Re: [PATCH v2 4/5] thermal: bang-bang governor: act on lower trip boundary

From: Caesar Wang <wxt-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
To: Peter Feuerer <peter-p08lbbvQ7EI@public.gmane.org>
Cc: huangtao-TNX95d0MmH7DzftRWevZcw@public.gmane.org,
	Javi Merino <javi.merino-5wv7dgnIgG8@public.gmane.org>,
	Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>,
	linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
	dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	edubezval-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	smbarber-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	cf-TNX95d0MmH7DzftRWevZcw@public.gmane.org,
	briannorris-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	Zhang Rui <rui.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v2 4/5] thermal: bang-bang governor: act on lower trip boundary
Date: Wed, 25 May 2016 11:30:32 +0800	[thread overview]
Message-ID: <57451C58.6090808@rock-chips.com> (raw)
In-Reply-To: <a942e788aa285dcf88db38c6d03a36ce-wZNyVc2rXxoqcZcGjlUOXw@public.gmane.org>

On 2016年05月25日 01:34, Peter Feuerer wrote:
> Hi,
>
> 24. Mai 2016 15:06 Uhr, "Javi Merino" <javi.merino@arm.com> schrieb:
>> Ccing Peter Feuerer, author of the bang bang governor.
>>
>> On Tue, May 03, 2016 at 05:33:32PM +0800, Caesar Wang wrote:
>>
>>> From: Sascha Hauer <s.hauer@pengutronix.de>
>>>
>>> With interrupt driven thermal zones we pass the lower and upper
>>> temperature on which shall be acted, so in the governor we have to act on
>>> the exact lower temperature to be consistent. Otherwise an interrupt maybe
>>> generated on the exact lower temperature, but the bang bang governor does
>>> not react since The polling driven zones have to be one step cooler before
>>> the governor reacts.
>>>
>>> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
>>> Signed-off-by: Caesar Wang <wxt@rock-chips.com>
>>> Cc: Zhang Rui <rui.zhang@intel.com>
>>> Cc: Eduardo Valentin <edubezval@gmail.com>
>>> Cc: linux-pm@vger.kernel.org
> Acked-by: Peter Feuerer <peter@piie.net>

Okay, thanks your reviewing. :)

>
>
>>> ---
>>>
>>> Changes in v2:
>>> - Update the commit for patch[v2 4/5].
>>>
>>> drivers/thermal/gov_bang_bang.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
>>> index 70836c5..9d1dfea 100644
>>> --- a/drivers/thermal/gov_bang_bang.c
>>> +++ b/drivers/thermal/gov_bang_bang.c
>>> @@ -59,7 +59,7 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
>>> if (instance->target == 0 && tz->temperature >= trip_temp)
>>> instance->target = 1;
>>> else if (instance->target == 1 &&
>>> - tz->temperature < trip_temp - trip_hyst)
>>> + tz->temperature <= trip_temp - trip_hyst)
>>> instance->target = 0;
>>>
>>> dev_dbg(&instance->cdev->device, "target=%d\n",
>>> --
>>> 1.9.1
>>>
>>> --
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>
>

-- 
caesar wang | software engineer | wxt@rock-chip.com

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