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Diffstat (limited to 'drivers/firewire/ohci.c')
-rw-r--r--drivers/firewire/ohci.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index ecddd11b797..3486bc49c17 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -34,6 +34,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
+#include <linux/pci_ids.h>
#include <linux/spinlock.h>
#include <linux/string.h>
@@ -2372,6 +2373,9 @@ static void ohci_pmac_off(struct pci_dev *dev)
#define ohci_pmac_off(dev)
#endif /* CONFIG_PPC_PMAC */
+#define PCI_VENDOR_ID_AGERE PCI_VENDOR_ID_ATT
+#define PCI_DEVICE_ID_AGERE_FW643 0x5901
+
static int __devinit pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
@@ -2422,6 +2426,11 @@ static int __devinit pci_probe(struct pci_dev *dev,
version = reg_read(ohci, OHCI1394_Version) & 0x00ff00ff;
ohci->use_dualbuffer = version >= OHCI_VERSION_1_1;
+ /* dual-buffer mode is broken if more than one IR context is active */
+ if (dev->vendor == PCI_VENDOR_ID_AGERE &&
+ dev->device == PCI_DEVICE_ID_AGERE_FW643)
+ ohci->use_dualbuffer = false;
+
/* x86-32 currently doesn't use highmem for dma_alloc_coherent */
#if !defined(CONFIG_X86_32)
/* dual-buffer mode is broken with descriptor addresses above 2G */