Re: [PATCH v2 4/4] acerhdf: Use bang-bang thermal governor

Peter Feuerer
2014-04-29T16:43:13Z

Javi Merino writes:

> On Tue, Apr 29, 2014 at 10:17:57AM +0100, 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: Zhang Rui <rui.zhang@intel.com>
>> Cc: Andreas Mohr <andi@lisas.de>
>> Cc: Borislav Petkov <bp@suse.de>
>> Signed-off-by: Peter Feuerer <peter@piie.net>
>> ---
>> drivers/platform/x86/Kconfig | 2 +-
>> drivers/platform/x86/acerhdf.c | 48 +++++++++++++++++++++++++++++++++++-------
>> 2 files changed, 41 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
>> index 27df2c5..0c15d89 100644
>> --- a/drivers/platform/x86/Kconfig
>> +++ b/drivers/platform/x86/Kconfig
>> @@ -38,7 +38,7 @@ config ACER_WMI
>>
>> config ACERHDF
>> tristate "Acer Aspire One temperature and fan driver"
>> - depends on THERMAL && ACPI
>> + depends on ACPI && THERMAL_GOV_BANG_BANG
>> ---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 176edbd..f3884f9 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 "0.5.31"
>>
>> /*
>> * According to the Atom N270 datasheet,
>> @@ -135,8 +135,8 @@ struct bios_settings_t {
>> const char *vendor;
>> const char *product;
>> const char *version;
>> - unsigned char fanreg;
>> - unsigned char tempreg;
>> + u8 fanreg;
>> + u8 tempreg;
>> struct fancmd cmd;
>> int mcmd_enable;
>> };
>> @@ -259,6 +259,17 @@ 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",
>> + .no_hwmon = 0,
>> + .num_tbps = 0,
>> + .tbp = 0,
>> +};
>
> You don't need to initialize statics to 0. checkpatch only considers
> it an error if it finds it in a variable, but I think it also applies
> to fields in struct.

I agree, this is superfluous. I'll remove those lines.

>> +
>> static int acerhdf_get_temp(int *temp)
>> {
>> u8 read_temp;
>> @@ -436,6 +447,17 @@ static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip,
>> {
>> if (trip == 0)
>> *type = THERMAL_TRIP_ACTIVE;
>> + if (trip == 1)
>> + *type = THERMAL_TRIP_CRITICAL;
>
> This looks like an unrelated change that should be on a patch on its
> own.

Yes, will do so.

>> +
>> + return 0;
>> +}
>> +
>> +static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip,
>> + unsigned long *temp)
>> +{
>> + if (trip == 0)
>> + *temp = fanon - fanoff;
>>
>> return 0;
>> }
>> @@ -445,6 +467,8 @@ static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip,
>> {
>> if (trip == 0)
>> *temp = fanon;
>> + else if (trip == 1)
>> + *temp = ACERHDF_TEMP_CRIT;
>>
>> return 0;
>> }
>> @@ -464,8 +488,10 @@ 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,
>> + .notify = NULL,
>
> Same as before, no need to initialize static to NULL.

Ok, thanks.

--
kind regards,
--peter;