linux-kernel - Re: [PATCH v2] clockevents/tcb_clksrc: implement suspend/resume

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Date:   Tue, 13 Jun 2017 14:28:00 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] clockevents/tcb_clksrc: implement suspend/resume

On 13/06/2017 at 14:21:10 +0200, Daniel Lezcano wrote:
> On 12/05/2017 20:22, Alexandre Belloni wrote:
> > On sama5d2, power to the core may be cut while entering suspend mode. It is
> > necessary to save and restore the TCB registers.
> > 
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> 
> The context will be saved/restored on all the platforms (other than
> sama5d2) using this timer even if the clock is not powered down. Is that ok?
> 

Yes, that is fine. There is not much we can do here until we can
determine what is the target suspend state from the drivers.

> Should it be tagged for stable@?
> 

No because support for this suspend mode is not yet upstream.

> Side note: the config option is in drivers/misc, any particular reason
> to have it there and not in the clocksource's Kconfig?
> 

Mostly historical, this is changed in the other series.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com