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SubjectRe: [PATCH v4 2/2] tty: serial: add driver for the SiFive UART
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On Apr 11 2019, Paul Walmsley <paul.walmsley@sifive.com> wrote:

> +static void sifive_serial_set_termios(struct uart_port *port,
> + struct ktermios *termios,
> + struct ktermios *old)
> +{
> + struct sifive_serial_port *ssp = port_to_sifive_serial_port(port);
> + unsigned long flags;
> + u32 v, old_v;
> + int rate;
> + char nstop;
> +
> + if ((termios->c_cflag & CSIZE) != CS8) {
> + dev_err(ssp->port.dev, "only 8-bit words supported\n");
> + return;
> + }
> +
> + /* Set number of stop bits */
> + nstop = (termios->c_cflag & CSTOPB) ? 2 : 1;
> + __ssp_set_stop_bits(ssp, nstop);
> +
> + /* Set line rate */
> + rate = uart_get_baud_rate(port, termios, old, 0, ssp->clkin_rate / 16);
> + __ssp_update_baud_rate(ssp, rate);
> +
> + spin_lock_irqsave(&ssp->port.lock, flags);
> +
> + /*
> + * Update the per-port timeout.
> + */
> + uart_update_timeout(port, termios->c_cflag, rate);
> +
> + ssp->port.read_status_mask = 0;
> + if (termios->c_iflag & INPCK) {
> + dev_err(ssp->port.dev, "INPCK flag not supported\n");
> + goto ssst_out;
> + }
> + if (termios->c_iflag & (BRKINT | PARMRK)) {
> + dev_err(ssp->port.dev, "BRKINT/PARMRK flag not supported\n");
> + goto ssst_out;
> + }

I don't think it is a good idea to print something while the port is
locked.

And I think set_termios is supposed to apply all applicable settings,
even if some of them are not supported.

Andreas.

--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

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