Hi,
On Monday 16 April 2018 11:15 PM, Dmitry Torokhov wrote:
> On Sat, Apr 14, 2018 at 03:21:51PM +0530, Vignesh R wrote:
>> On AM335x, ti_am335x_tsc can wake up the system from suspend, mark the
>> IRQ as wakeup capable, so that device irq is not disabled during system
>> suspend.
>>
>> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
>> ---
>>
>> v2: No changes
>>
>> drivers/input/touchscreen/ti_am335x_tsc.c | 9 +++++++++
>> 1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
>> index f1043ae71dcc..810e05c9c4f5 100644
>> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
>> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
>> @@ -27,6 +27,7 @@
>> #include <linux/of.h>
>> #include <linux/of_device.h>
>> #include <linux/sort.h>
>> +#include <linux/pm_wakeirq.h>
>>
>> #include <linux/mfd/ti_am335x_tscadc.h>
>>
>> @@ -432,6 +433,12 @@ static int titsc_probe(struct platform_device *pdev)
>> goto err_free_mem;
>> }
>>
>> + if (device_may_wakeup(tscadc_dev->dev)) {
>> + err = dev_pm_set_wake_irq(tscadc_dev->dev, ts_dev->irq);
>
> Hmm, most of the drivers simply use enable_irq_wake()/disable_irq_wake()
> in suspend/resume paths
dev_pm_*_wake_irq() function are alternative to above
[1]:
For most drivers, we should be able to drop the following
boilerplate code from runtime_suspend and runtime_resume
functions:
...
device_init_wakeup(dev, true);
...
if (device_may_wakeup(dev))
enable_irq_wake(irq);
...
if (device_may_wakeup(dev))
disable_irq_wake(irq);
...
device_init_wakeup(dev, false);
...
We can replace it with just the following init and exit
time code:
...
device_init_wakeup(dev, true);
dev_pm_set_wake_irq(dev, irq);
...
dev_pm_clear_wake_irq(dev);
device_init_wakeup(dev, false);
[1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/base/power/wakeirq.c?id=4990d4fe327b9d9a7a3be7103a82699406fdde69
I see device_may_wakeup() check is not required. Will drop that in next version.
> and use dev_pm_set_wake_irq() only for dedicated
> and distinct wake interrupts. Why do we not follow the same pattern
> here?
Thats dev_pm_*_dedicated_wake_irq()
Thanks for the review!
--
Regards
Vignesh
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