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[3.11,067/233] serial: 8250: Fix initialisation of Quatech cards with the AMCC PCI chip

Message ID 1391773652-25214-68-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques Feb. 7, 2014, 11:44 a.m. UTC 
3.11.10.4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jonathan Woithe <jwoithe@just42.net>

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>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/tty/serial/8250/8250_pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index c52948b..1431e0a 100644
--- 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;