4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ji-Ze Hong (Peter Hong) hpeter@gmail.com
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) hpeter+linux_kernel@gmail.com Signed-off-by: Ji-Ze Hong (Peter Hong) hpeter+linux_kernel@gmail.com Reviewd-by: Alan Cox alan@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/tty/serial/8250/8250_fintek.c | 3 +++ 1 file changed, 3 insertions(+)
--- 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 bas 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;