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usleep[_range] are finer precision implementations of msleep
and are designed to be drop-in replacements for udelay where
a precise sleep / busy-wait is unnecessary. They also allow
an easy interface to specify slack when a precise (ish)
wakeup is unnecessary to help minimize wakeups
As ACK'd upstream:
https://patchwork.kernel.org/patch/112813/
Change-Id: I277737744ca58061323837609b121a0fc9d27f33
Signed-off-by: Patrick Pannuto <ppannuto@codeaurora.org>
(cherry picked from commit 08c118890b06595dfc26d47ee63f59e73256c270)
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