Kenji Chen be2ed33b19 EC: Ensure the udelay function waits at least the time indicated. ...

Udelay function might get delay less than the time indicated by the 
input parameter. udelay(4) sometimes get the tick like, 6->7->7->
8->8->9->A and then the udelay return. But, the sampling point of 6 
could be at the end of 6(close to 7) and the point of A could be 
right at the beginning of A(close to A). This function could get 
delay from (us - 1) to (us + 1). This change is to ensure the delay 
at least over the parameter, us.

BRANCH=master
BUG=None
TEST=Build an EC FW iamge and run on Rambi to ensure at the time
duration indicated by the parameter is elaspsed and satisfied.
Signed-off-by: Kenji Chen <kenji.chen@intel.com>
Change-Id: I797f80c577d7e29e75a304aec1e02d2c750f8a23
Reviewed-on: https://chromium-review.googlesource.com/224660
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Mohammed Habibulla <moch@chromium.org>

2014-10-23 22:41:08 +00:00

6.1 KiB

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