linux-kernel - Re: [PATCH 07/10] ARM: OMAP5 / DRA7: Enable CPU RET on suspend

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Date:	Wed, 27 Aug 2014 14:45:21 -0500
From:	Nishanth Menon <nm@...com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Tony Lindgren <tony@...mide.com>
CC:	Kevin Hilman <khilman@...prootsystems.com>,
	Tero Kristo <t-kristo@...com>, Paul Walmsley <paul@...an.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Keerthy <j-keerthy@...com>,
	Benoît Cousson <bcousson@...libre.com>
Subject: Re: [PATCH 07/10] ARM: OMAP5 / DRA7: Enable CPU RET on suspend

On 08/27/2014 02:43 PM, Santosh Shilimkar wrote:
> On Wednesday 27 August 2014 03:41 PM, Tony Lindgren wrote:
>> * Nishanth Menon <nm@...com> [140827 12:05]:
>>> On 08/27/2014 01:58 PM, Kevin Hilman wrote:
>>>> Nishanth Menon <nm@...com> writes:
>>>>
>>>>> From: Rajendra Nayak <rnayak@...com>
>>>>>
>>>>> On OMAP5 / DRA7, prevent a CPU powerdomain OFF and resulting MPU OSWR
>>>>> and instead attempt a CPU RET and side effect, MPU RET in suspend.
>>>>>
>>>>> Signed-off-by: Rajendra Nayak <rnayak@...com>
>>>>> [nm@...com: update to do save_state only on DRA7]
>>>>> Signed-off-by: Nishanth Menon <nm@...com>
>>>>> ---
>>>>>  arch/arm/mach-omap2/omap-mpuss-lowpower.c |    4 ++++
>>>>>  arch/arm/mach-omap2/omap-wakeupgen.c      |    2 +-
>>>>>  arch/arm/mach-omap2/pm44xx.c              |    9 +++++++--
>>>>>  3 files changed, 12 insertions(+), 3 deletions(-)
>>>>>
>>>>> diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
>>>>> index 207fce2..0d640eb 100644
>>>>> --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
>>>>> +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
>>>>> @@ -242,6 +242,10 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
>>>>>  		save_state = 1;
>>>>>  		break;
>>>>>  	case PWRDM_POWER_RET:
>>>>> +		if (soc_is_omap54xx() || soc_is_dra7xx()) {
>>>>
>>>> Aren't we trying to get away from these soc_* checks for anything other
>>>> than init code?
>>>
>>> I would expect that to take place in stages as part of which the next
>>> level of cleanup is to move PRM into drivers. Currently our wakeupgen,
>>> prm code does have quiet a few needs of dealing with soc_is checks
>>> primarily from having to re-architect code in two different directions
>>> - we want to move into just one direction eventually - to prm drivers
>>> and as less code in mach-omap2 which is already in the works.
>>
>> Why don't you just set some flag at init time based on the
>> soc_is check and then test that here? That limits the use of
>> soc_is to init code only which makes it easier to phase it
>> out completely eventually.
>>
> Indeed. Infact the version of the code I tried posting last year was
> using a flag which was initialised during init. Same can be
> done her.

OK. will try something along that line in the next rev.


-- 
Regards,
Nishanth Menon
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