Commit 0d0389e5 authored by Yin Kangkai's avatar Yin Kangkai Committed by Greg Kroah-Hartman
Browse files

serial: change the divisor latch only when prescalar actually changed 



In 8250.c original ns16550 autoconfig code, we change the divisor latch when
we goto to high speed mode, we're assuming the previous speed is legacy. This
some times is not true.

For example in a system with both CONFIG_SERIAL_8250 and
CONFIG_SERIAL_8250_PNP set, in this case, the code (autoconfig) will be called
twice, one in serial8250_init/probe() and the other is from
serial_pnp_probe. When serial_pnp_probe calls the autoconfig for NS16550A,
it's already in high speed mode, change the divisor latch (quot << 3) in this
case will make the UART console garbled.

CC: Greg Kroah-Hartman <greg@kroah.com>
CC: David Woodhouse <dwmw2@infradead.org>
CC: linux-kernel@vger.kernel.org
CC: stable@kernel.org
Signed-off-by: default avatarYin Kangkai <kangkai.yin@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 95926d2d

drivers/tty/serial/8250.c

+20 −12
Original line number Diff line number Diff line
@@ -954,6 +954,23 @@ static int broken_efr(struct uart_8250_port *up) 
	return 0;

}



static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)

{

	unsigned char status;



	status = serial_in(up, 0x04); /* EXCR2 */

#define PRESL(x) ((x) & 0x30)

	if (PRESL(status) == 0x10) {

		/* already in high speed mode */

		return 0;

	} else {

		status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */

		status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */

		serial_outp(up, 0x04, status);

	}

	return 1;

}



/*

 * We know that the chip has FIFOs.  Does it have an EFR?  The

 * EFR is located in the same register position as the IIR and
@@ -1025,11 +1042,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) 
			quot = serial_dl_read(up);

			quot <<= 3;



			status1 = serial_in(up, 0x04); /* EXCR2 */

			status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */

			status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */

			serial_outp(up, 0x04, status1);



			if (ns16550a_goto_highspeed(up))

				serial_dl_write(up, quot);



			serial_outp(up, UART_LCR, 0);
@@ -3025,15 +3038,10 @@ void serial8250_resume_port(int line) 
	struct uart_8250_port *up = &serial8250_ports[line];



	if (up->capabilities & UART_NATSEMI) {

		unsigned char tmp;



		/* Ensure it's still in high speed mode */

		serial_outp(up, UART_LCR, 0xE0);



		tmp = serial_in(up, 0x04); /* EXCR2 */

		tmp &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */

		tmp |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */

		serial_outp(up, 0x04, tmp);

		ns16550a_goto_highspeed(up);



		serial_outp(up, UART_LCR, 0);

		up->port.uartclk = 921600*16;

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