diff options
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index fb867a9f55e9..d5da26f34cee 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -942,6 +942,10 @@ static void autoconfig_16550a(struct uart_8250_port *up) * Check for presence of the EFR when DLAB is set. * Only ST16C650V1 UARTs pass this test. */ +#ifndef CONFIG_ARCH_MXC + /* This test fails as EFR reads 0, but our uart requires LCR=0xBF + * to access EFR. + */ serial_outp(up, UART_LCR, UART_LCR_DLAB); if (serial_in(up, UART_EFR) == 0) { serial_outp(up, UART_EFR, 0xA8); @@ -955,6 +959,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) serial_outp(up, UART_EFR, 0); return; } +#endif /* * Maybe it requires 0xbf to be written to the LCR. @@ -1477,7 +1482,12 @@ static void transmit_chars(struct uart_8250_port *up) count = up->tx_loadsz; do { +#ifdef CONFIG_ARCH_MXC + /* Seems like back-to-back accesses are a problem */ + serial_out_sync(up, UART_TX, xmit->buf[xmit->tail]); +#else serial_out(up, UART_TX, xmit->buf[xmit->tail]); +#endif xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); up->port.icount.tx++; if (uart_circ_empty(xmit)) |