This is a note to let you know that I've just added the patch titled
media: uvcvideo: Fix the bandwdith quirk on USB 3.x
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-uvcvideo-fix-the-bandwdith-quirk-on-usb-3.x.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 66ce8e0753aa7669e26cb378f3d2effe9c2e11b9
Author: Michal Pecio <michal.pecio@xxxxxxxxx>
Date: Sun Apr 14 19:00:40 2024 +0200
media: uvcvideo: Fix the bandwdith quirk on USB 3.x
[ Upstream commit 9e3d55fbd160b3ca376599a68b4cddfdc67d4153 ]
The bandwidth fixup quirk doesn't know that SuperSpeed exists and has
the same 8 service intervals per millisecond as High Speed, hence its
calculations are wrong.
Assume that all speeds from HS up use 8 intervals per millisecond.
No further changes are needed, updated code has been confirmed to work
with all speeds from FS to SS.
Signed-off-by: Michal Pecio <michal.pecio@xxxxxxxxx>
Reviewed-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240414190040.2255a0bc@foxbook
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 9a4c730943a90..288f097e2e6f2 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -207,13 +207,13 @@ static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
/* Compute a bandwidth estimation by multiplying the frame
* size by the number of video frames per second, divide the
* result by the number of USB frames (or micro-frames for
- * high-speed devices) per second and add the UVC header size
- * (assumed to be 12 bytes long).
+ * high- and super-speed devices) per second and add the UVC
+ * header size (assumed to be 12 bytes long).
*/
bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp;
bandwidth *= 10000000 / interval + 1;
bandwidth /= 1000;
- if (stream->dev->udev->speed == USB_SPEED_HIGH)
+ if (stream->dev->udev->speed >= USB_SPEED_HIGH)
bandwidth /= 8;
bandwidth += 12;
