For Alcor Corp. Slave camera(1b17:6684/2017:0011), it support to
output compressed video data, and it return a wrong
dwMaxPayloadTransferSize fields. This is a fireware issue,
but the manufacturer cannot provide a const return fields
by the fireware. For some device, device requested 2752512
B/frame bandwidth. For some device, device requested 3072
B/frame bandwidth. so we check the dwMaxPayloadTransferSize
fields,if it large than 0x1000, reset dwMaxPayloadTransferSize
to 1024, and the camera preview normally.
Signed-off-by: Ai Chao <aichao@xxxxxxxxxx>
---
change for v3
- Add VID/PID 2017:0011
change for v2
- Used usb_match_one_id to check VID and PID
---
---
drivers/media/usb/uvc/uvc_video.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index d2eb9066e4dc..1260800ef8bd 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -135,6 +135,10 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
static const struct usb_device_id elgato_cam_link_4k = {
USB_DEVICE(0x0fd9, 0x0066)
};
+ static const struct usb_device_id alcor_corp_slave_cam = {
+ USB_DEVICE(0x1b17, 0x6684),
+ USB_DEVICE(0x2017, 0x0011),
+ };
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
unsigned int i;
@@ -234,6 +238,13 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
ctrl->dwMaxPayloadTransferSize = bandwidth;
}
+
+ /* Alcor Corp. Slave camera return wrong dwMaxPayloadTransferSize */
+ if ((format->flags & UVC_FMT_FLAG_COMPRESSED) &&
+ (ctrl->dwMaxPayloadTransferSize > 0x1000) &&
+ usb_match_one_id(stream->dev->intf, &alcor_corp_slave_cam)) {
+ ctrl->dwMaxPayloadTransferSize = 1024;
+ }
}
static size_t uvc_video_ctrl_size(struct uvc_streaming *stream)
--
2.25.1
