From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B23D2346E63 for ; Thu, 1 Oct 2026 22:50:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790895046; cv=none; b=pl+61Tp1MqSCUCtptKIUnYjoB8ucKHL8+/fL/VuFJsNCARm10ETJ85/EDAoezdKfVSn55HJ0kv/MfMSATeKIjQGUiDfVDndu6MXIfpJbemXmLQNFV0UubVZaQ3+NcWZJgJzGvulG5om7o3+AydntFY5zXiHZG9fFNzuYYv4B4Io= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790895046; c=relaxed/simple; bh=hbaWfqTT50rz/0Ibb9FN7fOZGgV8qI7vnWW/cMLRjW4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; 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Fri, 2 Oct 2026 00:48:46 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1790894927; bh=hbaWfqTT50rz/0Ibb9FN7fOZGgV8qI7vnWW/cMLRjW4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=a06o7VOQ/FMeaKGKiSjvwGfcThhG66bQ37QKDi4AhXZaK9EOLKgU+UavKTFc7Bq45 hhnb1vXT60FhqY6EdSXuxEBw22asioy9ygmm6oAZ/HKUHuU0IrebS24NNTMjbgIpbp UtkaUCLgYlF01sIUVXQvo3ZYNBief+LX7Hgv+kQw= Date: Fri, 2 Oct 2026 01:50:38 +0300 From: Laurent Pinchart To: Hans de Goede Cc: Yunke Cao , Ricardo Ribalda , Mauro Carvalho Chehab , linux-media@vger.kernel.org Subject: Re: [PATCH] media: uvcvideo: Add quirk for invalid dev_sof in Logitech C925e Message-ID: <20261001225038.GA4649@killaraus.ideasonboard.com> References: <20260803065811.3490286-1-yunkec@google.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On Tue, Sep 29, 2026 at 04:27:17PM +0200, Hans de Goede wrote: > Hi, > > On 3-Aug-26 08:58, Yunke Cao wrote: > > Logitech C925e SOF does not increases at a stable rate of 1kHz. > > Add a quirk for this camera to make hwtimestamp usable. > > > > Before applying the quirk: > > ``` > > seq: 31 ts: 1075.543294 delta: 29.423 ms fps: 34.94 > > seq: 32 ts: 1075.573022 delta: 29.728 ms fps: 34.90 > > seq: 33 ts: 1075.602353 delta: 29.331 ms fps: 34.87 > > seq: 34 ts: 1075.632031 delta: 29.678 ms fps: 34.84 > > seq: 35 ts: 1076.177759 delta: 545.728 ms fps: 23.00 > > seq: 36 ts: 1076.213255 delta: 35.496 ms fps: 23.12 > > seq: 37 ts: 1076.209371 delta: -3.884 ms fps: 23.82 > > seq: 38 ts: 1076.232233 delta: 22.862 ms fps: 24.11 > > seq: 39 ts: 1076.264682 delta: 32.449 ms fps: 24.24 > > seq: 40 ts: 1076.287318 delta: 22.636 ms fps: 24.52 > > seq: 41 ts: 1076.285949 delta: -1.369 ms fps: 25.16 > > seq: 42 ts: 1076.317714 delta: 31.765 ms fps: 25.28 > > seq: 43 ts: 1076.317085 delta: -0.629 ms fps: 25.89 > > seq: 44 ts: 1076.339919 delta: 22.834 ms fps: 26.13 > > seq: 45 ts: 1076.212836 delta: -127.083 ms fps: 28.91 > > seq: 46 ts: 1076.242494 delta: 29.658 ms fps: 29.00 > > seq: 47 ts: 1076.271852 delta: 29.358 ms fps: 29.09 > > seq: 48 ts: 1076.301739 delta: 29.887 ms fps: 29.17 > > seq: 49 ts: 1076.330887 delta: 29.148 ms fps: 29.26 > > seq: 50 ts: 1076.360639 delta: 29.752 ms fps: 29.33 > > seq: 51 ts: 1076.390095 delta: 29.456 ms fps: 29.41 > > ``` > > > > After applying the quirk: > > ``` > > seq: 31 ts: 203.782342 delta: 33.460 ms fps: 30.94 > > seq: 32 ts: 203.815492 delta: 33.150 ms fps: 30.91 > > seq: 33 ts: 203.849017 delta: 33.525 ms fps: 30.88 > > seq: 34 ts: 203.882190 delta: 33.173 ms fps: 30.86 > > seq: 