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devfreq_cooling: pass a pointer to devfreq in the power model callbacks 

When the devfreq cooling device was designed, it was an oversight not to
pass a pointer to the struct devfreq as the first parameters of the
callbacks.  The design patterns of the kernel suggest it for a good
reason.

By passing a pointer to struct devfreq, the driver can register one
function that works with multiple devices.  With the current
implementation, a driver that can work with multiple devices has to
create multiple copies of the same function with different parameters so
that each devfreq_cooling_device can use the appropriate one.  By
passing a pointer to struct devfreq, the driver can identify which
device it's referring to.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Ørjan Eide <orjan.eide@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Javi Merino 2016-09-15 15:44:23 +01:00 committed by Zhang Rui
parent 1cea4e7776
commit 3aa5374376
2 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/thermal/devfreq_cooling.c
View File

@ -238,7 +238,7 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
return 0;
}
return dfc->power_ops->get_static_power(voltage);
return dfc->power_ops->get_static_power(df, voltage);
}
/**
@ -262,7 +262,8 @@ get_dynamic_power(struct devfreq_cooling_device *dfc, unsigned long freq,
struct devfreq_cooling_power *dfc_power = dfc->power_ops;
if (dfc_power->get_dynamic_power)
return dfc_power->get_dynamic_power(freq, voltage);
return dfc_power->get_dynamic_power(dfc->devfreq, freq,
voltage);
freq_mhz = freq / 1000000;
power = (u64)dfc_power->dyn_power_coeff * freq_mhz * voltage * voltage;

6
include/linux/devfreq_cooling.h
View File

@ -36,8 +36,10 @@
* @dyn_power_coeff * frequency * voltage^2
*/
struct devfreq_cooling_power {
unsigned long (*get_static_power)(unsigned long voltage);
unsigned long (*get_dynamic_power)(unsigned long freq,
unsigned long (*get_static_power)(struct devfreq *devfreq,
unsigned long voltage);
unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
unsigned long freq,
unsigned long voltage);
unsigned long dyn_power_coeff;
};