From: Soren Brinkmann <soren.brinkmann@xilinx.com>
Date: Sat, 5 Apr 2014 00:23:40 +0000 (-0700)
Subject: tty: xuartps: Print warning in clock notifier
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5ce15d2d1efb9cacab9a331c730cc805124ee612;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

tty: xuartps: Print warning in clock notifier

Print a warning if the clock notifier rejects a clock frequency change
to facilitate debugging (see:
http://thread.gmane.org/gmane.linux.ports.arm.kernel/304329/focus=304379)

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 787a12064fa0..814391038abb 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -429,8 +429,10 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
 		 * frequency.
 		 */
 		if (!xuartps_calc_baud_divs(ndata->new_rate, xuartps->baud,
-					&bdiv, &cd, &div8))
+					&bdiv, &cd, &div8)) {
+			dev_warn(port->dev, "clock rate change rejected\n");
 			return NOTIFY_BAD;
+		}
 
 		spin_lock_irqsave(&xuartps->port->lock, flags);