linux-kernel - Re: [PATCH 3/5] serial: fsl_lpuart: Remove custom frame size calculation

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Date:   Fri, 26 Aug 2022 18:56:27 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] serial: fsl_lpuart: Remove custom frame size calculation

On Thu, Aug 25, 2022 at 11:59 AM Ilpo Järvinen
<ilpo.jarvinen@...ux.intel.com> wrote:
>
> The number of bits can be calculated using tty_get_frame_size(), no
> need for the driver to do it on its own.

...

>         struct dma_slave_config dma_rx_sconfig = {};
>         struct circ_buf *ring = &sport->rx_ring;
>         int ret, nent;
> -       int bits, baud;
> +       int baud;
>         struct tty_port *port = &sport->port.state->port;
>         struct tty_struct *tty = port->tty;
>         struct ktermios *termios = &tty->termios;
>         struct dma_chan *chan = sport->dma_rx_chan;
>
>         baud = tty_get_baud_rate(tty);

You can move baud and join with the assignment, right?
At the same time provide a temporary variable for bits here with the assignment.

> -       bits = (termios->c_cflag & CSIZE) == CS7 ? 9 : 10;
> -       if (termios->c_cflag & PARENB)
> -               bits++;
> -
>         /*
>          * Calculate length of one DMA buffer size to keep latency below
>          * 10ms at any baud rate.
>          */
> -       sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud /  bits / 1000) * 2;

This will be left untouched.

> +       sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / tty_get_frame_size(termios->c_cflag) /
> +                                    1000) * 2;

And no strange indentation.

-- 
With Best Regards,
Andy Shevchenko