cpufreq: intel_pstate: Enable HWP during system resume on CPU0

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[ Upstream commit 70f6bf2a3b ]

When maxcpus=1 is in the kernel command line, the BP is responsible
for re-enabling the HWP - because currently only the APs invoke
intel_pstate_hwp_enable() during their online process - which might
put the system into unstable state after resume.

Fix this by enabling the HWP explicitly on BP during resume.

Reported-by: Doug Smythies <dsmythies@telus.net>
Suggested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Yu Chen <yu.c.chen@intel.com>
[ rjw: Subject/changelog, minor modifications ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Chen Yu 2018-01-29 10:27:57 +08:00 • committed by Greg Kroah-Hartman

parent c4c9fd5589

commit ae9c78af57

1 changed files with 5 additions and 0 deletions

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drivers/cpufreq/intel_pstate.c

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