This is a note to let you know that I've just added the patch titled
earlycon: add reg-offset to physical address before mapping
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
earlycon-add-reg-offset-to-physical-address-before-mapping.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1f66dd36bb18437397ea0d7882c52f7e3c476e15 Mon Sep 17 00:00:00 2001
From: Greentime Hu <green.hu@xxxxxxxxx>
Date: Tue, 13 Feb 2018 17:09:08 +0800
Subject: earlycon: add reg-offset to physical address before mapping
From: Greentime Hu <green.hu@xxxxxxxxx>
commit 1f66dd36bb18437397ea0d7882c52f7e3c476e15 upstream.
It will get the wrong virtual address because port->mapbase is not added
the correct reg-offset yet. We have to update it before earlycon_map()
is called
Signed-off-by: Greentime Hu <greentime@xxxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 088da2a17619 ("of: earlycon: Initialize port fields from DT properties")
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/earlycon.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -250,11 +250,12 @@ int __init of_setup_earlycon(const struc
}
port->mapbase = addr;
port->uartclk = BASE_BAUD * 16;
- port->membase = earlycon_map(port->mapbase, SZ_4K);
val = of_get_flat_dt_prop(node, "reg-offset", NULL);
if (val)
port->mapbase += be32_to_cpu(*val);
+ port->membase = earlycon_map(port->mapbase, SZ_4K);
+
val = of_get_flat_dt_prop(node, "reg-shift", NULL);
if (val)
port->regshift = be32_to_cpu(*val);
Patches currently in stable-queue which might be from green.hu@xxxxxxxxx are
queue-4.15/earlycon-add-reg-offset-to-physical-address-before-mapping.patch