| Date | Tue, 07 Dec 2010 17:00:21 -0800 | From | Greg KH <> | Subject | [244/289] serial: mfd: adjust the baud rate setting |
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2.6.36-stable review patch. If anyone has any objections, please let us know.
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From: Feng Tang <feng.tang@intel.com>
commit a5880a9e5bb40fbae55de60051d69a29091053c3 upstream.
Previous baud rate setting code only has been tested with 3.5M/9600/ 115200/230400/460800 bps, and recently we got a 3M bps device to test, which needs to modify current MUL register setting, and with this patch 2.5M/2M/1.5M/1M/0.5M should also work as they just use a MUL value scale down from 3M's.
Also got some reference register setting from silicon guys for different baud rates, which tries to keep the pre-scalar register value to 16.
Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/serial/mfd.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-)
--- a/drivers/serial/mfd.c +++ b/drivers/serial/mfd.c @@ -892,8 +892,7 @@ serial_hsu_set_termios(struct uart_port unsigned char cval, fcr = 0; unsigned long flags; unsigned int baud, quot; - u32 mul = 0x3600; - u32 ps = 0x10; + u32 ps, mul; switch (termios->c_cflag & CSIZE) { case CS5: @@ -937,20 +936,19 @@ serial_hsu_set_termios(struct uart_port ps = 0xC; quot = 1; break; - case 2500000: - mul = 0x2710; - ps = 0x10; - quot = 1; - break; case 18432000: mul = 0x2400; ps = 0x10; quot = 1; break; + case 3000000: + case 2500000: + case 2000000: case 1500000: - mul = 0x1D4C; - ps = 0xc; - quot = 1; + case 1000000: + case 500000: + /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */ + mul = baud / 500000 * 0x9C4; break; default: ;
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