diff options
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/ohci.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index d6ba897b219..bf5e1128442 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -1817,13 +1817,14 @@ static u64 ohci_get_bus_time(struct fw_card *card) c2 = reg_read(ohci, OHCI1394_IsochronousCycleTimer); } else { /* - * VIA controllers have two bugs when updating the iso cycle - * timer register: - * 1) When the lowest six bits are wrapping around to zero, + * Some controllers exhibit one or more of the following bugs + * when updating the iso cycle timer register: + * - When the lowest six bits are wrapping around to zero, * a read that happens at the same time will return garbage * in the lowest ten bits. - * 2) When the cycleOffset field wraps around to zero, the + * - When the cycleOffset field wraps around to zero, the * cycleCount field is not incremented for about 60 ns. + * - Occasionally, the entire register reads zero. * * To catch these, we read the register three times and ensure * that the difference between each two consecutive reads is @@ -2542,7 +2543,9 @@ static int __devinit pci_probe(struct pci_dev *dev, #endif ohci->bus_reset_packet_quirk = dev->vendor == PCI_VENDOR_ID_TI; - ohci->iso_cycle_timer_quirk = dev->vendor == PCI_VENDOR_ID_VIA; + ohci->iso_cycle_timer_quirk = dev->vendor == PCI_VENDOR_ID_AL || + dev->vendor == PCI_VENDOR_ID_NEC || + dev->vendor == PCI_VENDOR_ID_VIA; ar_context_init(&ohci->ar_request_ctx, ohci, OHCI1394_AsReqRcvContextControlSet); |