diff options
| author | Aaron Sierra <asierra@xes-inc.com> | 2014-03-03 19:54:36 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-08 22:24:53 -0800 |
| commit | 41d3f09913a930369a26616eedc02339d0455498 (patch) | |
| tree | b0124a1ee58d3e35f6bd59ed0465b1cfe0670171 /drivers/tty/serial/8250 | |
| parent | 50825c57ab80ea44cae6bdcd79ead61e3e4e4e4c (diff) | |
serial: 8250_pci: change BayTrail default uartclk
The Intel BayTrail HSUART power-on default reference clock is 44.2368 MHz,
but 73.728 MHz provides 0% error for additional "conventional" baud rates
above 460800 (e.g. 576000, 921600, and 1152000).
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index a3dbc4d97fa2..b14bcba96c25 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1401,9 +1401,9 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios, p->uartclk = 40000000; break; default: - m = 6912; - n = 15625; - p->uartclk = 44236800; + m = 2304; + n = 3125; + p->uartclk = 73728000; } /* Reset the clock */ @@ -3470,6 +3470,10 @@ static struct pciserial_board pci_boards[] = { .base_baud = 921600, .reg_shift = 2, }, + /* + * Intel BayTrail HSUART reference clock is 44.2368 MHz at power-on, + * but is overridden by byt_set_termios. + */ [pbn_byt] = { .flags = FL_BASE0, .num_ports = 1, |