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serial: sh-sci: earlyprintk zero uartclk fix

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

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-12-22 03:37:28 +00:00 committed by Paul Mundt
parent 2f99f5c8f0
commit 154280fd0e
1 changed files with 13 additions and 3 deletions
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16
drivers/serial/sh-sci.c
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@ -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 {