Subject: [PATCHv3 4/6] ARM: OMAP3 PM: Enable IO Wake up

From: [email-masked] (Rajendra Nayak)
Date: Fri, 02 Mar 2012 14:53:45 +0530

On Friday 02 March 2012 02:49 PM, Tero Kristo wrote:
> On Thu, 2012-03-01 at 14:37 -0800, Kevin Hilman wrote:
>> Rajendra Nayak<[email-masked]>  writes:
>>
>>> On Wednesday 29 February 2012 07:56 PM, Tero Kristo wrote:
>>>> From: Vishwanath BS<[email-masked]>
>>>>
>>>> Enable IO Wake up for OMAP3 as part of PM Init. Currently this has been
>>>> managed in cpuidle path which is not the right place. Subsequent patch
>>>> will remove IO Daisy chain handling in cpuidle path once daisy chain is
>>>> handled as part of hwmod mux.
>>>>
>>>> Signed-off-by: Vishwanath BS<[email-masked]>
>>>> Tested-by: Govindraj.R<[email-masked]>
>>>> Signed-off-by: Tero Kristo<[email-masked]>
>>>> ---
>>>>    arch/arm/mach-omap2/pm34xx.c |    4 ++++
>>>>    1 files changed, 4 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
>>>> index e97ec3f..e6c2d39 100644
>>>> --- a/arch/arm/mach-omap2/pm34xx.c
>>>> +++ b/arch/arm/mach-omap2/pm34xx.c
>>>> @@ -793,6 +793,10 @@ static int __init omap3_pm_init(void)
>>>>    		goto err1;
>>>>    	}
>>>>
>>>> +	if (omap3_has_io_wakeup())
>>>> +		omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
>>>> +					   PM_WKEN);
>>>
>>> On OMAP4 this GLOBAL IO chain enable happens as part of the trigger
>>> function itself, it might make sense to do that for OMAP3 too to avoid
>>> similar issues as seen on OMAP4 when the GLOBAL switch is enabled too
>>> late in boot. The best however would be to get rid of it in the trigger
>>> function and enable this early during PM init, but I am not sure whats
>>> a good place to do this 'early' enough.
>>
>> What about the subsys_initcall() that's already in the prm*.c files?
>>
>> IMO, the global one-time init doesn't belong in the trigger function
>> because there's no need to do the extra PRM read/write when it should be
>> a one-shot init.
>
> This sounds good to me at least, I can change the patches to work like
> this, Rajendra?

Yup, sounds good to me too. The extra PRM read/write is really an
overhead when done for every trigger. Thanks Kevin.

> -Tero