[v6,02/19] PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped
diff mbox series

Message ID 20190811212315.12689-3-digetx@gmail.com
State New
Headers show
Series
  • More improvements for Tegra30 devfreq driver
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Commit Message

Dmitry Osipenko Aug. 11, 2019, 9:22 p.m. UTC
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>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/devfreq/tegra30-devfreq.c | 47 ++++++++++++++++---------------
 1 file changed, 24 insertions(+), 23 deletions(-)

Comments

Chanwoo Choi Aug. 20, 2019, 12:02 a.m. UTC | #1
Hi,

On 19. 8. 12. 오전 6:22, Dmitry Osipenko wrote:
> 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>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 47 ++++++++++++++++---------------
>  1 file changed, 24 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index a27300f40b0b..8be6a33beb9c 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -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 device with the governor early as 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);
>  
> 

Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>

Patch
diff mbox series

diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index a27300f40b0b..8be6a33beb9c 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -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 device with the governor early as 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);