[PATCH 3/3] ibchip/ns16550: Minor optimisation.

[Joel Sherrill]

These look good and almost all cosmetic. Apply.

On Wed, Apr 20, 2016 at 2:20 AM, Chris Johns <chrisj at rtems.org> wrote:

> ---
>  c/src/libchip/serial/ns16550.c | 27 ++++++++++++++-------------
>  1 file changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/c/src/libchip/serial/ns16550.c
> b/c/src/libchip/serial/ns16550.c
> index 12d220c..6473028 100644
> --- a/c/src/libchip/serial/ns16550.c
> +++ b/c/src/libchip/serial/ns16550.c
> @@ -1,6 +1,6 @@
>  /**
>   *  @file
> - *
> + *
>   *  This file contains the TTY driver for the National Semiconductor
> NS16550.
>   *
>   *  This part is widely cloned and second sourced.  It is found in a
> number
> @@ -234,7 +234,7 @@ void ns16550_init(int minor)
>    Console_Port_Data[minor].pDeviceContext=(void *)pns16550Context;
>    pns16550Context->ucModemCtrl=SP_MODEM_IRQ;
>
> -  pNS16550 = c->ulCtrlPort1;
> +  pNS16550 = c->ulCtrlPort1;
>    setReg   = c->setRegister;
>    getReg   = c->getRegister;
>
> @@ -389,7 +389,7 @@ void ns16550_outch_polled(console_tbl *c, char out)
>  void ns16550_write_polled(int minor, char out)
>  {
>    console_tbl *c = Console_Port_Tbl [minor];
> -
> +
>    ns16550_outch_polled( c, out );
>  }
>
> @@ -616,27 +616,28 @@ NS16550_STATIC void ns16550_process( int minor)
>    NS16550Context *ctx = d->pDeviceContext;
>    uint32_t port = c->ulCtrlPort1;
>    getRegister_f get = c->getRegister;
> -  int i = 0;
> +  int i;
>    char buf [SP_FIFO_SIZE];
>
>    /* Iterate until no more interrupts are pending */
>    do {
>      /* Fetch received characters */
> -    for (i = 0; i < SP_FIFO_SIZE; ++i) {
> -      if ((get( port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
> -        buf [i] = (char) get(port, NS16550_RECEIVE_BUFFER);
> -      } else {
> -        break;
> +    i = 0;
> +    while ((get(port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
> +      buf[i++] = (char) get(port, NS16550_RECEIVE_BUFFER);
> +      if (i == SP_FIFO_SIZE) {
> +        /* Enqueue fetched characters */
> +        rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
> +        i = 0;
>        }
>      }
>
> -    /* Enqueue fetched characters */
> -    rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
> +    if (i > 0)
> +      rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
>
>      /* Check if we can dequeue transmitted characters */
>      if (ctx->transmitFifoChars > 0
>          && (get( port, NS16550_LINE_STATUS) & SP_LSR_THOLD) != 0) {
> -
>        /* Dequeue transmitted characters */
>        rtems_termios_dequeue_characters(
>          d->termios_data,
> @@ -869,6 +870,6 @@ int ns16550_inch_polled(
>  int ns16550_inbyte_nonblocking_polled(int minor)
>  {
>    console_tbl *c = Console_Port_Tbl [minor];
> -
> +
>    return ns16550_inch_polled( c );
>  }
> --
> 2.4.6
>
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