linux-kernel - Re: [Patch v2 2/4] driver: cpuidle: cpuidle-big-little: init driver for Exynos5420

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Date:	Thu, 24 Apr 2014 13:17:07 +0530
From:	Chander Kashyap <chander.kashyap@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
	Chander Kashyap <k.chander@...sung.com>
Subject: Re: [Patch v2 2/4] driver: cpuidle: cpuidle-big-little: init driver
 for Exynos5420

On 23 April 2014 22:02, Lorenzo Pieralisi <lorenzo.pieralisi@....com> wrote:
> On Wed, Apr 23, 2014 at 10:25:52AM +0100, Chander Kashyap wrote:
>> Add "samsung,exynos5420" compatible string to initialize generic
>> big-little cpuidle driver for Exynos5420.
>>
>> Signed-off-by: Chander Kashyap <chander.kashyap@...aro.org>
>> Signed-off-by: Chander Kashyap <k.chander@...sung.com>
>> Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>  drivers/cpuidle/cpuidle-big_little.c |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
>> index b45fc62..d0fac53 100644
>> --- a/drivers/cpuidle/cpuidle-big_little.c
>> +++ b/drivers/cpuidle/cpuidle-big_little.c
>> @@ -170,7 +170,8 @@ static int __init bl_idle_init(void)
>>       /*
>>        * Initialize the driver just for a compliant set of machines
>>        */
>> -     if (!of_machine_is_compatible("arm,vexpress,v2p-ca15_a7"))
>> +     if (!of_machine_is_compatible("arm,vexpress,v2p-ca15_a7") &&
>> +             (!of_machine_is_compatible("samsung,exynos5420")))
>>               return -ENODEV;
>
> We should handle the string matching differently, we can't keep adding
> comparisons.

yes, that's true.


>
> Daniel raised the point already: what about the idle tables (data and
> number of states ?). TC2 has just a cluster state, and specific
> latencies, which are highly unlikely to be correct for this platform.
>

As of now only support for one state i.e. core power down.

As latencies are  concerned, need to fine tune.

Thanks again for the review.

> Lorenzo
>



-- 
with warm regards,
Chander Kashyap
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