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The cpu_relax() function can be a noop on certain architectures like
IA-64 when CPU threads are disabled, so use msleep instead during link
retraining busy/wait loop.
Introduce define LINK_RETRAIN_TIMEOUT instead of hard-coding timeout in
pcie_aspm_configure_common_clock.
Use time_after() to avoid jiffy wraparound when checking for expired
timeout.
After timeout expires, recheck link status register link training bit
instead of checking for expired timeout to avoid possible false
positive.
Note that Matthew Wilcox came up with the first rough version of this
patch.
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
987a4c783a