[linux-yocto] [PATCH 05/18] serial: 8250_dw: allow lower reference frequencies

Tan Jui Nee jui.nee.tan at intel.com
Fri Jun 10 00:52:06 PDT 2016

From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

We have couple of standard but rare used baudrates which are not supported by
1,8432MHz reference frequency. Besides that user can potentially ask for any
baudrate (via BOTHER flag) and we currently don't fully support that. Since
clk-fractional-divider is moved to use rational best approximation for
reference frequency we may amend the driver to support whatever user wants.

Acked-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Signed-off-by: Stephen Boyd <sboyd at codeaurora.org>
(cherry picked from commit 3b4261dcf65993f95de80a0d63c5299aab922bd8)
Signed-off-by: Tan Jui Nee <jui.nee.tan at intel.com>
 drivers/tty/serial/8250/8250_dw.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 06324f1..df3eddf 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -224,10 +224,6 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 	if (IS_ERR(d->clk) || !old)
 		goto out;
-	/* Not requesting clock rates below 1.8432Mhz */
-	if (baud < 115200)
-		baud = 115200;
 	rate = clk_round_rate(d->clk, baud * 16);
 	ret = clk_set_rate(d->clk, rate);

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