For Alcor Corp. Slave camera(1b17:6684), 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. so we check the dwMaxPayloadTransferSize fields, if it large than 0x1000, reset dwMaxPayloadTransferSize to 1024. Signed-off-by: Ai Chao <aichao@xxxxxxxxxx> --- drivers/media/usb/uvc/uvc_video.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index d2eb9066e4dc..49226c3f423c 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -234,6 +234,14 @@ 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) && + (le16_to_cpu(stream->dev->udev->descriptor.idVendor) == 0x1b17) && + (le16_to_cpu(stream->dev->udev->descriptor.idProduct) == 0x6684)) { + ctrl->dwMaxPayloadTransferSize = 1024; + } } static size_t uvc_video_ctrl_size(struct uvc_streaming *stream) -- 2.25.1