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Commit 154280fd authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
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serial: sh-sci: earlyprintk zero uartclk fix 



This establishes a sensible max baud rate for the earlyprintk cases where
the port's uartclk has not yet been determined.

Signed-off-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 2f99f5c8

drivers/serial/sh-sci.c

+13 −3
Original line number Diff line number Diff line
@@ -897,11 +897,21 @@ static void sci_shutdown(struct uart_port *port) 
static void sci_set_termios(struct uart_port *port, struct ktermios *termios,

			    struct ktermios *old)

{

	unsigned int status, baud, smr_val;

	unsigned int status, baud, smr_val, max_baud;

	int t = -1;



	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);

	if (likely(baud))

	/*

	 * earlyprintk comes here early on with port->uartclk set to zero.

	 * the clock framework is not up and running at this point so here

	 * we assume that 115200 is the maximum baud rate. please note that

	 * the baud rate is not programmed during earlyprintk - it is assumed

	 * that the previous boot loader has enabled required clocks and

	 * setup the baud rate generator hardware for us already.

	 */

	max_baud = port->uartclk ? port->uartclk / 16 : 115200;



	baud = uart_get_baud_rate(port, termios, old, 0, max_baud);

	if (likely(baud && port->uartclk))

		t = SCBRR_VALUE(baud, port->uartclk);



	do {