From patchwork Wed Mar 8 22:45:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 66491 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:5915:0:0:0:0:0 with SMTP id v21csp622041wrd; Wed, 8 Mar 2023 15:00:54 -0800 (PST) X-Google-Smtp-Source: AK7set9CZ+Krmp3UL+g/FUbC3UikoOYVjJLIoDw3RzZhV/fZ/4g4+r2Anpe4d+uNhwiRzX7VaT0I X-Received: by 2002:a17:903:2452:b0:19d:1c6e:d31e with SMTP id l18-20020a170903245200b0019d1c6ed31emr21058693pls.60.1678316454562; Wed, 08 Mar 2023 15:00:54 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1678316454; cv=none; d=google.com; s=arc-20160816; b=NVSV+6EmNWJqwNTz3+mH7M4+wjRXz7+RwQ5Cm7ffQGEsQo+4RCf6TF/qB7l7YvAgkZ uY6ykPi6mEPA43dUMF9eOsF6fJttIj77N7SV3TLarFr8f/ZKp/HDlqOaDbfZMQ/Mis+m oq61OyGc4tMaQL79nysAOejuNyFnYk3rzBmfBQM30Iq+jBixVXh+B6rbXdI1QbOkevQR ytyvOZUzlyrFVEyDJk2jZLXEx/RGS8V0e8NYQ9Uc4MAZPaC2PgmRrsPvzLMcfaJ6mqcC FZADb/HFuEdsVG90z8K5WAUeIb2qi9ftVwn9jUm1syocIkvqM/dtQenQwXriHrAyEOsX 7CHA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:in-reply-to:references:message-id :content-transfer-encoding:mime-version:subject:date:from :dkim-signature; bh=V6VjwHdOuGql5ezgQLsLwwzSf/aEf2U+vKcsdfzTDiY=; b=m0Fv+nFI5WPxnd2CqGIOy0FEpAR7wJPDrsYs0lG93LPlY5p0iWunOB8QCvPVw8LQXW XdiVDsT8pqj3ZvnIc4GEJJTos2PUhIGsOv/8oCo0w7boeF4vQlVQ3uwo9++1cs2AbdBO 9CeJbu/7i6pDoiYMG8z4n20udrq9qhm1EfCjp03hkIprcrZsde2d7xleggMRGDrjGH/3 pNJr6ZyVp1Di8Pbmg5KHZT5x7KUF5bUggh9vmmWOabYaY0PVNjcVqENXwJJUguNGsaj5 jrD96T7wfdm8FFE/EAe8h3p8qk7zsRvxGcvXP7/V8JLLFprTwmjGUSpJj+8puIuA5J2o 206w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=VrXoYlQp; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id ik9-20020a170902ab0900b0019aaf311eaesi14672805plb.267.2023.03.08.15.00.14; Wed, 08 Mar 2023 15:00:54 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=VrXoYlQp; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229844AbjCHWqG (ORCPT + 99 others); Wed, 8 Mar 2023 17:46:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229994AbjCHWpt (ORCPT ); Wed, 8 Mar 2023 17:45:49 -0500 Received: from mail-ed1-x534.google.com (mail-ed1-x534.google.com [IPv6:2a00:1450:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE81BCF0C9 for ; Wed, 8 Mar 2023 14:45:46 -0800 (PST) Received: by mail-ed1-x534.google.com with SMTP id u9so72030037edd.2 for ; Wed, 08 Mar 2023 14:45:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1678315545; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=V6VjwHdOuGql5ezgQLsLwwzSf/aEf2U+vKcsdfzTDiY=; b=VrXoYlQp6ATF36g5gniyRXPT8ngc6BrdLdXwh/puwzg1HTf4DGSeJmKoYppeByuNT5 qeqLm+RIozb9sHOodcp6OpScZ5+Bq2Tip0h3yzkBZrdUixFFw0R64blDL+FwAKynERlR R9oePfbuASWKuC0Q0hr1A1BdcoOgZK9gZdjzs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678315545; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=V6VjwHdOuGql5ezgQLsLwwzSf/aEf2U+vKcsdfzTDiY=; b=pC5HCcO1WKIFyxyh9DeBvYpbB/9uq/yhrg0EpAKGSEMUCu6eglYFklSajMn0B2pFk5 KvbKIAiC6fcZ09kpm4H8HOnFStYICGALQD/v/uDA3HpIjn4XOQr45CLJBAlWaXpQzgnY Csr08IHWacG7y3R97h9p3ch9GSrgIH0c9HDX4VQJe6JC59WvihkMJ0PYFX7x6g6CQPfm 35fSvS9yDpaFeqTrcJwCgovYfThy/VfPoNnYI68dON346CMoLvPa/I/E6hrOCtzdgYS4 39IDKy7UfQZPt5XubuE/glb2/EGa+4inTqVY6FpNZP/WPZymS3M1bTBewsltBfVi6H4t 3Vew== X-Gm-Message-State: AO0yUKVNOd/hXkKgxVzIowRI5yRRhjy5Yz49sIqLyzzq4nycu+vo/lOZ StnSvKL5WxYWWbXuc25VmuJjHQ== X-Received: by 2002:a17:906:d9c8:b0:8e1:cc38:6ab0 with SMTP id qk8-20020a170906d9c800b008e1cc386ab0mr17630864ejb.16.1678315545101; Wed, 08 Mar 2023 14:45:45 -0800 (PST) Received: from alco.roam.corp.google.com (80.71.134.83.ipv4.parknet.dk. [80.71.134.83]) by smtp.gmail.com with ESMTPSA id ot18-20020a170906ccd200b008e40853a712sm8040167ejb.97.2023.03.08.14.