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authorAlexander Shiyan <shc_work@mail.ru>2014-03-11 15:30:01 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-03-17 16:13:24 -0700
commit63e3ad3252695a2b8c01b6f6c225e4537af08b85 (patch)
treebd4d67034f7f8b435d9be8c985dcedb9210f17af /drivers/tty
parent015355b70e074a8cc11da6ae4f82d45c5160358a (diff)
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: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/clps711x.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index b0eacb83f83..5e6fdb1ea73 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -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);
- u32 sysflg = 0;
- do {
+ /* Wait for FIFO is not full */
+ while (1) {
+ u32 sysflg = 0;
+
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)