commit 66dd99c2033684169f04068f66c7f83f7da229b8
author Michal Simek <michal.simek@xilinx.com> Mon Apr 23 10:55:21 2018 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Mon Apr 23 11:12:22 2018 +0200
tree 97348ecd1134a6e2f5afb66c5540981266d2f60c
parent 903f9db10f18f735e62ba447147b6c434b6af003

tty: serial: xuartps: Setup early console when uartclk is also passed

Baudrate calculation depends on requested baudrate and uart clock.
This patch is checking that uartclk is also passed.

The same logic is used 8250_early.c/init_port function.

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

drivers/tty/serial/xilinx_uartps.c

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index abcb4d0..bd72dd8 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1181,7 +1181,7 @@ static int __init cdns_early_console_setup(struct earlycon_device *device,
 	/* only set baud if specified on command line - otherwise
 	 * assume it has been initialized by a boot loader.
 	 */
-	if (device->baud) {
+	if (port->uartclk && device->baud) {
 		u32 cd = 0, bdiv = 0;
 		u32 mr;
 		int div8;