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

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Date:   Thu, 15 Jun 2017 22:52:59 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
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] clockevents/tcb_clksrc: implement suspend/resume

On 15/06/2017 21:40, Alexandre Belloni wrote:
> On 14/04/2017 at 21:13:36 +0200, Daniel Lezcano wrote:
>>> +void tc_clksrc_resume(struct clocksource *cs)
>>> +{
>>> +	int i;
>>> +
>>> +	for (i = 0; i < 3; i++) {
>>
>> s/3/ARRAY_SIZE(tcb_cache)/
>>
>>> +		__raw_writel(tcb_cache[i].cmr, tcaddr + ATMEL_TC_REG(i, CMR));
>>
>> Why __raw_writel?
>>
> 
> Ok, I got to the bottom of that question and I think it is worth
> answering it. __raw_{read,write}l were necessary to make the driver work
> on AVR32, because its core is BE and the IP LE and the regular
> readl/writel are (were) not doing the proper conversion.
> 
> This was supposed to be changed in a patch that was never applied:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/331775.html
> 
> But everything is fine, as AVR32 is now removed from the kernel. I think
> I'll switch the driver to regular readl/writel, using the _relaxed
> version in the hot path. Is that fine for you?

Yes.

> I'll also do so in the rework if at some point we can agree on some
> bindings, I'll try to address that soon too.

Ok, thanks.

  -- Daniel

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