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

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Date:	Wed, 25 May 2016 11:30:32 +0800
From:	Caesar Wang <wxt@...k-chips.com>
To:	Peter Feuerer <peter@...e.net>
CC:	Javi Merino <javi.merino@....com>, edubezval@...il.com,
	Heiko Stuebner <heiko@...ech.de>, dianders@...omium.org,
	briannorris@...gle.com, smbarber@...gle.com,
	linux-rockchip@...ts.infradead.org, cf@...k-chips.com,
	huangtao@...k-chips.com, dmitry.torokhov@...il.com,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] thermal: bang-bang governor: act on lower trip
 boundary


On 2016年05月25日 01:34, Peter Feuerer wrote:
> Hi,
>
> 24. Mai 2016 15:06 Uhr, "Javi Merino" <javi.merino@....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@...gutronix.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@...gutronix.de>
>>> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
>>> Cc: Zhang Rui <rui.zhang@...el.com>
>>> Cc: Eduardo Valentin <edubezval@...il.com>
>>> Cc: linux-pm@...r.kernel.org
> Acked-by: Peter Feuerer <peter@...e.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@...k-chip.com