linux-kernel - Re: [PATCH v2 5/5] clocksource: sun5i: Add clock notifiers

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Message-ID: <54F6EFFD.5070802@linaro.org>
Date:	Wed, 04 Mar 2015 12:43:57 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 5/5] clocksource: sun5i: Add clock notifiers

On 03/04/2015 10:32 AM, Maxime Ripard wrote:
> On Tue, Mar 03, 2015 at 12:16:57PM +0100, Daniel Lezcano wrote:
>> On 03/03/2015 09:52 AM, Maxime Ripard wrote:
>>> On Mon, Jan 26, 2015 at 03:35:41PM +0100, Maxime Ripard wrote:
>>>>>> +static int sun5i_rate_cb_clksrc(struct notifier_block *nb,
>>>>>> +				unsigned long event, void *data)
>>>>>> +{
>>>>>> +	struct clk_notifier_data *ndata = data;
>>>>>> +	struct sun5i_timer *timer = to_sun5i_timer(nb);
>>>>>> +	struct sun5i_timer_clksrc *cs = container_of(timer,
>>>>>> +						     struct sun5i_timer_clksrc, timer);
>>>>>> +
>>>>>> +	switch (event) {
>>>>>> +	case PRE_RATE_CHANGE:
>>>>>> +		clocksource_unregister(&cs->clksrc);
>>>>>> +		break;
>>>>>> +
>>>>>> +	case POST_RATE_CHANGE:
>>>>>> +		clocksource_register_hz(&cs->clksrc, ndata->new_rate);
>>>>>> +		break;
>>>>>
>>>>> Why clocksource_unregister couldn't be in the POST_RATE_CHANGE ?
>>>>
>>>> Wouldn't that leave a (small, I agree) window where the timer would
>>>> run at a rate different to the one it has been registered with?
>>>
>>> Ping?
>>
>> Hi Maxime,
>>
>> except I missed something, there were a couple of comments and I was waiting
>> a V3.
>
> Indeed, but one of these comments (the one above) was still under
> discussion.

Ah, yeah. Fair enough :)



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