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SubjectRe: [PATCH 4/5] iio: adc: ti_am335x_adc: Disable ADC during suspend unconditionally
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On Saturday 30 June 2018 08:48 PM, Jonathan Cameron wrote:
> On Sat, 30 Jun 2018 16:03:17 +0530
> Vignesh R <vigneshr@ti.com> wrote:
>
>> Parent MFD device takes care of enabling ADC interface whenever
>> touchscreen is marked wakeup capable. Therefore, unconditionally disable
>> ADC interface during system suspend to save power in case of system with
>> just ADC and no TSC.
>>
>> Signed-off-by: Vignesh R <vigneshr@ti.com>
>
> This sounds like a sensible change to me. Is it applicable without the
> rest of the series? If so I'll take it through IIO. If the answer
> is that it needs to go with the rest then
>

This patch as such does not have any compile time dependencies on other
patches, but I would like Dmitry's opinion on the series before being
merged.

> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>

Thanks!


Regards
Vignesh

> Thanks,
>
> Jonathan
>> ---
>> drivers/iio/adc/ti_am335x_adc.c | 12 ++++--------
>> 1 file changed, 4 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
>> index 80df5a377d30..cafb1dcadc48 100644
>> --- a/drivers/iio/adc/ti_am335x_adc.c
>> +++ b/drivers/iio/adc/ti_am335x_adc.c
>> @@ -693,16 +693,12 @@ static int __maybe_unused tiadc_suspend(struct device *dev)
>> {
>> struct iio_dev *indio_dev = dev_get_drvdata(dev);
>> struct tiadc_device *adc_dev = iio_priv(indio_dev);
>> - struct ti_tscadc_dev *tscadc_dev;
>> unsigned int idle;
>>
>> - tscadc_dev = ti_tscadc_dev_get(to_platform_device(dev));
>> - if (!device_may_wakeup(tscadc_dev->dev)) {
>> - idle = tiadc_readl(adc_dev, REG_CTRL);
>> - idle &= ~(CNTRLREG_TSCSSENB);
>> - tiadc_writel(adc_dev, REG_CTRL, (idle |
>> - CNTRLREG_POWERDOWN));
>> - }
>> + idle = tiadc_readl(adc_dev, REG_CTRL);
>> + idle &= ~(CNTRLREG_TSCSSENB);
>> + tiadc_writel(adc_dev, REG_CTRL, (idle |
>> + CNTRLREG_POWERDOWN));
>>
>> return 0;
>> }
>

--
Regards
Vignesh

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