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Commit e79032aa authored by Vasily Khoruzhick's avatar Vasily Khoruzhick Committed by Ben Dooks
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ARM: SAMSUNG: Add suspend/resume support for S3C PWM driver 



Reset period_ns and duty_ns values in suspend handler to avoid skip of
configuration if same values passed to pwm_config;
Restore invertion bit in resume handler.

Without this patch PWM works incorrectly after resume from suspend.

Signed-off-by: default avatarVasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 664e87e4

arch/arm/plat-samsung/pwm.c

+35 −0
Original line number Diff line number Diff line
@@ -379,6 +379,39 @@ static int __devexit s3c_pwm_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM

static int s3c_pwm_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct pwm_device *pwm = platform_get_drvdata(pdev);



	/* No one preserve these values during suspend so reset them

	 * Otherwise driver leaves PWM unconfigured if same values

	 * passed to pwm_config

	 */

	pwm->period_ns = 0;

	pwm->duty_ns = 0;



	return 0;

}



static int s3c_pwm_resume(struct platform_device *pdev)

{

	struct pwm_device *pwm = platform_get_drvdata(pdev);

	unsigned long tcon;



	/* Restore invertion */

	tcon = __raw_readl(S3C2410_TCON);

	tcon |= pwm_tcon_invert(pwm);

	__raw_writel(tcon, S3C2410_TCON);



	return 0;

}



#else

#define s3c_pwm_suspend NULL

#define s3c_pwm_resume NULL

#endif



static struct platform_driver s3c_pwm_driver = {

	.driver		= {

		.name	= "s3c24xx-pwm",
@@ -386,6 +419,8 @@ static struct platform_driver s3c_pwm_driver = { 
	},

	.probe		= s3c_pwm_probe,

	.remove		= __devexit_p(s3c_pwm_remove),

	.suspend	= s3c_pwm_suspend,

	.resume		= s3c_pwm_resume,

};



static int __init pwm_init(void)