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Commit 50825c57 authored by Aaron Sierra's avatar Aaron Sierra Committed by Greg Kroah-Hartman
Browse files

serial: 8250_pci: more BayTrail error-free bauds 



Support the following additional baud rates with 0% error:
	500000, 1500000, 2500000, 3500000

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 013daec9

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

+29 −8
Original line number Diff line number Diff line
@@ -1366,22 +1366,43 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios, 
		struct ktermios *old)

{

	unsigned int baud = tty_termios_baud_rate(termios);

	unsigned int m = 6912;

	unsigned int n = 15625;

	unsigned int m, n;

	u32 reg;



	/* For baud rates 1M, 2M, 3M and 4M the dividers must be adjusted. */

	if (baud == 1000000 || baud == 2000000 || baud == 4000000) {

	/*

	 * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the

	 * dividers must be adjusted.

	 *

	 * uartclk = (m / n) * 100 MHz, where m <= n

	 */

	switch (baud) {

	case 500000:

	case 1000000:

	case 2000000:

	case 4000000:

		m = 64;

		n = 100;



		p->uartclk = 64000000;

	} else if (baud == 3000000) {

		break;

	case 3500000:

		m = 56;

		n = 100;

		p->uartclk = 56000000;

		break;

	case 1500000:

	case 3000000:

		m = 48;

		n = 100;



		p->uartclk = 48000000;

	} else {

		break;

	case 2500000:

		m = 40;

		n = 100;

		p->uartclk = 40000000;

		break;

	default:

		m = 6912;

		n = 15625;

		p->uartclk = 44236800;

	}