diff options
| author |   Vasily Khoruzhick <anarsoul@gmail.com> | 2010-03-15 16:27:08 +0200 |
|---|---|---|
| committer |   Ben Dooks <ben-linux@fluff.org> | 2010-03-15 22:43:33 +0000 |
| commit | e79032aa75af76a14e2cdd973b199855e7761881 (patch) | |
| tree | 0dfefe4a63ce0afafd782eda859be26250b93f20 /arch/arm/plat-samsung/pwm.c | |
| parent | ARM: S3C2440: Fix s3c2440 cpufreq compilation post move. (diff) | |
| download | linux-dev-e79032aa75af76a14e2cdd973b199855e7761881.tar.xz linux-dev-e79032aa75af76a14e2cdd973b199855e7761881.zip | |
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: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-samsung/pwm.c')
| -rw-r--r-- | arch/arm/plat-samsung/pwm.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/pwm.c b/arch/arm/plat-samsung/pwm.c index ef019f27b67d..f2d11390d01c 100644 --- a/arch/arm/plat-samsung/pwm.c +++ b/arch/arm/plat-samsung/pwm.c @@ -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) |