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

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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>
This commit is contained in:
Daniel Glöckner 2011-01-11 00:42:14 +01:00 committed by Greg Kroah-Hartman
parent 9abff15dd6
commit f6c259a39f
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/ftdi_sio.c
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@ -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;