On Tue, 20 Sep 2022, Jiri Slaby wrote:
> The condition in lqasc_tx_chars()'s loop is barely readable. Extract it
> to a separate function. This will make the cleanup in the next patches
> easier too.
>
> (Put it before lqasc_start_tx(), so that we can use it there later.)
>
> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
> ---
>
> Notes:
> [v4] this is new in v4 -- extracted as a separate change
>
> drivers/tty/serial/lantiq.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
> index 6637b3caa6b7..6da1b7496c6c 100644
> --- a/drivers/tty/serial/lantiq.c
> +++ b/drivers/tty/serial/lantiq.c
> @@ -139,6 +139,13 @@ lqasc_stop_tx(struct uart_port *port)
> return;
> }
>
> +static bool lqasc_tx_ready(struct uart_port *port)
> +{
> + u32 fstat = __raw_readl(port->membase + LTQ_ASC_FSTAT);
> +
> + return (fstat & ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
FIELD_GET(ASCFSTAT_TXFREEMASK, fstat)
> +}
> +
> static void
> lqasc_start_tx(struct uart_port *port)
> {
> @@ -228,8 +235,7 @@ lqasc_tx_chars(struct uart_port *port)
> return;
> }
>
> - while (((__raw_readl(port->membase + LTQ_ASC_FSTAT) &
> - ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
> + while (lqasc_tx_ready(port)) {
> if (port->x_char) {
> writeb(port->x_char, port->membase + LTQ_ASC_TBUF);
> port->icount.tx++;
There's similar construct in lqasc_console_putchar() that could take
advantage of the same helper.
With FIELD_GET + the other place using the new helper, ASCFSTAT_TXFREEOFF
can be dropped as well.
--
i.
