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PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped 

There is no real need to keep interrupt always-enabled, will be nicer
to keep it disabled while governor is inactive.

Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Dmitry Osipenko 2019-11-05 00:56:00 +03:00 committed by Chanwoo Choi
parent dccdea01ad
commit d49eeb1e83
1 changed files with 24 additions and 23 deletions
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47
drivers/devfreq/tegra30-devfreq.c
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@ -11,6 +11,7 @@
#include <linux/devfreq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
@ -416,8 +417,6 @@ static void tegra_actmon_start(struct tegra_devfreq *tegra)
{
unsigned int i;
disable_irq(tegra->irq);
actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
ACTMON_GLB_PERIOD_CTRL);
@ -442,8 +441,6 @@ static void tegra_actmon_stop(struct tegra_devfreq *tegra)
}
actmon_write_barrier(tegra);
enable_irq(tegra->irq);
}
static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
@ -552,6 +549,12 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,
{
struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
/*
* Couple devfreq-device with the governor early because it is
* needed at the moment of governor's start (used by ISR).
*/
tegra->devfreq = devfreq;
switch (event) {
case DEVFREQ_GOV_START:
devfreq_monitor_start(devfreq);
@ -586,10 +589,11 @@ static struct devfreq_governor tegra_devfreq_governor = {
static int tegra_devfreq_probe(struct platform_device *pdev)
{
struct tegra_devfreq *tegra;
struct tegra_devfreq_device *dev;
unsigned int i;
struct tegra_devfreq *tegra;
struct devfreq *devfreq;
unsigned long rate;
unsigned int i;
int err;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
@ -625,6 +629,16 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
}
tegra->irq = err;
irq_set_status_flags(tegra->irq, IRQ_NOAUTOEN);
err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
actmon_thread_isr, IRQF_ONESHOT,
"tegra-devfreq", tegra);
if (err) {
dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
return err;
}
reset_control_assert(tegra->reset);
err = clk_prepare_enable(tegra->clock);
@ -672,28 +686,15 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
}
tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
tegra->devfreq = devfreq_add_device(&pdev->dev,
&tegra_devfreq_profile,
"tegra_actmon",
NULL);
if (IS_ERR(tegra->devfreq)) {
err = PTR_ERR(tegra->devfreq);
devfreq = devfreq_add_device(&pdev->dev, &tegra_devfreq_profile,
"tegra_actmon", NULL);
if (IS_ERR(devfreq)) {
err = PTR_ERR(devfreq);
goto remove_governor;
}
err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
actmon_thread_isr, IRQF_ONESHOT,
"tegra-devfreq", tegra);
if (err) {
dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
goto remove_devfreq;
}
return 0;
remove_devfreq:
devfreq_remove_device(tegra->devfreq);
remove_governor:
devfreq_remove_governor(&tegra_devfreq_governor);