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Commit 45a7bd63 authored by Joe Schultz's avatar Joe Schultz Committed by Greg Kroah-Hartman
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serial: 8250: Support XR17V35x fraction divisor 



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: default avatarJoe Schultz <jschultz@xes-inc.com>
Signed-off-by: default avatarAaron Sierra <asierra@xes-inc.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e2613be5

drivers/tty/serial/8250/8250_core.c

+18 −0
Original line number Diff line number Diff line
@@ -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.