linux-kernel - [PATCH] tty: serial: xuartps: Setup early console when uartclk is also passed

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Message-Id: <2ef5ac478f8d32bc807ead758eb5d60744a44515.1523367208.git.michal.simek@xilinx.com>
Date:   Tue, 10 Apr 2018 15:33:30 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] 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@...inx.com>
---

 drivers/tty/serial/xilinx_uartps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index b9b2bc76bcac..a654cda203c7 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;
-- 
1.9.1