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powerpc/powernv: Add OPAL call to resync timebase on wakeup

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During "Fast-sleep" and deeper power savings state, decrementer and
timebase could be stopped making it out of sync with rest
of the cores in the system.

Add a firmware call to request platform to resync timebase
using low level platform methods.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vaidyanathan Srinivasan
2014-02-26 05:38:43 +05:30
committed by Benjamin Herrenschmidt
parent aca79d2b6e
commit 97eb001f03
4 changed files with 31 additions and 1 deletions
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2
arch/powerpc/kernel/exceptions-64s.S
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@@ -145,7 +145,7 @@ BEGIN_FTR_SECTION
/* Fast Sleep wakeup on PowerNV */
8: GET_PACA(r13)
b .power7_wakeup_loss
b .power7_wakeup_tb_loss
9:
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)