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Commit 41d3f099 authored by Aaron Sierra's avatar Aaron Sierra Committed by Greg Kroah-Hartman
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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: default avatarAaron Sierra <asierra@xes-inc.com>
Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 50825c57

drivers/tty/serial/8250/8250_pci.c

+7 −3
Original line number Diff line number Diff line
@@ -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,