On Thu, Oct 11, 2012 at 06:15:49PM -0700, Simon Glass wrote:
From: Gabe Black gabeblack@chromium.org
On x86, the i8042 keyboard controller driver frequently waits for the keyboard input buffer to be empty to make sure the controller has had a chance to process the data it was given. The way the delay loop was structured, if the controller hadn't cleared the corresponding status bit immediately, it would wait 1ms before checking again. If the keyboard responded quickly but not instantly, the driver would still wait a full 1ms when perhaps 1us would have been sufficient. Because udelay is a busy wait anyway, this change decreases the delay between checks to 1us.
Also, this change gets rid of a hardcoded 250ms delay.
On Stumpy, this saves 100-150ms during boot.
Signed-off-by: Gabe Black gabeblack@chromium.org Signed-off-by: Simon Glass sjg@chromium.org
This, or more precisely, v2 of 1/5 and 2/5 and v1 of 3, 4 and 5/5 have been applied to u-boot/master, thanks!