The patch below does not apply to the 4.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f572a034d9e07157dd07d2b6be3a1459b5574b58 Mon Sep 17 00:00:00 2001

From: Greentime Hu greentime@andestech.com Date: Thu, 16 Nov 2017 19:33:35 +0800 Subject: [PATCH] earlycon: add reg-offset to physical address before mapping

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@andestech.com Acked-by: Arnd Bergmann arnd@arndb.de Acked-by: Rob Herring robh@kernel.org Cc: Peter Hurley peter@hurleysoftware.com Cc: stable@vger.kernel.org Fixes: 088da2a17619 ("of: earlycon: Initialize port fields from DT properties")

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 870e84fb6e39..a24278380fec 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -245,11 +245,12 @@ int __init of_setup_earlycon(const struct earlycon_id *match, } 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);