serial: 8250: Fix initialisation of Quatech cards with the AMCC PCI chip

commit 9c5320f8d7d9a2cf623e65d50e1113f34d9b9eb1 upstream.

Fix the initialisation of older Quatech serial cards which are fitted with
the AMCC PCI Matchmaker interface chip.

Signed-off-by: Jonathan Woithe (jwoithe@just42.net)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 8790e34..8d3c0b5 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1260,10 +1260,10 @@ static int pci_quatech_init(struct pci_dev *dev)
                unsigned long base = pci_resource_start(dev, 0);
                if (base) {
                        u32 tmp;
-                       outl(inl(base + 0x38), base + 0x38);
+                       outl(inl(base + 0x38) | 0x00002000, base + 0x38);
                        tmp = inl(base + 0x3c);
                        outl(tmp | 0x01000000, base + 0x3c);
-                       outl(tmp, base + 0x3c);
+                       outl(tmp &= ~0x01000000, base + 0x3c);
                }
        }
        return 0;