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

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)
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 4697a514b80a..6063d1512429 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1259,10 +1259,10 @@ 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;