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authorMagnus Damm <damm@opensource.se>2009-12-22 03:37:28 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-12-24 14:50:55 +0900
commit154280fd0e890814a249bf4a79b4340fb367f1a7 (patch)
tree50b5fcc1763329a72526385d063884e433144b8c
parent2f99f5c8f05e02f3df1bb4d93b6704e6f5972872 (diff)
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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: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--drivers/serial/sh-sci.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 68c7f6cfd72..a8869905113 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -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 {