[PATCH] tty: omap-serial: Keep the wakeup mechanism enabled by default

[Kevin Hilman]

"Raja, Govindraj" <govindraj.raja at ti.com> writes:

> On Wed, Apr 18, 2012 at 4:55 AM, Kevin Hilman <khilman at ti.com> wrote:
>> "Govindraj.R" <govindraj.raja at ti.com> writes:
>>
>>> From: "Govindraj.R" <govindraj.raja at ti.com>
>>>
>>> The wakeups can be left enabled by default and should be disabled
>>> only when disabled from sysfs and while entering suspend.
>>
>> Left enabled?  That assumes something else has initizlied them, but we
>> can't make that assumption.
>>
>> First, wakeups should be disabled when ->probe has finished.  Then,
>> they should be enabled whenever driver is in use, and disabled when
>> the driver is not in use.
>>
>> I'm not familiar enough with uart_ops, but it looks like they should
>> probably be enabled in uart_ops->startup and disabled in
>> uart_ops->shutdown.
>
> uart_ops->shutdown gets called in suspend path also
> serial_omap_suspend => uart_suspend_port = > ops->shutdown(uport);
>
> This will leave uart wakeup disabled in suspend path.

As I said, I'm not familiar enough with uart_ops to know which are the
right ones.

Maybe ->request_port and ->release_port are the right ones?

The point is that wakeups should be enabled whenever driver is in use,
and disabled when the driver is not in use.

Kevin