35 ts: 203.915672 delta: 33.482 ms fps: 30.83 > > seq: 36 ts: 203.948902 delta: 33.230 ms fps: 30.81 > > seq: 37 ts: 203.982335 delta: 33.433 ms fps: 30.78 > > seq: 38 ts: 204.015475 delta: 33.140 ms fps: 30.76 > > seq: 39 ts: 204.048992 delta: 33.517 ms fps: 30.74 > > seq: 40 ts: 204.082208 delta: 33.216 ms fps: 30.72 > > seq: 41 ts: 204.115675 delta: 33.467 ms fps: 30.70 > > seq: 42 ts: 204.148995 delta: 33.320 ms fps: 30.69 > > seq: 43 ts: 204.182354 delta: 33.359 ms fps: 30.67 > > seq: 44 ts: 204.215605 delta: 33.251 ms fps: 30.66 > > seq: 45 ts: 204.249004 delta: 33.399 ms fps: 30.64 > > seq: 46 ts: 204.282259 delta: 33.255 ms fps: 30.63 > > seq: 47 ts: 204.315686 delta: 33.427 ms fps: 30.61 > > seq: 48 ts: 204.348945 delta: 33.259 ms fps: 30.60 > > seq: 49 ts: 204.382337 delta: 33.392 ms fps: 30.59 > > seq: 50 ts: 204.415570 delta: 33.233 ms fps: 30.58 > > seq: 51 ts: 204.449069 delta: 33.499 ms fps: 30.56 > > seq: 52 ts: 204.482218 delta: 33.149 ms fps: 30.55 > > seq: 53 ts: 204.515706 delta: 33.488 ms fps: 30.54 > > seq: 54 ts: 204.548940 delta: 33.234 ms fps: 30.53 > > seq: 55 ts: 204.582403 delta: 33.463 ms fps: 30.52 > > seq: 56 ts: 204.615563 delta: 33.160 ms fps: 30.51 > > seq: 57 ts: 204.649057 delta: 33.494 ms fps: 30.50 > > seq: 58 ts: 204.682301 delta: 33.244 ms fps: 30.49 > > seq: 59 ts: 204.715735 delta: 33.434 ms fps: 30.48 > > seq: 60 ts: 204.748890 delta: 33.155 ms fps: 30.48 > > ``` > > Thank you for your patch. > > I have merged this into: > > https://gitlab.freedesktop.org/linux-media/users/uvc/-/commits/for-next/ > > > lsusb -v > > > > Bus 003 Device 005: ID 046d:085b > > Device Descriptor: > > bLength 18 > > bDescriptorType 1 > > bcdUSB 2.00 > > bDeviceClass 239 > > bDeviceSubClass 2 > > bDeviceProtocol 1 > > bMaxPacketSize0 64 > > idVendor 0x046d > > idProduct 0x085b > > bcdDevice 0.16 > > iManufacturer 0 > > iProduct 2 Logitech Webcam C925e > > iSerial 1 2F2036AF > > bNumConfigurations 1 > > > > Signed-off-by: Yunke Cao > > --- > > drivers/media/usb/uvc/uvc_driver.c | 9 +++++++++ > > 1 file changed, 9 insertions(+) > > > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c > > index e289cc71ba98..5b9ea19ad9f2 100644 > > --- a/drivers/media/usb/uvc/uvc_driver.c > > +++ b/drivers/media/usb/uvc/uvc_driver.c > > @@ -2706,6 +2706,15 @@ static const struct usb_device_id uvc_ids[] = { > > .bInterfaceSubClass = 1, > > .bInterfaceProtocol = 0, > > .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_INVALID_DEVICE_SOF) }, > > + /* Logitech HD Pro Webcam C925e */ > > + { .match_flags = USB_DEVICE_ID_MATCH_DEVICE > > + | USB_DEVICE_ID_MATCH_INT_INFO, > > + .idVendor = 0x046d, > > + .idProduct = 0x085b, > > + .bInterfaceClass = USB_CLASS_VIDEO, > > + .bInterfaceSubClass = 1, > > + .bInterfaceProtocol = 0, > > + .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_INVALID_DEVICE_SOF) }, The entry isn't correctly sorted by VID:PID. I'll fix it and rebase the for-next branch. > > /* Logitech Rally Bar Huddle */ > > { .match_flags = USB_DEVICE_ID_MATCH_DEVICE > > | USB_DEVICE_ID_MATCH_INT_INFO, -- Regards, Laurent Pinchart