ARM: brcmstb: update CPU power management sequence

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The automatic CPU power state machine for B15 CPUs does not work
reliably as-is. This patch implements a manual sequence in software to
replace it.

This was tested successfully with over 10,000 hotplug cycles of
something like this:

  echo 0 > /sys/devices/system/cpu/cpu1/online
  echo 1 > /sys/devices/system/cpu/cpu1/online

whereas the existing sequence often locks up after a few hundred cycles.

Fixes: 62639c2f53 ("ARM: brcmstb: reintroduce SMP support")
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

...

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Brian Norris 2014-12-16 19:13:50 -08:00 • committed by Florian Fainelli

parent 97bf6af1f9

commit a1ad3b94a7

1 changed files with 63 additions and 22 deletions

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arch/arm/mach-bcm/platsmp-brcmstb.c

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