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Mar 2023 14:45:44 -0800 (PST) From: Ricardo Ribalda Date: Wed, 08 Mar 2023 23:45:33 +0100 Subject: [PATCH RESEND v5 2/5] media: uvcvideo: Quirk for invalid dev_sof in Logitech C922 MIME-Version: 1.0 Message-Id: <20220920-resend-hwtimestamp-v5-2-139d1a144614@chromium.org> References: <20220920-resend-hwtimestamp-v5-0-139d1a144614@chromium.org> In-Reply-To: <20220920-resend-hwtimestamp-v5-0-139d1a144614@chromium.org> To: Laurent Pinchart , Mauro Carvalho Chehab Cc: "hn.chen" , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=5228; i=ribalda@chromium.org; h=from:subject:message-id; bh=9d83K9VEn5BR8bzm9yb8kPpgmV29vXBGj2CJMG3gKUQ=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBkCRAQxNj++KUZcM4H+69gz2NIx/W+XgLjafjtG49n VB+dDA+JAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCZAkQEAAKCRDRN9E+zzrEiM3gD/ 0bqfO++Qt1wc2nXVF6swkS9BT9t8uYJs5wDwl7JLpq8Tndrw+m8M8dyfCGtfdiqoGTOSIfzl1FDdbM MgIn7Nf57duW3IzTaJE2h95kAG0Unfa4nQe4OOvIKRIYBuc/+FynyNsQvV2qxr6CAFVR1VqHetQLMX hNVb+TjvTabGOk/bAm6X24nLN9qGIHCiLkJfKhf3rZwQcb+0+kmIeq2nOB0ky5ryRcILJnVFuZ6btW R5UCS9Euph5kw3pwa0IKV+dDZ+4ytyqAiPcZZBxFir14xymzn7avlSe+jLoFG7PAtFFJyXoIDp/CbY 1vTfSfPKpylxtMfWXm7ZeOUfE6aTnfXPFjU2Dhizfgt4c+GOrUfse/gXpgsZkLqig92why7T8/ucEh r/PPUTzwD4BSnTy2N8wiK+yy+BLMej/ZgLyMccO1PJ9K7p9+0OJ30M0U2mVoVBaFMbt38MDQEIlaOH T5uO8VxPjOnhCAFDBN+ssZhX9zhCpRqs6HokJoJfHhDpklSAyt9bE5YNpeJIVhdO9fAY9+xsuY73zc 9vYr41etLTF0BRJFTAzT5ACcnQn0nzu4Et/8V8ZqRELv36Aw0Nfl8Gv9gVEdHZ+vAIV3+uNsm5PyzR pHyOGTxnMzcGXdWBSt7ShSrI38oZEW2koGou/BXyjpvP8jQVaq+z0VvmkY7g== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759842355017882973?= X-GMAIL-MSGID: =?utf-8?q?1759842355017882973?= Logitech C922 internal SOF does not increases at a stable rate of 1kHz. This causes that the device_sof and the host_sof run at different rates, breaking the clock domain conversion algorithm. Eg: 30 (6) [-] none 30 614400 B 21.245557 21.395214 34.133 fps ts mono/SoE 31 (7) [-] none 31 614400 B 21.275327 21.427246 33.591 fps ts mono/SoE 32 (0) [-] none 32 614400 B 21.304739 21.459256 34.000 fps ts mono/SoE 33 (1) [-] none 33 614400 B 21.334324 21.495274 33.801 fps ts mono/SoE * 34 (2) [-] none 34 614400 B 21.529237 21.527297 5.130 fps ts mono/SoE * 35 (3) [-] none 35 614400 B 21.649416 21.559306 8.321 fps ts mono/SoE 36 (4) [-] none 36 614400 B 21.678789 21.595320 34.045 fps ts mono/SoE ... 