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[83.28.46.125]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488d689110asm10548365e9.35.2026.04.09.21.47.19 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 09 Apr 2026 21:47:20 -0700 (PDT) Date: Fri, 10 Apr 2026 06:47:16 +0200 From: Michal Pecio To: Jeffrey Hein Cc: Ricardo Ribalda , Alan Stern , Laurent Pinchart , Hans de Goede , Greg Kroah-Hartman , linux-media@vger.kernel.org, linux-usb@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v5 2/3] media: uvcvideo: add UVC_QUIRK_CTRL_THROTTLE for fragile firmware Message-ID: <20260410064716.1f5d69c4.michal.pecio@gmail.com> In-Reply-To: References: <20260331003806.212565-1-jp@jphein.com> <20260331003806.212565-3-jp@jphein.com> <20260409100247.7cfb62d1.michal.pecio@gmail.com> <20260409221749.5e6bccab.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 9 Apr 2026 17:24:36 -0700, Jeffrey Hein wrote: > So wBytesPerInterval (8) is indeed 8x smaller than wMaxPacketSize > (64), matching what you saw in the third-party listing. Technically it's a spec violation if a device claims 8 bytes but respons with a single packet larger than that to a 16 byte (or any other) URB. Though no problems were known to result until last month. It seems most host controllers ignore byte per interval on interrupt. > Note that lsusb -vv does not decode wBytesPerInterval for this > endpoint -- the value above was parsed from the raw descriptor bytes > in sysfs. The full lsusb -vv (934 lines) is now in the repo: It does decode it, but you need the latest usbutils version 019. And there should be no need for lsusb -vv, just lsusb -v. I think the output pasted into v6 patch was truncated. Regards, Michal