[U-Boot] time: fix usec_to_tick()

[Tom Rini]

On Thu, Dec 05, 2013 at 12:08:09PM -0700, Stephen Warren wrote:

> From: Stephen Warren <swarren at nvidia.com>
> 
> Commit 8dfafdde88eb ("Introduce common timer functions") created a
> common definition of usec_to_tick() which had a couple problems:
> 
> static unsigned long long usec_to_tick(unsigned long usec)
> {
>        uint64_t tick = usec * get_tbclk();
> 
> That likely overflows.
> 
>        usec *= get_tbclk();
> 
> That was an attempt to fix it by performing the multiply after the
> promotion of usec to 64-bit, but was applied to the wrong variable,
> which was never used.
> 
> This patch fixes these issues. A user-visible symptom of the problem was
> the e.g. "dhcp zImage" using an ASIX USB Ethernet dongle would print:
> 
> Waiting for Ethernet connection... unable to connect.
> 
> ... with no delay before "unable to connect". There are likely other
> symptoms.
> 
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> Acked-by: Rob Herring <rob.herring at calxeda.com>

Applied to u-boot/master, thanks!

-- 
Tom
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