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Subject: media: uvcvideo: Fix the bandwdith quirk on USB 3.x Author: Michal Pecio <michal.pe...@gmail.com> Date: Sun Apr 14 19:00:40 2024 +0200 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.pe...@gmail.com> Reviewed-by: Ricardo Ribalda <riba...@chromium.org> Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com> Link: https://lore.kernel.org/r/20240414190040.2255a0bc@foxbook Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com> drivers/media/usb/uvc/uvc_video.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 4dfc1b86bdee..cd9c29532fb0 100644 --- 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;
