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

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Message-ID: <CAFBinCC7pvT4=LhowZQpH-_5=90KBnczcRfYc3tLQr8hEh49Zg@mail.gmail.com>
Date:   Thu, 30 Dec 2021 23:44:37 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Yu Tu <yu.tu@...ogic.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 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.


Best regards,
Martin