linux-kernel - Re: [PATCH 2/3] tty: serial: meson: meson_uart_shutdown omit clear AML_UART_TX

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Date:   Wed, 22 Dec 2021 17:01:00 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH 2/3] tty: serial: meson: meson_uart_shutdown omit clear
 AML_UART_TX_EN bit



On 2021/12/21 15:32, Greg Kroah-Hartman wrote:
> [ EXTERNAL EMAIL ]
> 
> On Tue, Dec 21, 2021 at 03:16:33PM +0800, Yu Tu wrote:
>> The meson_uart_shutdown function should have the opposite operation to
>> the meson_uart_startup function, so the shutdown of AML_UART_TX_EN is
>> logically missing.
>>
>> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
> 
> What commit does this fix?  Should it go to stable kernels?  Please put
> that in here if needed.
> 
It has not yet been revealed that this is a bug. The reason I changed it 
was because I thought it was an improvement and it might be a hidden 
bug.The AML_UART_TX_EN bit is conspicuously missing when comparing the 
meson_uart_shutdown and meson_uart_startup functions.So I think it's 
best to add.
> thanks,
> 
> greg k-h
>