linux-kernel - Re: [PATCH 01/17] amba: Let runtime PM callbacks be available for CONFIG

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Message-ID: <CAPDyKFqaS1H0vT8KJgmhm35X4dB9dUHsqMXee9Eg3V3t6Dn+uQ@mail.gmail.com>
Date:	Wed, 19 Feb 2014 12:40:39 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alessandro Rubini <rubini@...pv.it>,
	Linus Walleij <linus.walleij@...aro.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Chris Ball <chris@...ntf.net>, Mark Brown <broonie@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH 01/17] amba: Let runtime PM callbacks be available for CONFIG_PM

On 19 February 2014 10:40, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Tue, Feb 04, 2014 at 04:58:42PM +0100, Ulf Hansson wrote:
>> Convert to the SET_PM_RUNTIME_PM macro while defining the runtime PM
>> callbacks. This means the callbacks becomes available for both
>> CONFIG_PM_SLEEP and CONFIG_PM_RUNTIME, which is needed by drivers and
>> power domains.
>
> This patch is wrong, because it causes build errors:
>
> drivers/amba/bus.c:126:18: error: 'pm_generic_suspend_late' undeclared here (not in a function)
> drivers/amba/bus.c:127:18: error: 'pm_generic_resume_early' undeclared here (not in a function)
> drivers/amba/bus.c:128:17: error: 'pm_generic_freeze_late' undeclared here (not in a function)
> drivers/amba/bus.c:129:16: error: 'pm_generic_thaw_early' undeclared here (not in a function)
> drivers/amba/bus.c:130:19: error: 'pm_generic_poweroff_late' undeclared here (not in a function)
> drivers/amba/bus.c:131:19: error: 'pm_generic_restore_early' undeclared here (not in a function)
>
> The failing configuration is:
>
> # CONFIG_SUSPEND is not set
> CONFIG_PM_RUNTIME=y
> CONFIG_PM=y
>

Thanks for spotting this! I thought I had tested all the various
combinations, but obvisouly not.

Anyway to add some more clarify; it is not this patch that causes the
issue. It's patch 2, which introduces the late/early callbacks.

Though the problem need to be fixed in the PM core,
pm_generic_suspend_late etc is not set to NULL for !CONFIG_PM_SLEEP,
they should. I guess we should put patch 2 on hold until, right?

Kind regards
Ulf Hansson

> --
> FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
> in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
> Estimate before purchase was "up to 13.2Mbit".
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