linux-kernel - Re: [PATCH] Revert "serial: fsl_lpuart: Reset prior to registration"

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Date:   Tue, 6 Dec 2022 15:51:16 +0100
From:   Francesco Dolcini <francesco@...cini.it>
To:     Sherry Sun <sherry.sun@....com>, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, ilpo.jarvinen@...ux.intel.com
Cc:     lukas@...ner.de, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        Fabio Estevam <festevam@...il.com>,
        max.krummenacher@...adex.com
Subject: Re: [PATCH] Revert "serial: fsl_lpuart: Reset prior to registration"

Hello all,

On Thu, Sep 29, 2022 at 04:53:18PM +0800, Sherry Sun wrote:
> This reverts commit 60f361722ad2ae5ee667d0b0545d40c42f754daf.
> 
> commit 60f361722ad2 ("serial: fsl_lpuart: Reset prior to registration")
> causes the lpuart console cannot work any more. Since the console is
> registered in the uart_add_one_port(), the driver cannot identify the
> console port before call uart_add_one_port(), which causes all the uart
> ports including the console port will be global reset.
> So need to revert this patch to avoid breaking the lpuart console.
> 
> Signed-off-by: Sherry Sun <sherry.sun@....com>

What's the status/plan on this?

>From what I can tell the commit this patch is reverting introduced a
regression (that was backported to stable kernel), it should have a
Fixes tag and probably a cc:stable.

See also https://github.com/Freescale/linux-fslc/commit/a682d463667a418d3f7277dbbe06cd6347e76761

Francesco