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serial: 8250_pci: more BayTrail error-free bauds
Support the following additional baud rates with 0% error: 500000, 1500000, 2500000, 3500000 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>
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@ -1366,22 +1366,43 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios,
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struct ktermios *old)
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{
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unsigned int baud = tty_termios_baud_rate(termios);
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unsigned int m = 6912;
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unsigned int n = 15625;
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unsigned int m, n;
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u32 reg;
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/* For baud rates 1M, 2M, 3M and 4M the dividers must be adjusted. */
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if (baud == 1000000 || baud == 2000000 || baud == 4000000) {
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/*
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* For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
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* dividers must be adjusted.
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*
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* uartclk = (m / n) * 100 MHz, where m <= n
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*/
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switch (baud) {
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case 500000:
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case 1000000:
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case 2000000:
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case 4000000:
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m = 64;
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n = 100;
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p->uartclk = 64000000;
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} else if (baud == 3000000) {
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break;
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case 3500000:
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m = 56;
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n = 100;
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p->uartclk = 56000000;
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break;
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case 1500000:
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case 3000000:
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m = 48;
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n = 100;
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p->uartclk = 48000000;
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} else {
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break;
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case 2500000:
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m = 40;
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n = 100;
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p->uartclk = 40000000;
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break;
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default:
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m = 6912;
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n = 15625;
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p->uartclk = 44236800;
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}
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