media: uvcvideo: Fix the bandwdith quirk on USB 3.x

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@gmail.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240414190040.2255a0bc@foxbook
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 4dfc1b86bdee8f338a77f0feaa13dd5b0d67b030..cd9c29532fb031bd1e19c2946767a9bc05f711d1 100644 (file)
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -214,13 +214,13 @@ 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;