diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_pci.c | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 0ff3e3624d4c..a3dbc4d97fa2 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -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; } |