On 16 July 2015 at 02:42, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> On Wednesday, July 15, 2015 02:40:08 PM Tomeu Vizoso wrote:
>> Have dev_pm_ops.prepare return 1 for USB devices and ports so that USB
>> devices can remain runtime-suspended when the system goes to a sleep
>> state, if their wakeup state is correct and they have runtime PM enabled.
>>
>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
>> ---
>>
>> drivers/usb/core/port.c | 6 ++++++
>> drivers/usb/core/usb.c | 11 ++++++++++-
>> 2 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
>> index 210618319f10..f49707d73b5a 100644
>> --- a/drivers/usb/core/port.c
>> +++ b/drivers/usb/core/port.c
>> @@ -168,12 +168,18 @@ static int usb_port_runtime_suspend(struct device *dev)
>>
>> return retval;
>> }
>> +
>> +static int usb_port_prepare(struct device *dev)
>> +{
>> + return 1;
>> +}
>> #endif
>>
>> static const struct dev_pm_ops usb_port_pm_ops = {
>> #ifdef CONFIG_PM
>> .runtime_suspend = usb_port_runtime_suspend,
>> .runtime_resume = usb_port_runtime_resume,
>> + .prepare = usb_port_prepare,
>> #endif
>> };
>>
>> diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
>> index 8d5b2f4113cd..cf4dde11db1c 100644
>> --- a/drivers/usb/core/usb.c
>> +++ b/drivers/usb/core/usb.c
>> @@ -316,7 +316,16 @@ static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
>>
>> static int usb_dev_prepare(struct device *dev)
>> {
>> - return 0; /* Implement eventually? */
>> + struct usb_device *udev = to_usb_device(dev);
>> +
>> + if (!pm_runtime_enabled(dev))
>
> Why just enabled and not suspended?
Hmm, the core checks if it's runtime suspended before going
direct_complete, but it's true that the API docs say that it should
return a positive value only if it's runtime suspended.
Is there a reason why the prepare() implementations have to check that
instead of leaving it to the core?
Thanks,
Tomeu
>> + return 0;
>> +
>> + /* Return 0 if the current wakeup setting is wrong, otherwise 1 */
>> + if (udev->do_remote_wakeup != device_may_wakeup(dev))
>> + return 0;
>> +
>> + return 1;
>> }
>>
>> static void usb_dev_complete(struct device *dev)
>>
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
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