diff options
Diffstat (limited to 'target/linux/generic/backport-4.14/181-earlycon-remove-hardcoded-port-uartclk-initialization-in-of_setup_earlycon.patch')
| -rw-r--r-- | target/linux/generic/backport-4.14/181-earlycon-remove-hardcoded-port-uartclk-initialization-in-of_setup_earlycon.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.14/181-earlycon-remove-hardcoded-port-uartclk-initialization-in-of_setup_earlycon.patch b/target/linux/generic/backport-4.14/181-earlycon-remove-hardcoded-port-uartclk-initialization-in-of_setup_earlycon.patch new file mode 100644 index 0000000000..a4df913840 --- /dev/null +++ b/target/linux/generic/backport-4.14/181-earlycon-remove-hardcoded-port-uartclk-initialization-in-of_setup_earlycon.patch @@ -0,0 +1,40 @@ +From 182ead3e418a20328b73152b8e81fc8b4cac3b0b Mon Sep 17 00:00:00 2001 +From: Michal Simek <michal.simek@xilinx.com> +Date: Wed, 25 Apr 2018 15:48:42 +0200 +Subject: earlycon: Remove hardcoded port->uartclk initialization in of_setup_earlycon + +From: Michal Simek <michal.simek@xilinx.com> + +commit 182ead3e418a20328b73152b8e81fc8b4cac3b0b upstream. + +There is no reason to initialize uartclk to BASE_BAUD * 16 for DT based +systems. + +[-stable comment: commit 31cb9a8575ca ("earlycon: initialise baud field + of earlycon device structure") has changed 8250_early.c behavior which + now tries to setup UART speed. + Already-backported upstream commit 0ff3ab701963 ("serial: 8250_early: + Only set divisor if valid clk & baud") handles properly uartclk not + being set but it still requires backporting fix for wrong uartclk val. + This fixes malformed early console output on arch-es with BASE_BAUD.] + +Fixes: 31cb9a8575ca ("earlycon: initialise baud field of earlycon device structure") +Signed-off-by: Michal Simek <michal.simek@xilinx.com> +Tested-by: Matt Redfearn <matt.redfearn@mips.com> +[rmilecki: add -stable comment and Fixes tag] +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/tty/serial/earlycon.c | 1 - + 1 file changed, 1 deletion(-) + +--- a/drivers/tty/serial/earlycon.c ++++ b/drivers/tty/serial/earlycon.c +@@ -254,7 +254,6 @@ int __init of_setup_earlycon(const struc + return -ENXIO; + } + port->mapbase = addr; +- port->uartclk = BASE_BAUD * 16; + + val = of_get_flat_dt_prop(node, "reg-offset", NULL); + if (val) |