diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2015-05-13 00:57:53 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-05-30 18:12:15 +0300 |
| commit | 37f85b276a36b531234992b05eb057841af46fb4 (patch) | |
| tree | c077d309dc7e2186ba576c2df01a87bad938a8ed | |
| parent | 7195f61b801104add6453e1d8a39d5c8366fc446 (diff) | |
| download | linux-37f85b276a36b531234992b05eb057841af46fb4.tar.xz | |
[media] uvcvideo: Fix incorrect bandwidth with Chicony device 04f2:b50b
The "TOSHIBA Web Camera - 5M" Chicony device (04f2:b50b) seems to
compute the bandwidth on 16 bits and erroneously sign-extend it to
32 bits, resulting in a huge bandwidth value. Detect and fix that
condition by setting the 16 MSBs to 0 when they're all equal to 1.
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
| -rw-r--r-- | drivers/media/usb/uvc/uvc_video.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 20ccc9d315dc..f839654ea436 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -119,6 +119,14 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream, ctrl->dwMaxVideoFrameSize = frame->dwMaxVideoFrameBufferSize; + /* The "TOSHIBA Web Camera - 5M" Chicony device (04f2:b50b) seems to + * compute the bandwidth on 16 bits and erroneously sign-extend it to + * 32 bits, resulting in a huge bandwidth value. Detect and fix that + * condition by setting the 16 MSBs to 0 when they're all equal to 1. + */ + if ((ctrl->dwMaxPayloadTransferSize & 0xffff0000) == 0xffff0000) + ctrl->dwMaxPayloadTransferSize &= ~0xffff0000; + if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) && stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && stream->intf->num_altsetting > 1) { |