linux-kernel - Re: [PATCH v12 1/1] serial: core: Start managing serial controllers to enable runtime PM

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Date:   Wed, 4 Oct 2023 12:03:20 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Maximilian Luz <luzmaximilian@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v12 1/1] serial: core: Start managing serial controllers
 to enable runtime PM

* Johan Hovold <johan@...nel.org> [231004 07:14]:
> The pm_runtime_get_sync() in serdev_device_open() is supposed to prevent
> that from happening by default and if that now longer works, then that
> needs to be fixed.

No changes there, that all should work just as before.

What is broken is that the new serial port device can autosuspend while
the serdev device is active. This prevents serial tx in the suspend
path.

The serial port device and serdev device are siblings of the physical
serial port controller device as seen in the hierarcy printed out by
Maximilian.

Regards,

Tony