99 (3) [-] none 99 614400 B 23.542226 23.696352 33.541 fps ts mono/SoE 100 (4) [-] none 100 614400 B 23.571578 23.728404 34.069 fps ts mono/SoE 101 (5) [-] none 101 614400 B 23.601425 23.760420 33.504 fps ts mono/SoE * 102 (6) [-] none 102 614400 B 23.798324 23.796428 5.079 fps ts mono/SoE * 103 (7) [-] none 103 614400 B 23.916271 23.828450 8.478 fps ts mono/SoE 104 (0) [-] none 104 614400 B 23.945720 23.860479 33.957 fps ts mono/SoE Instead of disabling completely the hardware timestamping for such hardware we take the assumption that the packet handling jitter is under 2ms and use the host_sof as dev_sof. We can think of the UVC hardware clock as a system with a coarse clock (the SOF) and a fine clock (the PTS). The coarse clock can be replaced with a clock on the same frequency, if the jitter of such clock is smaller than its sampling rate. That way we can save some of the precision of the fine clock. To probe this point we have run three experiments on the Logitech C922. On that experiment we run the camera at 33fps and we analyse the difference in msec between a frame and its predecessor. If we display the histogram of that value, a thinner histogram will mean a better meassurement. The results for: - original hw timestamp: https://ibb.co/D1HJJ4x - pure software timestamp: https://ibb.co/QC9MgVK - modified hw timestamp: https://ibb.co/8s9dBdk This bug in the camera firmware has been confirmed by the vendor. lsusb -v Bus 001 Device 044: ID 046d:085c Logitech, Inc. C922 Pro Stream Webcam Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x046d Logitech, Inc. idProduct 0x085c C922 Pro Stream Webcam bcdDevice 0.16 iManufacturer 0 iProduct 2 C922 Pro Stream Webcam iSerial 1 80B912DF bNumConfigurations 1 Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_driver.c | 9 +++++++++ drivers/media/usb/uvc/uvc_video.c | 8 +++++++- drivers/media/usb/uvc/uvcvideo.h | 1 + 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index c1e3c1fab976..eae88d0f420e 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -2569,6 +2569,15 @@ static const struct usb_device_id uvc_ids[] = { .bInterfaceSubClass = 1, .bInterfaceProtocol = 0, .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT) }, + /* Logitech HD Pro Webcam C922 */ + { .match_flags = USB_DEVICE_ID_MATCH_DEVICE + | USB_DEVICE_ID_MATCH_INT_INFO, + .idVendor = 0x046d, + .idProduct = 0x085c, + .bInterfaceClass = USB_CLASS_VIDEO, + .bInterfaceSubClass = 1, + .bInterfaceProtocol = 0, + .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_INVALID_DEVICE_SOF) }, /* Chicony CNF7129 (Asus EEE 100HE) */ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_INFO, diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 488c58bc9919..f4470f6df45c 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -541,7 +541,13 @@ uvc_video_clock_decode(struct uvc_streaming *stream, struct uvc_buffer *buf, stream->clock.last_sof = dev_sof; - host_sof = usb_get_current_frame_number(stream->dev->udev); + /* + * On some devices, like the Logitech C922, the device SOF does not run + * at a stable rate of 1kHz. For those devices use the host SOF instead. + */ + if (stream->dev->quirks & UVC_QUIRK_INVALID_DEVICE_SOF) + dev_sof = usb_get_current_frame_number(stream->dev->udev); + time = uvc_video_get_time(); /* diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 22656755a801..699c33bc24ed 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -73,6 +73,7 @@ #define UVC_QUIRK_FORCE_Y8 0x00000800 #define UVC_QUIRK_FORCE_BPP 0x00001000 #define UVC_QUIRK_WAKE_AUTOSUSPEND 0x00002000 +#define UVC_QUIRK_INVALID_DEVICE_SOF 0x00004000 /* Format flags */ #define UVC_FMT_FLAG_COMPRESSED 0x00000001