Hi,

I have a problem with the USB drivers.
My goal is to override the polling rate of a USB controller (joystick, high speed).
The requested rate is 8ms but I would like to poll it at 1ms.

I tried the suggestions here:
https://wiki.archlinux.org/index.php/Mouse_polling_rate

But this does not seem to work as the xhci drivers are used and not the ehci drivers.
The BIOS has no option to disable the USB 3.0 capabilities.

So I compiled an own kernel and now I'm trying to hardcode the polling rate to 1ms.
Note: I don't need a "clean" solution. For me also a hack would do as this machine uses USB only for USB game controllers (and a mouse/keyboard).

But I cannot find the right location. I thought I could change the polling rate in
'usb_parse_endpoint' but this does not work.
I set the 'endpoint->desc.interval' to 1 and I also put a 'printk' there to see that the line is executed but without success.
Still the polling rate is 8ms.

I tried the same in 'hid-core.c/usbhid_start:case HID_GD_JOYSTICK' but without any success.
It seems like the interval value is overwritten somewhere else.

Any help is appreciated.

(I am using the kernel 4.15.18, Ubuntu 16.04.)