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References: <20240110102102.61587-1-tudor.ambarus@linaro.org> <20240110102102.61587-14-tudor.ambarus@linaro.org>
In-Reply-To: <20240110102102.61587-14-tudor.ambarus@linaro.org>
From: Sam Protsenko <semen.protsenko@linaro.org>
Date: Tue, 16 Jan 2024 12:52:02 -0600
Message-ID: <CAPLW+4nH0o4fsKTBwO6XwynK2DYCiMLMkmK7LgYepHc87jHJ5g@mail.gmail.com>
Subject: Re: [PATCH 13/18] tty: serial: samsung: return bool for s3c24xx_serial_txempty_nofifo()
To: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, 
	gregkh@linuxfoundation.org, jirislaby@kernel.org, 
	linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, 
	linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, 
	andre.draszik@linaro.org, peter.griffin@linaro.org, kernel-team@android.com, 
	willmcvicker@google.com
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On Wed, Jan 10, 2024 at 4:24=E2=80=AFAM Tudor Ambarus <tudor.ambarus@linaro=
org> wrote:
>
> s3c24xx_serial_txempty_nofifo() returned either 0 or BIT(2), which is
> counterintuitive. Make the method return bool, and return true when TX
> is empty and false otherwise.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> ---
>  drivers/tty/serial/samsung_tty.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsun=
g_tty.c
> index 46fba70f3d77..63e993bed296 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -236,9 +236,9 @@ static inline const char *s3c24xx_serial_portname(con=
st struct uart_port *port)
>         return to_platform_device(port->dev)->name;
>  }
>
> -static int s3c24xx_serial_txempty_nofifo(const struct uart_port *port)
> +static bool s3c24xx_serial_txempty_nofifo(const struct uart_port *port)
>  {
> -       return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
> +       return !!(rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);

If the function already returns bool, I'm not sure doing !! is
necessary. But I don't mind.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

>  }
>
>  static void s3c24xx_serial_rx_enable(struct uart_port *port)
> @@ -782,7 +782,7 @@ static void s3c24xx_serial_rx_drain_fifo(struct s3c24=
xx_uart_port *ourport)
>                 ch =3D rd_reg(port, S3C2410_URXH);
>
>                 if (port->flags & UPF_CONS_FLOW) {
> -                       int txe =3D s3c24xx_serial_txempty_nofifo(port);
> +                       bool txe =3D s3c24xx_serial_txempty_nofifo(port);
>
>                         if (ourport->rx_enabled) {
>                                 if (!txe) {
> --
> 2.43.0.472.g3155946c3a-goog
>
>