[PATCH v3] iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set

[PATCH v3] iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set

[Maxim Kochetkov]

To stop conversion ads1015_set_power_state() function call unimplemented
function __pm_runtime_suspend() from pm_runtime_put_autosuspend()
if CONFIG_PM is not set.
In case of CONFIG_PM is not set: __pm_runtime_suspend() returns -ENOSYS,
so ads1015_read_raw() failed because ads1015_set_power_state() returns an
error.

If CONFIG_PM is disabled, there is no need to start/stop conversion.
Fix it by adding return 0 function variant if CONFIG_PM is not set.

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Tested-by: Maxim Kiselev <bigunclemax@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/iio/adc/ti-ads1015.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index 5ea4f45d6bad..64fe3b2a6ec6 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -316,6 +316,7 @@ static const struct iio_chan_spec ads1115_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
 };
 
+#ifdef CONFIG_PM
 static int ads1015_set_power_state(struct ads1015_data *data, bool on)
 {
 	int ret;
@@ -333,6 +334,15 @@ static int ads1015_set_power_state(struct ads1015_data *data, bool on)
 	return ret < 0 ? ret : 0;
 }
 
+#else /* !CONFIG_PM */
+
+static int ads1015_set_power_state(struct ads1015_data *data, bool on)
+{
+	return 0;
+}
+
+#endif /* !CONFIG_PM */
+
 static
 int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
 {
-- 
2.27.0

Re: [PATCH v3] iio: adc: ti-ads1015: fix conversion when CONFIG_PM is not set

[Jonathan Cameron]

On Wed, 29 Jul 2020 13:35:23 +0300
Maxim Kochetkov <fido_max@inbox.ru> wrote:

> To stop conversion ads1015_set_power_state() function call unimplemented
> function __pm_runtime_suspend() from pm_runtime_put_autosuspend()
> if CONFIG_PM is not set.
> In case of CONFIG_PM is not set: __pm_runtime_suspend() returns -ENOSYS,
> so ads1015_read_raw() failed because ads1015_set_power_state() returns an
> error.
> 
> If CONFIG_PM is disabled, there is no need to start/stop conversion.
> Fix it by adding return 0 function variant if CONFIG_PM is not set.
> 
> Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
> Tested-by: Maxim Kiselev <bigunclemax@gmail.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Patch looks good, but can I have a Fixes tag for it?

Thanks,

Jonathan


> ---
>  drivers/iio/adc/ti-ads1015.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index 5ea4f45d6bad..64fe3b2a6ec6 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -316,6 +316,7 @@ static const struct iio_chan_spec ads1115_channels[] = {
>  	IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
>  };
>  
> +#ifdef CONFIG_PM
>  static int ads1015_set_power_state(struct ads1015_data *data, bool on)
>  {
>  	int ret;
> @@ -333,6 +334,15 @@ static int ads1015_set_power_state(struct ads1015_data *data, bool on)
>  	return ret < 0 ? ret : 0;
>  }
>  
> +#else /* !CONFIG_PM */
> +
> +static int ads1015_set_power_state(struct ads1015_data *data, bool on)
> +{
> +	return 0;
> +}
> +
> +#endif /* !CONFIG_PM */
> +
>  static
>  int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
>  {