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tty: xuartps: Print warning in clock notifier

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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>
This commit is contained in:
Soren Brinkmann 2014-04-04 17:23:40 -07:00 committed by Greg Kroah-Hartman
parent e555a21149
commit 5ce15d2d1e
1 changed files with 3 additions and 1 deletions
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4
drivers/tty/serial/xilinx_uartps.c
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@ -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);