On Wed, 2013-01-23 at 16:38 +0800, Wolfgang Denk wrote:
Dear Jim Lin,
In message 1358923034-2727-1-git-send-email-jilin@nvidia.com you wrote:
Autoboot timeout defined by CONFIG_BOOTDELAY will not be accurate if CONFIG_USB_KEYBOARD and CONFIG_SYS_USB_EVENT_POLL are defined in configuration file and when tstc() function for checking key pressed takes longer time than 10 ms (e.g., 50 ms) to finish.
...
/* delay 100 * 10ms */
for (i=0; !abort && i<100; ++i) {
j = 100;for (i = 0; !abort && i < j; ++i) {ts = get_timer(0); if (tstc()) { /* we got a key press */ abort = 1; /* don't auto boot */ bootdelay = 0; /* no more delay */@@ -263,7 +266,11 @@ int abortboot(int bootdelay) # endif break; }
udelay(10000);
ts = get_timer(ts);if (ts < 10)mdelay(10 - ts);elsej = 1000 / (int) ts;This is a pretty awkward implementation. If you feel the current plain delay loop based approach is not exact enough, then please implement a real timeout - you are calling the timer anyway, so just use the timer values instead of a loop count.
Thanks for pointing this out. I will improve it and resend.
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