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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id m10-20020aa7c48a000000b0045b3853c4b7sm3111528edq.51.2022.12.02.09.01.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 09:01:12 -0800 (PST) From: Ricardo Ribalda Date: Fri, 02 Dec 2022 18:01:07 +0100 Subject: [PATCH v2] media: uvcvideo: Recover stalled ElGato devices MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20220920-resend-elgato-v2-0-06b48b3b486a@chromium.org> To: Mauro Carvalho Chehab , Laurent Pinchart Cc: Sergey Senozhatsky , linux-kernel@vger.kernel.org, Ricardo Ribalda , linux-media@vger.kernel.org, Yunke Cao X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=3562; i=ribalda@chromium.org; h=from:subject:message-id; bh=Yd9dIG/JiyCXqVOfCELBolrMGzArptXcaP/svlsJG2g=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjii9VlLRoLlAgECDFoybg7+F8l22YZbz6mRXcEHok PObjDhWJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4ovVQAKCRDRN9E+zzrEiIxOEA CY/TFzXhV/Enno/NNx6IwrrRYQvaq5APqxIKfuX1gJQr0Plv9Eet+ncRtptywVr/UiRMway8/LeeEA KL9fS8j+2UC26ui4xRnWCdWXi3hCwH+I4LibzxnUJgkIbsgc9AUBrZHP6+IOTNfn6ku8+fOyHDsbPS FVwUjf8707/Gd9cNsWByQcscVMt7xpkbnudFSXqu37aa6B+C7JagGDAEwj/aLvb5Ddd76ucq0Htw6O lcGbVnfvSx7FsZMu6YbLFUNB9kf4xDL9X5bKDLGOXgbVwf9x+LrGAvNKadDD4kkpvaOmo5/smtDiT9 GqqTLm85JCtJqhNzFe/mVuqeSOH3AH6MH3U7f2MBSyEbMNM6pLnv0yHQntwclwITCQUEEGHxYGAHf3 FwWPl48DfhqsT0BboW4h6iADrghckuWoAd7e1WR1M7in8/4C8zwOD8Tsy0IrHf6n+LiKbKbCYp8tx4 MSQW50JCCyfGpz/k3lM9CARe5qEWIiLeia/qnQrq30uWbj+l0jV+c/GwVfFxfxsn48qc7eCxzAZhtv mawm7Y3K5JHf3k5Q0gtruGnF0ME8evJkLzq7sh4L3PpK/rVKlzvr2k/GkiNGABEEquMbtIHkZNWb/G qRcYOlwlt2QFMyyTdRy+vco365cnumdWVP8aNsyNGKWUrdcp1kr15SPLuYjA== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Elgato Cam Link 4k can be in a stalled state if the resolution of the external source has changed while the firmware initializes. Once in this state, the device is useless until it receives a USB reset. It has even been observed that the stalled state will continue even after unplugging the device. lsusb -v Bus 002 Device 002: ID 0fd9:0066 Elgato Systems GmbH Cam Link 4K Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association bMaxPacketSize0 9 idVendor 0x0fd9 Elgato Systems GmbH idProduct 0x0066 bcdDevice 0.00 iManufacturer 1 Elgato iProduct 2 Cam Link 4K iSerial 4 0005AC52FE000 bNumConfigurations 1 Signed-off-by: Ricardo Ribalda Reviewed-by: Sergey Senozhatsky --- Recover stalled ElGato devices Just a resend of this hw fix. To: Laurent Pinchart To: Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Sergey Senozhatsky Cc: Yunke Cao --- Changes in v2: - Remove info from lsusb=20 - Link to v1: https://lore.kernel.org/r/20220920-resend-elgato-v1-0-8672a23= 80e3d@chromium.org --- drivers/media/usb/uvc/uvc_video.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_= video.c index 170a008f4006..ad1762b66c4c 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -129,12 +129,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, = u8 unit, return -EPIPE; } =20 +static const struct usb_device_id elgato_cam_link_4k =3D { + USB_DEVICE(0x0fd9, 0x0066)}; + static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, struct uvc_streaming_control *ctrl) { - static const struct usb_device_id elgato_cam_link_4k =3D { - USB_DEVICE(0x0fd9, 0x0066) - }; struct uvc_format *format =3D NULL; struct uvc_frame *frame =3D NULL; unsigned int i; @@ -297,7 +297,7 @@ static int uvc_get_video_ctrl(struct uvc_streaming *str= eam, dev_err(&stream->intf->dev, "Failed to query (%u) UVC %s control : %d (exp. %u).\n", query, probe ? "probe" : "commit", ret, size); - ret =3D -EIO; + ret =3D (ret =3D=3D -EPROTO) ? -EPROTO : -EIO; goto out; } =20 @@ -2121,6 +2121,20 @@ int uvc_video_init(struct uvc_streaming *stream) * request on the probe control, as required by the UVC specification. */ ret =3D uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR); + + /* + * Elgato Cam Link 4k can be in a stalled state if the resolution of + * the external source has changed while the firmware initializes. + * Once in this state, the device is useless until it receives a + * USB reset. It has even been observed that the stalled state will + * continue even after unplugging the device. + */ + if (usb_match_one_id(stream->dev->intf, &elgato_cam_link_4k) && + (ret =3D=3D -EPROTO)) { + usb_reset_device(stream->dev->udev); + dev_err(&stream->intf->dev, "Restarting Elgato Cam Link 4K\n"); + } + if (ret < 0) return ret; =20 --- base-commit: 521a547ced6477c54b4b0cc206000406c221b4d6 change-id: 20220920-resend-elgato-a845482bdd02 Best regards, --=20 Ricardo Ribalda