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([38.81.85.65]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6740efc941csm3634057d50.20.2026.09.27.15.06.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 15:06:26 -0700 (PDT) From: Michael Jordan To: Ricardo Ribalda Cc: Michael Jordan , Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab , Hans Verkuil , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 3/3] media: uvcvideo: fix up missing AUTO_UPDATE on the OBSBOT Tiny 2 Date: Sun, 27 Sep 2026 18:06:24 -0400 Message-ID: <20260927220625.629672-1-jordan.mymail@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: <20260902002553.34839-1-jordan.mymail@gmail.com> <20260902002553.34839-4-jordan.mymail@gmail.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Ricardo, On Wed, 2 Sep 2026 08:34:34 +0200, Ricardo Ribalda wrote: > Reviewed-by: Ricardo Ribalda Thanks for the reviews on v2. I have a question about how to handle a second device. I now have an OBSBOT Tail 2 (3564:fefc) and it has the same defect as the Tiny 2. Its GET_INFO bytes match the Tiny 2 control for control: CT_PANTILT_ABSOLUTE 0x03 CT_PANTILT_RELATIVE 0x03 CT_ZOOM_ABSOLUTE 0x03 CT_ZOOM_RELATIVE 0x0f CT_ROLL_ABSOLUTE 0x01 Without a fixup entry, pan_absolute reads back the commanded target the moment it is written. With entries for 3564:fefc on top of v2, all three controls report the live value on GET_CUR, both during a commanded move and when the camera changes them on its own: - pan/tilt position and pan/tilt speed follow the gimbal under the camera's subject tracking, with the host issuing no requests; - zoom follows a zoom change made at the camera. I checked the other AUTO_UPDATE controls the same way as for the Tiny 2. White balance and focus only echo the last SET_CUR. Exposure time reports live values until the host writes a manual exposure once, and from then on echoes that value, across a power cycle. I would leave all of those alone, as on the Tiny 2. So the change is three more table entries, identical to the Tiny 2 ones apart from the product ID. v2 still applies cleanly to media/next as of 2dcdfb625c3b, so nothing else forces a respin. Which would you prefer? a) a v3 with the Tail 2 entries folded into 3/3; b) a v3 with the Tail 2 entries as a new 4/4, leaving 1-3 as reviewed; c) leave v2 as it is, and send the Tail 2 entries as a follow-up patch once v2 is applied. I lean towards (c), so that a reviewed series is not disturbed, but I am happy to do whichever is easiest for you and Laurent. In any of the three I will include the Tail 2 lsusb -v output. Thanks, Michael