serial: mfd: adjust the baud rate setting (a5880a9e) · Commits · 戴 / test

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>

drivers/serial/mfd.c

+8 −16

Original line number	Diff line number	Diff line
		@@ -900,8 +900,7 @@ serial_hsu_set_termios(struct uart_port port, struct ktermios termios,
		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:
		@@ -943,31 +942,24 @@ serial_hsu_set_termios(struct uart_port port, struct ktermios termios,
		baud = uart_get_baud_rate(port, termios, old, 0, 4000000);

		quot = 1;
		ps = 0x10;
		mul = 0x3600;
		switch (baud) {
		case 3500000:
		mul = 0x3345;
		ps = 0xC;
		break;
		case 3000000:
		mul = 0x2EE0;
		break;
		case 2500000:
		mul = 0x2710;
		break;
		case 2000000:
		mul = 0x1F40;
		break;
		case 1843200:
		mul = 0x2400;
		break;
		case 3000000:
		case 2500000:
		case 2000000:
		case 1500000:
		mul = 0x1770;
		break;
		case 1000000:
		mul = 0xFA0;
		break;
		case 500000:
		mul = 0x7D0;
		/* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
		mul = baud / 500000 * 0x9C4;
		break;
		default:
		/* Use uart_get_divisor to get quot for other baud rates */

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