[openwrt/openwrt] bcm53xx: fix earlycon regression in kernel 4.14

[LEDE Commits]

rmilecki pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/707d11971612821829b0ce2002bece77e859dc52

commit 707d11971612821829b0ce2002bece77e859dc52
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Thu Mar 29 15:10:01 2018 +0200

    bcm53xx: fix earlycon regression in kernel 4.14
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 ...ycon-initialise-baud-field-of-earlycon-de.patch | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/target/linux/bcm53xx/patches-4.14/910-Revert-earlycon-initialise-baud-field-of-earlycon-de.patch b/target/linux/bcm53xx/patches-4.14/910-Revert-earlycon-initialise-baud-field-of-earlycon-de.patch
new file mode 100644
index 0000000..025781a
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.14/910-Revert-earlycon-initialise-baud-field-of-earlycon-de.patch
@@ -0,0 +1,33 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal at milecki.pl>
+Subject: [PATCH] Revert "earlycon: initialise baud field of earlycon device
+ structure"
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This reverts commit 31cb9a8575ca04f47ea113434d4782b695638b62.
+
+It broke earlycon on BCM5301X. Using:
+1) uartclk 1843200 (BASE_BAUD * 16)
+2) early_console_dev.baud 115200
+results in init_port() calculating UART divisor 1. That's a wrong value
+(default one is 54) that breaks serial console output.
+
+Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
+---
+
+--- a/drivers/tty/serial/earlycon.c
++++ b/drivers/tty/serial/earlycon.c
+@@ -283,12 +283,7 @@ int __init of_setup_earlycon(const struc
+ 		}
+ 	}
+ 
+-	val = of_get_flat_dt_prop(node, "current-speed", NULL);
+-	if (val)
+-		early_console_dev.baud = be32_to_cpu(*val);
+-
+ 	if (options) {
+-		early_console_dev.baud = simple_strtoul(options, NULL, 0);
+ 		strlcpy(early_console_dev.options, options,
+ 			sizeof(early_console_dev.options));
+ 	}