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

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Date:   Mon, 10 Jan 2022 16:55:14 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.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] tty: serial: meson: meson_uart_shutdown omit clear
 AML_UART_TX_EN bit

Hi All,
	I'm really sorry for sending the wrong specified file. Please ignore 
the email. I will resend V4.

On 2022/1/10 16:26, Yu Tu wrote:
> This change is an improvement. The meson_uart_shutdown function
> should have the opposite operation to the meson_uart_startup
> function, but the meson_uart_shutdown of AML_UART_TX_EN is logically
> missing.
> 
> Signed-off-by: Yu Tu <yu.tu@...ogic.com>
> ---
>   drivers/tty/serial/meson_uart.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 9b07e3534969..c17109d6d441 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -140,7 +140,7 @@ static void meson_uart_shutdown(struct uart_port *port)
>   	spin_lock_irqsave(&port->lock, flags);
>   
>   	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);
>   
> 
> base-commit: b3a9e3b9622ae10064826dccb4f7a52bd88c7407
> prerequisite-patch-id: 97a514f3447511cb204179ce03ae99dc1d5902d9
> prerequisite-patch-id: a2e4756ff85f0df0efe111d7e2cb51b8e26e226f
> prerequisite-patch-id: af9e3acc8f6ff7602d3a68a57c008e5ec362b353
> prerequisite-patch-id: a44e5da7009d9b815eb87395cbd7d14e7d953a09