serial: also set the uartclk value in resume after goes to highspeed

commit 95926d2db6256e08d06b753752a0d903a0580acc upstream.

For any reason if the NS16550A was not work in high speed mode (e.g. we hold
NS16550A from going to high speed mode in autoconfig_16550a()), now we are
resume from suspend, we should also set the uartclk to the correct
value. Otherwise it is still the old 1843200 and that will bring issues.

CC: Greg Kroah-Hartman <greg@kroah.com>
CC: David Woodhouse <dwmw2@infradead.org>
CC: linux-kernel@vger.kernel.org
Signed-off-by: Yin Kangkai <kangkai.yin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 3975df6f7fdba6f4bff57f9c7fa05a8ae1bbeadf..c10a6a909c7641658aee66f0355f4fe309997e88 100644 (file)
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -3036,6 +3036,7 @@ void serial8250_resume_port(int line)
                serial_outp(up, 0x04, tmp);
 
                serial_outp(up, UART_LCR, 0);
+               up->port.uartclk = 921600*16;
        }
        uart_resume_port(&serial8250_reg, &up->port);
 }