Re: [PATCH] hwmon: (pwm-fan) Fix suspend/resume behavior
On Mon, Nov 03, 2014 at 03:42:55PM +0100, Kamil Debski wrote: > The state of a PWM output is not clearly defined after resume. Some PWM > drivers do not restore the duty cycle upon resume, thus it is necessary to > manually restore the correct value. > > Signed-off-by: Kamil Debski Applied. Thanks, Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH] hwmon: (pwm-fan) Fix suspend/resume behavior
The state of a PWM output is not clearly defined after resume. Some PWM
drivers do not restore the duty cycle upon resume, thus it is necessary to
manually restore the correct value.
Signed-off-by: Kamil Debski
---
drivers/hwmon/pwm-fan.c | 13 ++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 823c877..1991d903 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -161,10 +161,17 @@ static int pwm_fan_suspend(struct device *dev)
static int pwm_fan_resume(struct device *dev)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned long duty;
+ int ret;
- if (ctx->pwm_value)
- return pwm_enable(ctx->pwm);
- return 0;
+ if (ctx->pwm_value == 0)
+ return 0;
+
+ duty = DIV_ROUND_UP(ctx->pwm_value * (ctx->pwm->period - 1), MAX_PWM);
+ ret = pwm_config(ctx->pwm, duty, ctx->pwm->period);
+ if (ret)
+ return ret;
+ return pwm_enable(ctx->pwm);
}
#endif
--
1.7.9.5
--
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[PATCH] hwmon: (pwm-fan) Fix suspend/resume behavior
The state of a PWM output is not clearly defined after resume. Some PWM
drivers do not restore the duty cycle upon resume, thus it is necessary to
manually restore the correct value.
Signed-off-by: Kamil Debski k.deb...@samsung.com
---
drivers/hwmon/pwm-fan.c | 13 ++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 823c877..1991d903 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -161,10 +161,17 @@ static int pwm_fan_suspend(struct device *dev)
static int pwm_fan_resume(struct device *dev)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned long duty;
+ int ret;
- if (ctx-pwm_value)
- return pwm_enable(ctx-pwm);
- return 0;
+ if (ctx-pwm_value == 0)
+ return 0;
+
+ duty = DIV_ROUND_UP(ctx-pwm_value * (ctx-pwm-period - 1), MAX_PWM);
+ ret = pwm_config(ctx-pwm, duty, ctx-pwm-period);
+ if (ret)
+ return ret;
+ return pwm_enable(ctx-pwm);
}
#endif
--
1.7.9.5
--
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Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH] hwmon: (pwm-fan) Fix suspend/resume behavior
On Mon, Nov 03, 2014 at 03:42:55PM +0100, Kamil Debski wrote: The state of a PWM output is not clearly defined after resume. Some PWM drivers do not restore the duty cycle upon resume, thus it is necessary to manually restore the correct value. Signed-off-by: Kamil Debski k.deb...@samsung.com Applied. Thanks, Guenter -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
