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-rw-r--r--drivers/firewire/fw-ohci.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index b98d81967f70..d5d8177da6d9 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -181,6 +181,7 @@ struct fw_ohci {
int request_generation;
u32 bus_seconds;
bool old_uninorth;
+ bool bus_reset_packet_quirk;
/*
* Spinlock for accessing fw_ohci data. Never call out of
@@ -571,14 +572,19 @@ static __le32 *handle_ar_packet(struct ar_context *ctx, __le32 *buffer)
* generation. We only need this for requests; for responses
* we use the unique tlabel for finding the matching
* request.
+ *
+ * Alas some chips sometimes emit bus reset packets with a
+ * wrong generation. We set the correct generation for these
+ * at a slightly incorrect time (in bus_reset_tasklet).
*/
-
- if (evt == OHCI1394_evt_bus_reset)
- ohci->request_generation = (p.header[2] >> 16) & 0xff;
- else if (ctx == &ohci->ar_request_ctx)
+ if (evt == OHCI1394_evt_bus_reset) {
+ if (!ohci->bus_reset_packet_quirk)
+ ohci->request_generation = (p.header[2] >> 16) & 0xff;
+ } else if (ctx == &ohci->ar_request_ctx) {
fw_core_handle_request(&ohci->card, &p);
- else
+ } else {
fw_core_handle_response(&ohci->card, &p);
+ }
return buffer + length + 1;
}
@@ -1285,6 +1291,9 @@ static void bus_reset_tasklet(unsigned long data)
context_stop(&ohci->at_response_ctx);
reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_busReset);
+ if (ohci->bus_reset_packet_quirk)
+ ohci->request_generation = generation;
+
/*
* This next bit is unrelated to the AT context stuff but we
* have to do it under the spinlock also. If a new config rom
@@ -2360,6 +2369,8 @@ pci_probe(struct pci_dev *dev, const struct pci_device_id *ent)
ohci->old_uninorth = dev->vendor == PCI_VENDOR_ID_APPLE &&
dev->device == PCI_DEVICE_ID_APPLE_UNI_N_FW;
#endif
+ ohci->bus_reset_packet_quirk = dev->vendor == PCI_VENDOR_ID_TI;
+
spin_lock_init(&ohci->lock);
tasklet_init(&ohci->bus_reset_tasklet,