linux-kernel - Re: [PATCH] serial: 8250_port: Fix imprecise external abort for mctrl if inactive

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Date:   Mon, 15 Jun 2020 12:57:30 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Merlijn Wajer <merlijn@...zup.org>,
        Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH] serial: 8250_port: Fix imprecise external abort for
 mctrl if inactive

On Tue, Jun 02, 2020 at 11:55:15AM -0700, Tony Lindgren wrote:
> * Tony Lindgren <tony@...mide.com> [200602 13:38]:
> > * Andy Shevchenko <andy.shevchenko@...il.com> [200602 08:33]:
> > Now that we can detach and reattach the kernel serial console,
> > there should not be any need for pm_runtime_irq_safe() anymore :)
> 
> Below is a hastily tested RFC patch to remove pm_runtime_irq_safe()
> for 8250_omap.c that seems to work for idle use case :)
> 
> > And the UART wake-up from deeper idle states can only happen with
> > help of external hardware like GPIO controller or pinctrl controller.
> 
> It does not yet include the check for configured wakeirq though.
> And omap-serial.c needs a similar patch or maybe we can attempt
> to just drop it this time as 8250_omap.c should be used nowadays.
> Or just drop PM from omap-serial.c if it can't be dropped.
> 
> Andy, is the change below the only remaining blocker now for
> your serial PM runtime changes?

In private chat we have got more or less working solution. We both will going
to give more tests and then I will share (at least as a branch on some public
Git service) the set.

-- 
With Best Regards,
Andy Shevchenko