diff options
Diffstat (limited to 'drivers/tty/serial/clps711x.c')
| -rw-r--r-- | drivers/tty/serial/clps711x.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c index b0eacb83f831..5e6fdb1ea73b 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) |