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    SubjectRe: How to avoid serial port buffer overruns?
    On Thu, Aug 17, 2006 at 10:20:46AM +0100, Alan Cox wrote:
    > Ar Iau, 2006-08-17 am 00:10 +0100, ysgrifennodd Russell King:
    > > MIDI uses its own driver - sound/drivers/serial-u16550.c. My guess
    >
    > How peculiar
    >
    > > is there's something in the system starving interrupt servicing.
    > > Serial is very sensitive to that, and increases in other system
    > > latencies tends to have an adverse impact on serial.
    >
    > I see no support for the 16650 specific bits in the driver, so that
    > alone may be a problem ?

    Huh? 16550 not 16650. Did you miss this?

    outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
    | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
    | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
    | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
    /* NOTE: interrupt generated after T=(time)4-bytes
    * if less than UART_FCR_TRIGGER bytes received
    */
    ,uart->base + UART_FCR); /* FIFO Control Register */

    --
    Russell King
    Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
    maintainer of: 2.6 Serial core
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