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

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Message-ID: <87a5xii33r.fsf@jogness.linutronix.de>
Date:   Fri, 02 Jun 2023 12:19:28 +0206
From:   John Ogness <john.ogness@...utronix.de>
To:     Chen-Yu Tsai <wenst@...omium.org>, Tony Lindgren <tony@...mide.com>
Cc:     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>,
        Johan Hovold <johan@...nel.org>,
        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,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v12 1/1] serial: core: Start managing serial controllers
 to enable runtime PM

On 2023-06-02, Chen-Yu Tsai <wenst@...omium.org> wrote:
> This patch, in linux-next since 20230601, unfortunately breaks
> MediaTek based Chromebooks. The kernel hangs during the probe of the
> serial ports, which use the 8250_mtk driver.

Are you sure it is this patch? Have you bisected it?

Unfortunately next-20230601 also brought in a series that added
spinlocking to the 8250 driver. That may be the issue here instead.

For 8250 bug reports we really need to bisection.

John Ogness