[PATCH 1/2] powerpc/timer - large decrementer support

Balbir Singh bsingharora at gmail.com
Fri Jun 3 12:01:56 AEST 2016



On 01/06/16 15:28, Michael Neuling wrote:
> On Tue, 2016-05-31 at 17:16 +1000, Oliver O'Halloran wrote:
>> POWER ISA v3 adds large decrementer (LD) mode of operation which
>> increases
>> the size of the decrementer register from 32 bits to an implementation
>> defined with of up to 64 bits.
>>
>> This patch adds support for the LD on processors with the
>> CPU_FTR_ARCH_300
>> cpu feature flag set. For CPUs with this feature LD mode is enabled when
>> when the ibm,dec-bits devicetree property is supplied for the boot CPU.
>> The
>> decrementer value is a signed quantity (with negative values indicating a
>> pending exception) and this property is required to find the maximum
>> positive decrementer value. If this property is not supplied then the
>> traditional decrementer width of 32 bits is assumed and LD mode is
>> disabled.
>>
>> This patch was based on initial work by Jack Miller.
>>
>> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
>> Cc: Michael Neuling <mikey at neuling.org>
> 
> Acked-by: Michael Neuling <mikey at neuling.org>
> 
>> Cc: Balbir Singh <bsingharora at gmail.com>
>> Cc: Jack Miller <jack at codezen.org>

I had reviewed a previous post of this patchset

Reviewed-by: Balbir Singh <bsingharora at gmail.com>


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