Commit f6c259a3 authored Jan 11, 2011 by Daniel Glöckner Committed by Greg Kroah-Hartman Jan 22, 2011

USB: ftdi_sio: fix resolution of 2232H baud rate dividers



The 2232H high speed baud rates also support fractional baud
rate divisors, but when the performing the divisions before
the multiplication, the fractional bits are lost.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Acked-by: Mark Adamson <mark.adamson@ftdichip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent 9abff15d

drivers/usb/serial/ftdi_sio.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -955,7 +955,7 @@ static __u32 ftdi_2232h_baud_base_to_divisor(int baud, int base)
		int divisor3;

		/* hi-speed baud rate is 10-bit sampling instead of 16-bit */
		divisor3 = (base / 10 / baud) * 8;
		divisor3 = base * 8 / (baud * 10);

		divisor = divisor3 >> 3;
		divisor \|= (__u32)divfrac[divisor3 & 0x7] << 14;