From f9e4a960a271e4bfcbbc668c6d31bc1eebd755be Mon Sep 17 00:00:00 2001 From: "Ji-Ze Hong (Peter Hong)" Date: Tue, 17 Oct 2017 14:23:08 +0800 Subject: [PATCH] serial: 8250_fintek: Fix finding base_port with activated SuperIO commit fd97e66c5529046e989a0879c3bb58fddb592c71 upstream. The SuperIO will be configured at boot time by BIOS, but some BIOS will not deactivate the SuperIO when the end of configuration. It'll lead to mismatch for pdata->base_port in probe_setup_port(). So we'll deactivate all SuperIO before activate special base_port in fintek_8250_enter_key(). Tested on iBASE MI802. Tested-by: Ji-Ze Hong (Peter Hong) Signed-off-by: Ji-Ze Hong (Peter Hong) Reviewd-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_fintek.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c index e500f7dd2470a..4bd376c08b59f 100644 --- a/drivers/tty/serial/8250/8250_fintek.c +++ b/drivers/tty/serial/8250/8250_fintek.c @@ -118,6 +118,9 @@ static int fintek_8250_enter_key(u16 base_port, u8 key) if (!request_muxed_region(base_port, 2, "8250_fintek")) return -EBUSY; + /* Force to deactive all SuperIO in this base_port */ + outb(EXIT_KEY, base_port + ADDR_PORT); + outb(key, base_port + ADDR_PORT); outb(key, base_port + ADDR_PORT); return 0; -- 2.47.2