From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Tue, 15 Apr 2014 23:08:08 +0000 (+0200)
Subject: firewire: ohci: enable MSI for VIA VT6315 rev 1, drop cycle timer quirk
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d151f9854f21;p=openwrt%2Fstaging%2Fblogic.git

firewire: ohci: enable MSI for VIA VT6315 rev 1, drop cycle timer quirk

Commit af0cdf494781 "firewire: ohci: fix regression with VIA VT6315,
disable MSI" acted upon a report against VT6315 rev 0:
http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-12/msg02301.html
$ lspci -nn
VIA Technologies, Inc. VT6315 Series Firewire Controller [1106:3403]

I now got a card with
$ lspci -nn
VIA Technologies, Inc. VT6315 Series Firewire Controller [1106:3403] (rev 01)
and this works fine with MSI enabled.

Second, I tested this VT6315 rev 1 without CYCLE_TIMER quirk flag using
http://me.in-berlin.de/~s5r6/linux1394/utils/test_cycle_time_v20100125.c
and found that this chip does in fact access the cycle timer atomically.

Things I can't test because I don't have the hardware:
  - whether VT6315 rev 0 really needs QUIRK_CYCLE_TIMER,
  - whether the VT6320 PCI device needs QUIRK_CYCLE_TIMER,
  - whether the VT6325 and VT6330 PCIe devices need QUIRK_CYCLE_TIMER
    and QUIRK_NO_MSI.

Hence, just add a whitelist entry specifically for VT6315 rev >= 1
without any quirk flags.  Before this entry we need an extra entry to
catch VT6315 rev <= 0 due to how our ID matching logic works.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 8db663219560..5b0934d0d968 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -282,6 +282,7 @@ static char ohci_driver_name[] = KBUILD_MODNAME;
 #define PCI_DEVICE_ID_TI_TSB82AA2	0x8025
 #define PCI_DEVICE_ID_VIA_VT630X	0x3044
 #define PCI_REV_ID_VIA_VT6306		0x46
+#define PCI_DEVICE_ID_VIA_VT6315	0x3403
 
 #define QUIRK_CYCLE_TIMER		0x1
 #define QUIRK_RESET_PACKET		0x2
@@ -334,6 +335,12 @@ static const struct {
 	{PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT630X, PCI_REV_ID_VIA_VT6306,
 		QUIRK_CYCLE_TIMER | QUIRK_IR_WAKE},
 
+	{PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT6315, 0,
+		QUIRK_CYCLE_TIMER | QUIRK_NO_MSI},
+
+	{PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT6315, PCI_ANY_ID,
+		0},
+
 	{PCI_VENDOR_ID_VIA, PCI_ANY_ID, PCI_ANY_ID,
 		QUIRK_CYCLE_TIMER | QUIRK_NO_MSI},
 };