[U-Boot] xyz-modem: Change getc timeout loop waiting

[Tom Rini]

On Mon, Nov 21, 2016 at 10:18:51AM +0200, tomas.melin at vaisala.com wrote:

> This fixes the loop delay when using a hw watchdog.
> 
> In case a watchdog is used that accesses CPU registers,
> the defined delay of 20us in a tight loop will cause a
> huge delay in the actual timeout seen. This is caused
> by the fact that udelay will inheritantly call WATCHDOG_RESET.
> Together with the omap wdt implementation, the seen timeout increases up to
> around 30s. This makes the loop very slow and causes long
> delays when using the modem.
> 
> Instead, implement the 2 sec loop by using the timer interface to know
> when to break out of the timeout loop. Watchdog kicking is taken care of
> by getc().
> 
> Signed-off-by: Tomas Melin <tomas.melin at vaisala.com>

Applied to u-boot/master, thanks!

-- 
Tom
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