[PATCH 0/6] tty: serial: propagate errors from uart_ops.pm callback

[Tony Lindgren]

* Andy Shevchenko <andriy.shevchenko at linux.intel.com> [260709 10:38]:
> Just no, please just properly implement runtime PM. The .pm() must die completely.
> I used to have the PoC for that long time ago [1], but due to lack of time and
> other priorities it went abandoned. Also Atlassian made a brain damages move to
> limit repository to 1Gb, so I haven't able to update it for a few years.
> 
> Note, that Tony (you have him in the Cc list) did a lot for some corner cases
> with that and we still have them IIRC. Tony, do you know what is the state of
> affairs with runtime PM for UART?

The RX side of things should work for hardware that can wake up to an incoming
event. Linux for sure needs more work to properly handle the various corner case
TX wake-up of a PM runtime idled UART. I'm mostly offline until Monday though,
will check my notes for more details next week.

Regards,

Tony

> [1]: https://bitbucket.org/andy-shev/linux/branch/topic/uart/rpm-plus