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serial: 8250: Support XR17V35x fraction divisor

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The Exar XR17V35x family of UARTs have an additional fractional divisor
register (DLD) which was not being used. Calculate and set this
register for these devices to reduce their baud rate error.

Signed-off-by: Joe Schultz <jschultz@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joe Schultz 2014-02-11 18:30:01 -06:00 committed by Greg Kroah-Hartman
parent e2613be509
commit 45a7bd6359
1 changed files with 18 additions and 0 deletions
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18
drivers/tty/serial/8250/8250_core.c
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@ -2432,6 +2432,24 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
serial_dl_write(up, quot);
/*
* XR17V35x UARTs have an extra fractional divisor register (DLD)
*
* We need to recalculate all of the registers, because DLM and DLL
* are already rounded to a whole integer.
*
* When recalculating we use a 32x clock instead of a 16x clock to
* allow 1-bit for rounding in the fractional part.
*/
if (up->port.type == PORT_XR17V35X) {
unsigned int baud_x32 = (port->uartclk * 2) / baud;
u16 quot = baud_x32 / 32;
u8 quot_frac = DIV_ROUND_CLOSEST(baud_x32 % 32, 2);
serial_dl_write(up, quot);
serial_port_out(port, 0x2, quot_frac & 0xf);
}
/*
* LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
* is written without DLAB set, this mode will be disabled.