linux-kernel - Re: [PATCH/RFC] platform_bus: Allow runtime PM by default

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Message-Id: <251AAFA3-F44D-40D2-BF99-E82EE58FD52D@opensource.wolfsonmicro.com>
Date:	Sat, 27 Mar 2010 19:41:40 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH/RFC] platform_bus: Allow runtime PM by default

On 26 Mar 2010, at 22:35, "Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Friday 26 March 2010, Mark Brown wrote:
>> Currently the default runtime PM callbacks for platform devices  
>> return
>> -ENOSYS, preventing the use of runtime PM platforms until they have
>> provided at least a default implementation. This hinders the use of
>> runtime PM by devices which work with many platforms such as memory
>> mapped devices, MFDs and on chip IPs shared by multiple  
>> architectures.
>>
>> Change the default implementation to the standard pm_generic_runtime
>> one, allowing drivers to use runtime PM without per-architecture
>> changes.
>>
>> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
>
> Acked-by: Rafael J. Wysocki <rjw@...k.pl>
>
> Is it very urgent?

Not especially - worst case you just don't get devices suspending  
which isn't the end of the world and there's no build time  
dependencies introduced.

>
> Rafael
>
>
>> ---
>>
>> I'm not 100% sure why the curret implementation returns -ENOSYS -  
>> I've
>> got a horrible feeling I might be breaking something somewhere.
>>
>> drivers/base/platform.c |    6 +++---
>> 1 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
>> index 43479a9..eb0f8d9 100644
>> --- a/drivers/base/platform.c
>> +++ b/drivers/base/platform.c
>> @@ -967,17 +967,17 @@ static int platform_pm_restore_noirq(struct  
>> device *dev)
>>
>> int __weak platform_pm_runtime_suspend(struct device *dev)
>> {
>> -    return -ENOSYS;
>> +    return pm_generic_runtime_suspend(dev);
>> };
>>
>> int __weak platform_pm_runtime_resume(struct device *dev)
>> {
>> -    return -ENOSYS;
>> +    return pm_generic_runtime_resume(dev);
>> };
>>
>> int __weak platform_pm_runtime_idle(struct device *dev)
>> {
>> -    return -ENOSYS;
>> +    return pm_generic_runtime_idle(dev);
>> };
>>
>> #else /* !CONFIG_PM_RUNTIME */
>>
>
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