linux-kernel - Re: [PATCH V3 5/6] tty: serial: meson: meson_uart_shutdown omit clear AML_UART_TX

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Date:   Fri, 31 Dec 2021 18:42:34 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Vyacheslav <adeep@...ina.in>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH V3 5/6] tty: serial: meson: meson_uart_shutdown omit clear
 AML_UART_TX_EN bit



On 2021/12/31 6:44, Martin Blumenstingl wrote:
> [ EXTERNAL EMAIL ]
> 
> On Thu, Dec 30, 2021 at 11:22 AM Yu Tu <yu.tu@...ogic.com> wrote:
> [...]
>>          val = readl(port->membase + AML_UART_CONTROL);
>> -       val &= ~AML_UART_RX_EN;
>> +       val &= ~(AML_UART_RX_EN | AML_UART_TX_EN);
>>          val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
>>          writel(val, port->membase + AML_UART_CONTROL);
> This looks fine to me but I think it would be good to Cc the author of
> commit 855ddcab352c15 ("ARM: meson: serial: only disable tx irq on
> stop")
> The meson_uart driver which Carlo added eight years ago did clear
> AML_UART_TX_EN here, but it was changed with the commit I mentioned
> above.
> 
I'm going to delete this change this time. Because there is no bug at 
present, if this is a bug encountered later, i will prepare to submit 
this change.
> 
> Best regards,
> Martin
>