tree 27c4e7f1a858af09f8d85d3669fca72175a9e632
parent 33da95aadcfb5d745952c278cfef3f1ee4a79d29
author Thomas Watson <twatson52@icloud.com> 1644527594 -0600
committer Marek Vasut <marex@denx.de> 1644534228 +0100

console: usb: kbd: Limit poll frequency to improve performance

Using the XHCI driver, the function `usb_kbd_poll_for_event` takes
30-40ms to run. The exact time is dependent on the polling interval the
keyboard requests in its descriptor, and likely cannot be significantly
reduced without major rework to the XHCI driver.

The U-Boot EFI console service sets a timer to poll the keyboard every 5
microseconds, and this timer is checked every time a block is read off
disk. The net effect is that, on my system, loading a ~40MiB kernel and
initrd takes about 62 seconds with a slower keyboard and 53 seconds
with a faster one, with the vast majority of the time spent polling the
keyboard.

To solve this problem, this patch adds a 20ms delay between consecutive
calls to `usb_kbd_poll_for_event`. This is sufficient to reduce the
total loading time to under half a second for both keyboards, and does
not impact the perceived keystroke latency.

Signed-off-by: Thomas Watson <twatson52@icloud.com>