On Wed, 2016-08-24 at 17:03 +0200, bigeasy@xxxxxxxxxxxxx wrote:
> On 2016-08-24 14:56:12 [+0000], Shevchenko, Andriy wrote:
> > Today I discovered that runtime PM rather broken in 8250 _by
> > design_.
> > It
> > definitely requires irq_safe flag to be set in runtime PM. But that
> > flag
> > demolishes an effort since it keeps parent (and thus all other
> > devices
> > which parent needs to be on) always on.
^^^^^ (1)
> >
> > The question is is somebody is going to fix this and when?
>
> Why is it broken?
I meant that without irq_safe flag set there are too many places where
"sleep while in atomic" happens. On the other hand the irq_safe flag
prevents parent to go to suspend.
> As far as I remember the UART (on TI's beagle) can be
> shutdown. The result is that the first RX byte will wake up the board
> and loosing the first few bytes (depending the baud rate) until the
> clock is stable again. This was tested while I moved the PM bits from
> omap-serial to the 8250 version.
>
> Sebastian
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
Intel Finland Oy
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