linux-kernel - Re: [PATCH v5 4/6] acerhdf: Use bang-bang thermal governor

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Date:	Wed, 27 Aug 2014 10:01:04 +0200
From:	Peter Feuerer <peter@...e.net>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andreas Mohr <andi@...as.de>, Javi Merino <javi.merino@....com>
Subject: Re: [PATCH v5 4/6] acerhdf: Use bang-bang thermal governor

Zhang Rui writes:

> On Tue, 2014-07-22 at 17:37 +0200, Peter Feuerer wrote:
>> acerhdf has been doing an on-off fan control using hysteresis by
>> post-manipulating the outcome of thermal subsystem trip point handling.
>> This patch enables acerhdf to use the bang-bang governor, which is
>> intended for on-off controlled fans.
>> 
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> CC: Zhang Rui <rui.zhang@...el.com>
>> Cc: Andreas Mohr <andi@...as.de>
>> Cc: Javi Merino <javi.merino@....com>
>> Acked-and-tested-by: Borislav Petkov <bp@...e.de>
>> Signed-off-by: Peter Feuerer <peter@...e.net>
> 
> Peter,
> 
> will you take this patch, or do you want me to take this patch along
> with Patch 3/6?

Hi Rui,

please apply the whole series.  I don't have a git repository where Linus 
pulls from.

thanks and kind regards,
--peter;


> 
> thanks,
> rui
>> ---
>>  drivers/platform/x86/Kconfig   |  3 ++-
>>  drivers/platform/x86/acerhdf.c | 36 +++++++++++++++++++++++++++++++-----
>>  2 files changed, 33 insertions(+), 6 deletions(-)
>> 
>> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
>> index 172f26c..b5e80dc 100644
>> --- a/drivers/platform/x86/Kconfig
>> +++ b/drivers/platform/x86/Kconfig
>> @@ -38,7 +38,8 @@ config ACER_WMI
>>  
>>  config ACERHDF
>>  	tristate "Acer Aspire One temperature and fan driver"
>> -	depends on THERMAL && ACPI
>> +	select THERMAL_GOV_BANG_BANG
>> +	depends on ACPI
>>  	---help---
>>  	  This is a driver for Acer Aspire One netbooks. It allows to access
>>  	  the temperature sensor and to control the fan.
>> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
>> index f30767f..7fe7dbf 100644
>> --- a/drivers/platform/x86/acerhdf.c
>> +++ b/drivers/platform/x86/acerhdf.c
>> @@ -50,7 +50,7 @@
>>   */
>>  #undef START_IN_KERNEL_MODE
>>  
>> -#define DRV_VER "0.5.30"
>> +#define DRV_VER "0.7.0"
>>  
>>  /*
>>   * According to the Atom N270 datasheet,
>> @@ -258,6 +258,14 @@ static const struct bios_settings_t bios_tbl[] = {
>>  
>>  static const struct bios_settings_t *bios_cfg __read_mostly;
>>  
>> +/*
>> + * this struct is used to instruct thermal layer to use bang_bang instead of
>> + * default governor for acerhdf
>> + */
>> +static struct thermal_zone_params acerhdf_zone_params = {
>> +	.governor_name = "bang_bang",
>> +};
>> +
>>  static int acerhdf_get_temp(int *temp)
>>  {
>>  	u8 read_temp;
>> @@ -439,6 +447,17 @@ static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
>>  	return 0;
>>  }
>>  
>> +static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
>> +				 unsigned long *temp)
>> +{
>> +	if (trip != 0)
>> +		return -EINVAL;
>> +
>> +	*temp = fanon - fanoff;
>> +
>> +	return 0;
>> +}
>> +
>>  static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
>>  				 unsigned long *temp)
>>  {
>> @@ -463,6 +482,7 @@ static struct thermal_zone_device_ops acerhdf_dev_ops = {
>>  	.get_mode = acerhdf_get_mode,
>>  	.set_mode = acerhdf_set_mode,
>>  	.get_trip_type = acerhdf_get_trip_type,
>> +	.get_trip_hyst = acerhdf_get_trip_hyst,
>>  	.get_trip_temp = acerhdf_get_trip_temp,
>>  	.get_crit_temp = acerhdf_get_crit_temp,
>>  };
>> @@ -515,9 +535,7 @@ static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
>>  	}
>>  
>>  	if (state == 0) {
>> -		/* turn fan off only if below fanoff temperature */
>> -		if ((cur_state == ACERHDF_FAN_AUTO) &&
>> -		    (cur_temp < fanoff))
>> +		if (cur_state == ACERHDF_FAN_AUTO)
>>  			acerhdf_change_fanstate(ACERHDF_FAN_OFF);
>>  	} else {
>>  		if (cur_state == ACERHDF_FAN_OFF)
>> @@ -696,11 +714,19 @@ static int acerhdf_register_thermal(void)
>>  		return -EINVAL;
>>  
>>  	thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
>> -					      &acerhdf_dev_ops, NULL, 0,
>> +					      &acerhdf_dev_ops,
>> +					      &acerhdf_zone_params, 0,
>>  					      (kernelmode) ? interval*1000 : 0);
>>  	if (IS_ERR(thz_dev))
>>  		return -EINVAL;
>>  
>> +	if (strcmp(thz_dev->governor->name,
>> +				acerhdf_zone_params.governor_name)) {
>> +		pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
>> +				acerhdf_zone_params.governor_name);
>> +		return -EINVAL;
>> +	}
>> +
>>  	return 0;
>>  }
>>  
> 
> 
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