[v2] media: uvcvideo: Recover stalled ElGato devices
Commit Message
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 <ribalda@chromium.org>
---
Recover stalled ElGato devices
Just a resend of this hw fix.
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Yunke Cao <yunkec@chromium.org>
---
Changes in v2:
- Remove info from lsusb
- Link to v1: https://lore.kernel.org/r/20220920-resend-elgato-v1-0-8672a2380e3d@chromium.org
---
drivers/media/usb/uvc/uvc_video.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
---
base-commit: 521a547ced6477c54b4b0cc206000406c221b4d6
change-id: 20220920-resend-elgato-a845482bdd02
Best regards,
Comments
On (22/12/02 18:01), Ricardo Ribalda wrote:
> 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 <ribalda@chromium.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
>
> +static const struct usb_device_id elgato_cam_link_4k = {
> + USB_DEVICE(0x0fd9, 0x0066)};
> +
A nit, I'd format this slightly different:
+static const struct usb_device_id elgato_cam_link_4k = {
+ USB_DEVICE(0x0fd9, 0x0066)
+};
@@ -129,12 +129,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
return -EPIPE;
}
+static const struct usb_device_id elgato_cam_link_4k = {
+ 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 = {
- USB_DEVICE(0x0fd9, 0x0066)
- };
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
unsigned int i;
@@ -297,7 +297,7 @@ static int uvc_get_video_ctrl(struct uvc_streaming *stream,
dev_err(&stream->intf->dev,
"Failed to query (%u) UVC %s control : %d (exp. %u).\n",
query, probe ? "probe" : "commit", ret, size);
- ret = -EIO;
+ ret = (ret == -EPROTO) ? -EPROTO : -EIO;
goto out;
}
@@ -2121,6 +2121,20 @@ int uvc_video_init(struct uvc_streaming *stream)
* request on the probe control, as required by the UVC specification.
*/
ret = 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 == -EPROTO)) {
+ usb_reset_device(stream->dev->udev);
+ dev_err(&stream->intf->dev, "Restarting Elgato Cam Link 4K\n");
+ }
+
if (ret < 0)
return ret;