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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>
This commit is contained in:
Aaron Sierra 2014-03-03 19:54:36 -06:00 committed by Greg Kroah-Hartman
parent 50825c57ab
commit 41d3f09913
1 changed files with 7 additions and 3 deletions
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10
drivers/tty/serial/8250/8250_pci.c
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@ -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,