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Message-ID: <alpine.LFD.2.11.1506251237000.2617@knanqh.ubzr>
Date: Thu, 25 Jun 2015 12:42:56 -0400 (EDT)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
cc: Paul Osmialowski <pawelo@...g.net.pl>,
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Subject: Re: [PATCH 3/9] arm: add call to CPU idle quirks handler
On Tue, 23 Jun 2015, Arnd Bergmann wrote:
> On Tuesday 23 June 2015 23:19:41 Paul Osmialowski wrote:
> > Some SoCs need additional actions to be performed after arch idle,
> > e.g. Kinetis requires invalidation of the I/D bus cache.
> >
> > Such handler could be held in provided <mach/idle.h> header file.
> >
> > Signed-off-by: Paul Osmialowski <pawelo@...g.net.pl>
> > ---
> > arch/arm/Kconfig | 7 +++++++
> > arch/arm/kernel/process.c | 7 +++++++
> > 2 files changed, 14 insertions(+)
> >
> > diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> > index 8e3a833..8ef8f8f 100644
> > --- a/arch/arm/Kconfig
> > +++ b/arch/arm/Kconfig
> > @@ -98,6 +98,13 @@ config ARM_HAS_SG_CHAIN
> > config NEED_SG_DMA_LENGTH
> > bool
> >
> > +config NEED_MACH_IDLE_H
> > + bool
> > +
> > +config ARM_CPU_IDLE_QUIRKS
> > + bool
> > + select NEED_MACH_IDLE_H
> > +
>
> We're not adding header files like this, please come up
> with another solution. How about a cpuidle driver, or
> possibly just overriding arm_pm_idle()?
If the WFI instruction always requires I and D flushing, then it might
be a better idea to provide a replacement for the corresponding
cpu_*_do_idle function. Plenty of examples exist for other cpu_*
functions.
Nicolas
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