serial: mfd: adjust the baud rate setting
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> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -900,8 +900,7 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
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unsigned char cval, fcr = 0;
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unsigned char cval, fcr = 0;
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unsigned long flags;
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unsigned long flags;
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unsigned int baud, quot;
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unsigned int baud, quot;
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u32 mul = 0x3600;
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u32 ps, mul;
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u32 ps = 0x10;
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switch (termios->c_cflag & CSIZE) {
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switch (termios->c_cflag & CSIZE) {
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case CS5:
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case CS5:
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@ -943,31 +942,24 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
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baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
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baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
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quot = 1;
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quot = 1;
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ps = 0x10;
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mul = 0x3600;
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switch (baud) {
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switch (baud) {
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case 3500000:
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case 3500000:
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mul = 0x3345;
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mul = 0x3345;
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ps = 0xC;
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ps = 0xC;
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break;
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break;
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case 3000000:
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mul = 0x2EE0;
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break;
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case 2500000:
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mul = 0x2710;
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break;
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case 2000000:
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mul = 0x1F40;
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break;
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case 1843200:
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case 1843200:
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mul = 0x2400;
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mul = 0x2400;
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break;
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break;
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case 3000000:
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case 2500000:
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case 2000000:
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case 1500000:
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case 1500000:
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mul = 0x1770;
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break;
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case 1000000:
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case 1000000:
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mul = 0xFA0;
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break;
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case 500000:
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case 500000:
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mul = 0x7D0;
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/* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
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mul = baud / 500000 * 0x9C4;
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break;
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break;
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default:
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default:
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/* Use uart_get_divisor to get quot for other baud rates */
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/* Use uart_get_divisor to get quot for other baud rates */
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