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[83.28.44.124]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48fec8d88e1sm8999211f8f.15.2026.11.05.01.33.50 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 05 Nov 2026 01:33:50 -0800 (PST) Date: Thu, 5 Nov 2026 10:33:47 +0100 From: Michal Pecio To: Hans de Goede Cc: Kuangyi Chiang , laurent.pinchart@ideasonboard.com, mchehab@kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] media: uvcvideo: Add UVC_QUIRK_CTL_MSG_DELAY_1M for HIK camera Message-ID: <20261105103347.4983b901.michal.pecio@gmail.com> In-Reply-To: <7c254ab7-579e-4c17-80fb-596e6fdd29a9@kernel.org> References: <20261029033106.7374-1-ki.chiang65@gmail.com> <7c254ab7-579e-4c17-80fb-596e6fdd29a9@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Hans, Kuangyi Chiang has also reported this to linux-usb and linked here. On Thu, 29 Oct 2026 13:46:04 +0100, Hans de Goede wrote: > Is this a USB-2.0 camera connected to a XHCI controller ? > > And if yes, how old is this camera model ? > > The reason why I'm asking this is because the EHCI USB-2.0 controller > interface causes a natural delay between consecutive ctrl commands > queued one by one till the start of the next USB frrame, so they get > spaced 1 ms apart. > > Where as the modern XHCI controller interface will put these > back-to-back on the USB bus. We've seen some issues with (older) USB > devices before where they needed some delay because they were > originally only validated with EHCI controllers and the hw/ff assumes > it will get some "breathing space" between control messages. Are you sure that this wasn't possible with EHCI at all? What sort of devices were affected? A bit surprising to see that there is apparently no quirk for a known issue. Regards, Michal