linux-kernel - Re: [PATCH RFC 01/10] ARM: s3c64xx: pm: Use name field of generic_pm

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Date:	Sun, 12 Jan 2014 13:16:49 +0100
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Pavel Machek <pavel@....cz>
CC:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH RFC 01/10] ARM: s3c64xx: pm: Use name field of generic_pm_domain

Hi Pavel,

On 12.01.2014 12:47, Pavel Machek wrote:
> On Sat 2014-01-11 20:42:43, Tomasz Figa wrote:
>> This patch removes name field from private s3c64xx_pm_domain struct and
>> moves domain name to dedicated field of generic_pm_domain struct.
>>
>> When at it, beautify the names a bit, since they are used by genpd core
>> as message prefixes.
>>
>> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
>> ---
>>   arch/arm/mach-s3c64xx/pm.c | 19 +++++++++----------
>>   1 file changed, 9 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/arm/mach-s3c64xx/pm.c b/arch/arm/mach-s3c64xx/pm.c
>> index 8cdb824..5238d66 100644
>> --- a/arch/arm/mach-s3c64xx/pm.c
>> +++ b/arch/arm/mach-s3c64xx/pm.c
>> @@ -35,7 +35,6 @@
>>   #include "regs-syscon-power.h"
>>
>>   struct s3c64xx_pm_domain {
>> -	char *const name;
>>   	u32 ena;
>>   	u32 pwr_stat;
>>   	struct generic_pm_domain pd;
>> @@ -76,7 +75,7 @@ static int s3c64xx_pd_on(struct generic_pm_domain *domain)
>>   		} while (retry--);
>>
>>   		if (!retry) {
>> -			pr_err("Failed to start domain %s\n", pd->name);
>> +			pr_err("Failed to start domain %s\n", pd->pd.name);
>>   			return -EBUSY;
>>   		}
>
>
> So you changed text "failed to start domain I" to "failed to start
> domain domain_i". Not sure that's an improvement...?

Right. I apparently missed this, since this error should never happen 
unless there is something wrong with your hardware (SoC or PMIC).

Still, the generic code in drivers/base/power/domain.c does not add the 
"domain" prefix to the message. Without this patch it was printing 
messages like

I: Power-on latency exceeded, new value 1000 ns

I'd say that what's need adjustment are the messages in 
mach-s3c64xx/pm.c to print "%s: Failed to start\n" and keep things 
consistent with higher level code.

>
> Could we get some more descriptive names for the domains?

They are listed like this in user's manual, e.g. DOMAIN_F, DOMAIN_I, 
DOMAIN_G, etc.

Best regards,
Tomasz
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