[PATCH] gpio-lynxpoint: enable input sensing in resume

[PATCH] gpio-lynxpoint: enable input sensing in resume

[Mathias Nyman]

It appears that input sensing bit might be reset during
suspend/resume. Set input sensing again for all requested gpios
in resume

Tested-by: Jerome Blin <jerome.blin@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/gpio/gpio-lynxpoint.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/gpio/gpio-lynxpoint.c b/drivers/gpio/gpio-lynxpoint.c
index ff9eb91..4165672 100644
--- a/drivers/gpio/gpio-lynxpoint.c
+++ b/drivers/gpio/gpio-lynxpoint.c
@@ -407,9 +407,33 @@ static int lp_gpio_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static int lp_gpio_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int lp_gpio_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct lp_gpio *lg = platform_get_drvdata(pdev);
+	unsigned long reg;
+	int i;
+
+	/* on some hardware suspend clears input sensing, re-enable it here */
+	for (i = 0; i < lg->chip.ngpio; i++) {
+		if (gpiochip_is_requested(&lg->chip, i) != NULL) {
+			reg = lp_gpio_reg(&lg->chip, i, LP_CONFIG2);
+			outl(inl(reg) & ~GPINDIS_BIT, reg);
+		}
+	}
+	return 0;
+}
+
 static const struct dev_pm_ops lp_gpio_pm_ops = {
 	.runtime_suspend = lp_gpio_runtime_suspend,
 	.runtime_resume = lp_gpio_runtime_resume,
+	.suspend = lp_gpio_suspend,
+	.resume = lp_gpio_resume,
 };
 
 static const struct acpi_device_id lynxpoint_gpio_acpi_match[] = {
-- 
1.8.3.2

Re: [PATCH] gpio-lynxpoint: enable input sensing in resume

[Mika Westerberg]

On Tue, Aug 19, 2014 at 01:30:28PM +0300, Mathias Nyman wrote:
> It appears that input sensing bit might be reset during
> suspend/resume. Set input sensing again for all requested gpios
> in resume
> 
> Tested-by: Jerome Blin <jerome.blin@intel.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
> ---
>  drivers/gpio/gpio-lynxpoint.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/gpio/gpio-lynxpoint.c b/drivers/gpio/gpio-lynxpoint.c
> index ff9eb91..4165672 100644
> --- a/drivers/gpio/gpio-lynxpoint.c
> +++ b/drivers/gpio/gpio-lynxpoint.c
> @@ -407,9 +407,33 @@ static int lp_gpio_runtime_resume(struct device *dev)
>  	return 0;
>  }
>  
> +static int lp_gpio_suspend(struct device *dev)
> +{
> +	return 0;
> +}

If this function doesn't do anything why it needs to be defined here?

> +
> +static int lp_gpio_resume(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct lp_gpio *lg = platform_get_drvdata(pdev);
> +	unsigned long reg;
> +	int i;
> +
> +	/* on some hardware suspend clears input sensing, re-enable it here */
> +	for (i = 0; i < lg->chip.ngpio; i++) {
> +		if (gpiochip_is_requested(&lg->chip, i) != NULL) {
> +			reg = lp_gpio_reg(&lg->chip, i, LP_CONFIG2);
> +			outl(inl(reg) & ~GPINDIS_BIT, reg);
> +		}
> +	}
> +	return 0;
> +}
> +
>  static const struct dev_pm_ops lp_gpio_pm_ops = {
>  	.runtime_suspend = lp_gpio_runtime_suspend,
>  	.runtime_resume = lp_gpio_runtime_resume,
> +	.suspend = lp_gpio_suspend,
> +	.resume = lp_gpio_resume,
>  };
>  
>  static const struct acpi_device_id lynxpoint_gpio_acpi_match[] = {
> -- 
> 1.8.3.2

Re: [PATCH] gpio-lynxpoint: enable input sensing in resume

[Mathias Nyman]

On 08/19/2014 01:22 PM, Mika Westerberg wrote:
> On Tue, Aug 19, 2014 at 01:30:28PM +0300, Mathias Nyman wrote:
>> It appears that input sensing bit might be reset during
>> suspend/resume. Set input sensing again for all requested gpios
>> in resume
>>
>> Tested-by: Jerome Blin <jerome.blin@intel.com>
>> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
>> ---
>>  drivers/gpio/gpio-lynxpoint.c | 24 ++++++++++++++++++++++++
>>  1 file changed, 24 insertions(+)
>>
>> diff --git a/drivers/gpio/gpio-lynxpoint.c b/drivers/gpio/gpio-lynxpoint.c
>> index ff9eb91..4165672 100644
>> --- a/drivers/gpio/gpio-lynxpoint.c
>> +++ b/drivers/gpio/gpio-lynxpoint.c
>> @@ -407,9 +407,33 @@ static int lp_gpio_runtime_resume(struct device *dev)
>>  	return 0;
>>  }
>>  
>> +static int lp_gpio_suspend(struct device *dev)
>> +{
>> +	return 0;
>> +}
> 
> If this function doesn't do anything why it needs to be defined here?
> 

I guess it doesn't, Added the suspend and resume functions as a pair, but only
resume turned out to do something,

I'll remove it.

-Mathias