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Commit 63e3ad32 authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Greg Kroah-Hartman
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serial: clps711x: Give a chance to perform useful tasks during wait loop 



This patch adds cond_sched() calls during wait loop to perform
other tasks.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 015355b7

drivers/tty/serial/clps711x.c

+15 −6
Original line number Diff line number Diff line
@@ -368,11 +368,16 @@ static const struct uart_ops uart_clps711x_ops = { 
static void uart_clps711x_console_putchar(struct uart_port *port, int ch)

{

	struct clps711x_port *s = dev_get_drvdata(port->dev);



	/* Wait for FIFO is not full */

	while (1) {

		u32 sysflg = 0;



	do {

		regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);

	} while (sysflg & SYSFLG_UTXFF);

		if (!(sysflg & SYSFLG_UTXFF))

			break;

		cond_resched();

	}



	writew(ch, port->membase + UARTDR_OFFSET);

}
@@ -382,14 +387,18 @@ static void uart_clps711x_console_write(struct console *co, const char *c, 
{

	struct uart_port *port = clps711x_uart.state[co->index].uart_port;

	struct clps711x_port *s = dev_get_drvdata(port->dev);

	u32 sysflg = 0;



	uart_console_write(port, c, n, uart_clps711x_console_putchar);



	/* Wait for transmitter to become empty */

	do {

	while (1) {

		u32 sysflg = 0;



		regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);

	} while (sysflg & SYSFLG_UBUSY);

		if (!(sysflg & SYSFLG_UBUSY))

			break;

		cond_resched();

	}

}



static int uart_clps711x_console_setup(struct console *co, char *options)