On Thu, May 17, 2018 at 4:56 PM, Tony Lindgren <tony@xxxxxxxxxxx> wrote: > * Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> [180516 13:12]: >> On Wed, 2018-05-16 at 12:47 +0200, Sebastian Andrzej Siewior wrote: >> > But since I am on it. You have to enable runtime-PM for the UART. So >> > what is the problem if you simply don't enable it for the UART which >> > used as the kernel console? >> >> How do I know at the ->probe() time that device in question is going to >> be kernel console? Maybe I missed simple way of it. > > Hmm parse the kernel cmdline maybe? :) > > BTW, kernel already has earlycon doing exactly what you're trying to do. I'm sorry, I didn't follow. What exactly earlycon does? The problem is in 8250 driver. The issue with runtime PM used in atomic context. So, I can, of course just remove callbacks from the console ->write(). Though it will prevent to use kernel console anyway. -- With Best Regards, Andy Shevchenko -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
