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
