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 <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Ricardo Ribalda <[email protected]>
---
Recover stalled ElGato devices
Just a resend of this hw fix.
To: Laurent Pinchart <[email protected]>
To: Mauro Carvalho Chehab <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Sergey Senozhatsky <[email protected]>
Cc: Yunke Cao <[email protected]>
---
Changes in v4:
- Add Reviewed-by: Laurent
- Update error messages (Thanks Laurent!)
- Swap checks on if (Thanks Laurent)
- Link to v3: https://lore.kernel.org/r/[email protected]
Changes in v3:
- Add Reviewed-by: Sergey
- Improve identation (Thanks Sergey!)
- Link to v2: https://lore.kernel.org/r/[email protected]
Changes in v2:
- Remove info from lsusb
- Link to v1: https://lore.kernel.org/r/[email protected]
---
drivers/media/usb/uvc/uvc_video.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 170a008f4006..ba7c159cb2a6 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;
}
+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 +298,7 @@ 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 +2122,21 @@ 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 (ret == -EPROTO &&
+ usb_match_one_id(stream->dev->intf, &elgato_cam_link_4k)) {
+ dev_err(&stream->intf->dev, "Elgato Cam Link 4K firmware crash detected\n");
+ dev_err(&stream->intf->dev, "Resetting the device, unplug and replug to recover\n");
+ usb_reset_device(stream->dev->udev);
+ }
+
if (ret < 0)
return ret;
---
base-commit: 521a547ced6477c54b4b0cc206000406c221b4d6
change-id: 20220920-resend-elgato-a845482bdd02
Best regards,
--
Ricardo Ribalda <[email protected]>
Hi Ricardo,
On Tue, Dec 06, 2022 at 12:15:04AM +0100, 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
>
> Reviewed-by: Sergey Senozhatsky <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Ricardo Ribalda <[email protected]>
> ---
> Recover stalled ElGato devices
>
> Just a resend of this hw fix.
Taken in my tree, thanks.
> To: Laurent Pinchart <[email protected]>
> To: Mauro Carvalho Chehab <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: Sergey Senozhatsky <[email protected]>
> Cc: Yunke Cao <[email protected]>
> ---
> Changes in v4:
> - Add Reviewed-by: Laurent
> - Update error messages (Thanks Laurent!)
> - Swap checks on if (Thanks Laurent)
> - Link to v3: https://lore.kernel.org/r/[email protected]
>
> Changes in v3:
> - Add Reviewed-by: Sergey
> - Improve identation (Thanks Sergey!)
> - Link to v2: https://lore.kernel.org/r/[email protected]
>
> Changes in v2:
> - Remove info from lsusb
> - Link to v1: https://lore.kernel.org/r/[email protected]
> ---
> drivers/media/usb/uvc/uvc_video.c | 24 ++++++++++++++++++++----
> 1 file changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index 170a008f4006..ba7c159cb2a6 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;
> }
>
> +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 +298,7 @@ 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 +2122,21 @@ 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 (ret == -EPROTO &&
> + usb_match_one_id(stream->dev->intf, &elgato_cam_link_4k)) {
> + dev_err(&stream->intf->dev, "Elgato Cam Link 4K firmware crash detected\n");
> + dev_err(&stream->intf->dev, "Resetting the device, unplug and replug to recover\n");
> + usb_reset_device(stream->dev->udev);
> + }
> +
> if (ret < 0)
> return ret;
>
>
> ---
> base-commit: 521a547ced6477c54b4b0cc206000406c221b4d6
> change-id: 20220920-resend-elgato-a845482bdd02
--
Regards,
Laurent Pinchart