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Commit 217b9b11 authored by Saravana Kannan's avatar Saravana Kannan Committed by Stephen Boyd
Browse files

PM / devfreq: devbw: Add suspend/resume APIs 



Absence of traffic is guaranteed when the device sitting behind a devbw
device is suspended. In such cases, it is a waste of power to make non-zero
bandwidth votes or to scale the devbw device. So, provide APIs to
suspend/resume the devbw device as needed.

Change-Id: Id58072aec7a9710eb917f248d9b9bd08d3a1ec6a
Signed-off-by: default avatarSaravana Kannan <skannan@codeaurora.org>
parent cddae1b0

drivers/devfreq/bimc-bwmon.c

+11 −4
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -237,7 +237,6 @@ static void stop_bw_hwmon(struct bw_hwmon *hw) 
{

	struct bwmon *m = to_bwmon(hw);



	disable_irq(m->irq);

	free_irq(m->irq, m);

	mon_disable(m);

	mon_irq_disable(m);
@@ -249,7 +248,7 @@ static int suspend_bw_hwmon(struct bw_hwmon *hw) 
{

	struct bwmon *m = to_bwmon(hw);



	disable_irq(m->irq);

	free_irq(m->irq, m);

	mon_disable(m);

	mon_irq_disable(m);

	mon_irq_clear(m);
@@ -260,11 +259,19 @@ static int suspend_bw_hwmon(struct bw_hwmon *hw) 
static int resume_bw_hwmon(struct bw_hwmon *hw)

{

	struct bwmon *m = to_bwmon(hw);

	int ret;



	mon_clear(m);

	mon_irq_enable(m);

	mon_enable(m);

	enable_irq(m->irq);

	ret = request_threaded_irq(m->irq, NULL, bwmon_intr_handler,

				  IRQF_ONESHOT | IRQF_SHARED,

				  dev_name(m->dev), m);

	if (ret) {

		dev_err(m->dev, "Unable to register interrupt handler! (%d)\n",

				ret);

		return ret;

	}



	return 0;

}

drivers/devfreq/devfreq_devbw.c

+19 −5
Original line number Diff line number Diff line
@@ -214,11 +214,6 @@ int devfreq_add_devbw(struct device *dev) 
	return 0;

}



static int devfreq_devbw_probe(struct platform_device *pdev)

{

	return devfreq_add_devbw(&pdev->dev);

}



int devfreq_remove_devbw(struct device *dev)

{

	struct dev_data *d = dev_get_drvdata(dev);
@@ -228,6 +223,25 @@ int devfreq_remove_devbw(struct device *dev) 
	return 0;

}



int devfreq_suspend_devbw(struct device *dev)

{

	struct dev_data *d = dev_get_drvdata(dev);



	return devfreq_suspend_device(d->df);

}



int devfreq_resume_devbw(struct device *dev)

{

	struct dev_data *d = dev_get_drvdata(dev);



	return devfreq_resume_device(d->df);

}



static int devfreq_devbw_probe(struct platform_device *pdev)

{

	return devfreq_add_devbw(&pdev->dev);

}



static int devfreq_devbw_remove(struct platform_device *pdev)

{

	return devfreq_remove_devbw(&pdev->dev);

include/soc/qcom/devfreq_devbw.h

+10 −0
Original line number Diff line number Diff line
@@ -19,6 +19,8 @@ 
#ifdef CONFIG_MSM_DEVFREQ_DEVBW

int devfreq_add_devbw(struct device *dev);

int devfreq_remove_devbw(struct device *dev);

int devfreq_suspend_devbw(struct device *dev);

int devfreq_resume_devbw(struct device *dev);

#else

static inline int devfreq_add_devbw(struct device *dev)

{
@@ -28,6 +30,14 @@ static inline int devfreq_remove_devbw(struct device *dev) 
{

	return 0;

}

static inline int devfreq_suspend_devbw(struct device *dev)

{

	return 0;

}

static inline int devfreq_resume_devbw(struct device *dev)

{

	return 0;

}

#endif



#endif /* _DEVFREQ_DEVBW_H */