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From: Tony Lindgren <tony@atomide.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops
Date: Wed, 18 Jul 2018 23:50:33 -0700	[thread overview]
Message-ID: <20180719065033.GK99251@atomide.com> (raw)
In-Reply-To: <9bc02408588716c4ddb5a2ffb7d915019433fedc.camel@linux.intel.com>

* Andy Shevchenko <andriy.shevchenko@linux.intel.com> [180718 14:54]:
> On Wed, 2018-05-23 at 11:00 -0700, Tony Lindgren wrote:
> > I thought you said earlier the issue was that you wanted to keep
> > the console enabled all the time and never idle?
> 
> Yes, for kernel console.
> To be clear, if user supplies "console=ttySx" it keeps powered on
> always. But if there is no such parameter, we are fine with RPM.

I'm fine with that as long as we have a way to detach or disable
kernel console from userspace after booting so the console uart can
idle.

> Letting kernel console do power management on the systems without
> irq_safe hack is dangerous in terms of loosing important data (crash, or
> some other stuff which needs atomic context: kgdb?).

Yes in the long run we should get rid of all pm_runtime_irq_safe()
use. It increases the parent dev PM runtime usage count permanently
blocking the whole domain from idling.

Regards,

Tony

      reply	other threads:[~2018-07-19  6:50 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-15 18:34 Andy Shevchenko
2018-05-15 18:34 ` [PATCH v1 1/3] console: introduce ->exit() callback Andy Shevchenko
2018-05-15 18:34 ` [PATCH v1 2/3] serial: 8250_port: Don't use power management for kernel console Andy Shevchenko
2018-05-15 18:34 ` [PATCH v1 3/3] serial: 8250_port: Disable DMA operations " Andy Shevchenko
2018-05-16 10:55   ` Sebastian Andrzej Siewior
2018-05-16 12:58     ` Andy Shevchenko
2018-05-16 18:20       ` Sebastian Andrzej Siewior
2018-05-15 18:37 ` [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops Andy Shevchenko
2018-05-16 10:08   ` Sebastian Andrzej Siewior
2018-05-16 10:17     ` Andy Shevchenko
2018-05-16 10:47       ` Sebastian Andrzej Siewior
2018-05-16 13:10         ` Andy Shevchenko
2018-05-17 13:56           ` Tony Lindgren
2018-05-17 16:38             ` Andy Shevchenko
2018-05-17 19:30               ` Tony Lindgren
2018-05-22 21:39                 ` Andy Shevchenko
2018-05-23 17:58                   ` Tony Lindgren
2018-05-23 18:32                     ` Tony Lindgren
2018-07-18 15:14                     ` Andy Shevchenko
2018-07-19  6:47                       ` Tony Lindgren
2018-05-17 17:04             ` Tony Lindgren
2018-05-17 13:48         ` Tony Lindgren
2018-05-17 16:36           ` Andy Shevchenko
2018-05-17 19:48             ` Tony Lindgren
2018-05-22 21:52               ` Andy Shevchenko
2018-05-23 18:00                 ` Tony Lindgren
2018-07-18 14:50                   ` Andy Shevchenko
2018-07-19  6:50                     ` Tony Lindgren [this message]

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