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

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Date:	Tue, 24 May 2016 17:34:58 +0000
From:	"Peter Feuerer" <peter@...e.net>
To:	"Javi Merino" <javi.merino@....com>,
	"Caesar Wang" <wxt@...k-chips.com>
Cc:	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

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>


>> 
>> ---
>> 
>> 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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