From: Brian Norris <computersforpeace@gmail.com>
Date: Wed, 17 Dec 2014 03:13:50 +0000 (-0800)
Subject: ARM: brcmstb: update CPU power management sequence
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~71^2~27^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a1ad3b94a7661b643fef2efbc6fc217bd148f462;p=pandora-kernel.git

ARM: brcmstb: update CPU power management sequence

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: 62639c2f5332 ("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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