PST)", "from naush-laptop.pitowers.org\n\t([2a00:1098:3142:14:c644:e9b3:de0b:54c5])\n\tby smtp.gmail.com with ESMTPSA id\n\tz6-20020a1cf406000000b0037c4e2d3baesm19759582wma.19.2022.03.07.04.46.37\n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tMon, 07 Mar 2022 04:46:37 -0800 (PST)" ], "DKIM-Signature": [ "v=1; 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\n\tMon, 07 Mar 2022 04:46:38 -0800 (PST)", "To": "libcamera-devel@lists.libcamera.org", "Date": "Mon, 7 Mar 2022 12:46:27 +0000", "Message-Id": "<20220307124633.115452-1-naush@raspberrypi.com>", "X-Mailer": "git-send-email 2.25.1", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH v1 0/6] Raspberry Pi: Efficient\n\tstart/stop/start sequences", "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": "Hi,\n\nThis series addresses a problem with the existing Raspberry Pi pipeline handler,\nwere we do not efficiently handle a camera start/stop/restart sequence. This is\nbecause we de-allocate and re-allocate buffers on stop and start respectively.\nHowever, since no camera configure has occurred, the re-allocation is unnecessary.\n\nThis series attempts to fix this by not de-allocating buffers on a stop, and\nonly re-allocating on start if a configure has been called in-between. We also\nfix a small bug in the V4L2 buffer cache, which does not clear state on a stop\nin all circumstances.\n\nThanks,\nNaush\n\nNaushir Patuck (6):\n pipeline: raspberrypi: Avoid over-allocation for ISP Output 1\n pipeline: raspberrypi: Move freeBuffers() to the RPiCameraData class\n pipeline: raspberrypi: Free buffers in the RPiCamera destructor and\n re-configure\n pipeline: raspberrypi: Add a reconfigured flag\n pipeline: raspberrypi: Repurpose RPi::Stream::reset()\n libcamera: v4l2_videodevice: Empty the V4L2 buffer cache on\n streamOff()\n\n include/libcamera/internal/v4l2_videodevice.h | 1 +\n .../pipeline/raspberrypi/raspberrypi.cpp | 54 ++++++++++++-------\n .../pipeline/raspberrypi/rpi_stream.cpp | 11 ++--\n src/libcamera/v4l2_videodevice.cpp | 16 ++++++\n 4 files changed, 56 insertions(+), 26 deletions(-)" }