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Commit 1d6b6987 authored by Grant Likely's avatar Grant Likely Committed by Josh Boyer
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[POWERPC] Uartlite: speed up console output 



Change the wait_tx routine to call cpu_relax() instead of udelay() to
reduce console output latency and test for the TXFULL bit instead of
TXEMPTY.  That way the FIFO doesn't need to by 100% flushed before
writing the next character.

Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Acked-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
parent 7ae0fa49

drivers/serial/uartlite.c

+6 −4
Original line number Original line Diff line number Diff line
@@ -329,12 +329,14 @@ static struct uart_ops ulite_ops = { 
static void ulite_console_wait_tx(struct uart_port *port)

static void ulite_console_wait_tx(struct uart_port *port)

{

{

	int i;

	int i;

	u8 val;





	/* wait up to 10ms for the character(s) to be sent */

	/* Spin waiting for TX fifo to have space available */

	for (i = 0; i < 10000; i++) {

	for (i = 0; i < 100000; i++) {

		if (readb(port->membase + ULITE_STATUS) & ULITE_STATUS_TXEMPTY)

		val = readb(port->membase + ULITE_STATUS);

		if ((val & ULITE_STATUS_TXFULL) == 0)

			break;

			break;

		udelay(1);

		cpu_relax();

	}

	}

}

}