From nobody Thu Sep 18 15:38:38 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9C34C4321E for ; Mon, 5 Dec 2022 12:53:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231983AbiLEMxZ (ORCPT ); Mon, 5 Dec 2022 07:53:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231961AbiLEMxV (ORCPT ); Mon, 5 Dec 2022 07:53:21 -0500 Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9CC9D1A396 for ; Mon, 5 Dec 2022 04:53:20 -0800 (PST) Received: by mail-ed1-x529.google.com with SMTP id d14so10665727edj.11 for ; Mon, 05 Dec 2022 04:53:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=cc:to:message-id:content-transfer-encoding:mime-version:subject :date:from:from:to:cc:subject:date:message-id:reply-to; bh=8pktvKtBLNq1PAA5aM/sYGTOJ0VBRLMEQcf2yEqcZqw=; b=iymU2SEmxN3Z7pWDWqvpK+oxnRigFRqXjn4ICnAE5LHqYOfixqb6usbk7EmDicXcIz 8F2e9icw6ViPvU1EpPk37Y5GnzI/hkV5zFCxTDOO8RXFJuqMcvCBAIIXTAtvBSu/pELN 6dy6A/gqK0Qn1TWrJt3IRjT1rjhPJTYUzX0zs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:message-id:content-transfer-encoding:mime-version:subject :date:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=8pktvKtBLNq1PAA5aM/sYGTOJ0VBRLMEQcf2yEqcZqw=; b=QnsAy1C6UJh4UEZ34A8Hjqh/0vw9gzzzvEy8xRAUmwDy1/s22pXThmzrpJfKxDTTvI p7Z8bEVPvy+0BkaJ7kEr5Kk1R3aHRsSask4SifM4ZV+fdjGAnPeqcyS1jzUb/LVcn405 O4695JdMlnVfvjUmOFd9NrTqwHL3BK5ndQ1OOmMWbr1TWvAooafzWqxxHGiUbZuM3L20 bG9W+lJZzRoC9OEmf6OqFHFqIvmWNQsuZ8ofbLTrxdE2L6b4bg+vjzsMq85UZ6npAxqY vOE3jGBm5CiSGVCoNKEmrBjzf6UBLCuo9CtAVDal6ypfRnDBsxVAPHUUsDmHneqDaDVj McXA== X-Gm-Message-State: ANoB5pnZL2XCBVugoILcYDhSoQi4aEnTqb8YqAN+TYrZdvBceTstq3Qd 2eBjii6MEbmhKZS8HPZd3VmH+g== X-Google-Smtp-Source: AA0mqf7xREaNKTnUTqwE2OWl+MtDFzAat59ZM3DlL0i5NKrJp6j+s55EEQof1Ig3VIQ41P4lFbnQfw== X-Received: by 2002:aa7:d14c:0:b0:46c:f8af:b331 with SMTP id r12-20020aa7d14c000000b0046cf8afb331mr440531edo.390.1670244799173; Mon, 05 Dec 2022 04:53:19 -0800 (PST) Received: from alco.roam.corp.google.com ([2620:0:1059:10:e241:d242:baa1:ab8a]) by smtp.gmail.com with ESMTPSA id rr25-20020a170907899900b007c00323cc23sm6176444ejc.27.2022.12.05.04.53.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Dec 2022 04:53:18 -0800 (PST) From: Ricardo Ribalda Date: Mon, 05 Dec 2022 13:53:01 +0100 Subject: [PATCH v3] 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-v3-0-57668054127f@chromium.org> To: Mauro Carvalho Chehab , Laurent Pinchart Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Yunke Cao , Sergey Senozhatsky , Ricardo Ribalda X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=3800; i=ribalda@chromium.org; h=from:subject:message-id; bh=Zf5Wsf2SpYeBdvbLdiOq0t+7iE7rTaz9vkE/4tO7rXI=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjjemvdZqK1J8e6vN3ZJaryXWNOdpEMaVV7uiXExc4 SkdLoUiJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY43prwAKCRDRN9E+zzrEiOw3EA CeBMHgCQiE8AT1ll56nXYaETiGvdksawnUrCBO8+AKJqLLnAiyPDBlhpum8YO0Ow2vxjcIvSvPPrgq T4kJ2dxNwerUklr1EYfEgEQ0ZhyLt1D/ws0E+/RlsKNqQTAvOF8UAU6+Gccw8N4pLe2kkxCjYNep5W M+pYfnp8VAF1j1JcAPphP44UAVeHXLMoI0j5+Sblmyku5vReLYhgnbRiRV+xUceG2Weyc8xck5eWy+ V9cNrNuq/M7BZr8i7qOnDKtThn+49MY3kKFbr7u4DpQnWCFEVxPP7Pq0GBPSAC10qKQYEtcdrDyXDH YKIJmDw58Cgw6PH//XFdaROzHYhx7YfXGoPcWxfKDoNLRoE2Myg1O06WB9B37qt2HKg5ASo3fOF7eG 3bDcpoPCUCeocYO6ar2Gqxg6kJWLKh3V9VnWgJWZnmKB+P7xkEpKl9uJwsxwNqBGFkL6fGOBJuhRWp FqY31USrNyq0FIIBBMZ7zoHNmef8i5EmZB+P50V13E8+EuACH/vupHwcFdsb/mK58e1PvEp0OgyteN X3RBgqf11AIMIPGUkWwFTW9SlVd2B4sU8C7dOLpbRg1Ht8GoQhiXfr6gyAzYs9OrTfPcmXTQCP4NBI JiIcZRSHcJCSY3ATch1mw8M63CuiXl9Zzq0CVy9sftjfZq6b7xmT/H3qkwrg== 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 Reviewed-by: Sergey Senozhatsky Signed-off-by: Ricardo Ribalda Reviewed-by: Laurent Pinchart --- 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 v3: - Add Reviewed-by: Sergey - Improve identation (Thanks Sergey!) - Link to v2: https://lore.kernel.org/r/20220920-resend-elgato-v2-0-06b48b3= b486a@chromium.org 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 | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_= video.c index 170a008f4006..a8323cf0e9f9 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -129,12 +129,13 @@ 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 +298,7 @@ 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 +2122,20 @@ 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