diff options
| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-10-17 14:09:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-28 21:51:29 -0700 |
| commit | 14d7e74a7f658fdd370e9a790b55e3b93eb259fc (patch) | |
| tree | a5c3f5ba4c72b04a368015242f7e26cbda427110 | |
| parent | fe17f612b3ea86e7af439432fc6b7d6d5e15d508 (diff) | |
firewire: ohci: fix TI TSB82AA2 regression since 2.6.35
commit aa0170fff3c26bf2b42159af2dd9cf86444c292a upstream.
Revert commit 54672386ccf36ffa21d1de8e75624af83f9b0eeb
"firewire: ohci: fix up configuration of TI chips".
It caused massive slow-down and data corruption with a TSB82AA2 based
StarTech EC1394B2 ExpressCard and FireWire 800 harddisks.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/657081
http://thread.gmane.org/gmane.linux.kernel.firewire.user/4013
The fact that some card EEPROMs do not program these enhancements may be
related to TSB81BA3 phy chip errata, if not to bugs of TSB82AA2 itself.
We could re-add these configuration steps, but only conditional on a
whitelist of cards on which these enhancements bring a proven positive
effect.
Reported-and-tested-by: Eric Shattow <lucent@gmail.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/firewire/ohci.c | 19 | ||||
| -rw-r--r-- | drivers/firewire/ohci.h | 8 |
2 files changed, 1 insertions, 26 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 9f627e758cf..4b521dd5a9d 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -2439,7 +2439,7 @@ static int __devinit pci_probe(struct pci_dev *dev, const struct pci_device_id *ent) { struct fw_ohci *ohci; - u32 bus_options, max_receive, link_speed, version, link_enh; + u32 bus_options, max_receive, link_speed, version; u64 guid; int i, err, n_ir, n_it; size_t size; @@ -2492,23 +2492,6 @@ static int __devinit pci_probe(struct pci_dev *dev, if (param_quirks) ohci->quirks = param_quirks; - /* TI OHCI-Lynx and compatible: set recommended configuration bits. */ - if (dev->vendor == PCI_VENDOR_ID_TI) { - pci_read_config_dword(dev, PCI_CFG_TI_LinkEnh, &link_enh); - - /* adjust latency of ATx FIFO: use 1.7 KB threshold */ - link_enh &= ~TI_LinkEnh_atx_thresh_mask; - link_enh |= TI_LinkEnh_atx_thresh_1_7K; - - /* use priority arbitration for asynchronous responses */ - link_enh |= TI_LinkEnh_enab_unfair; - - /* required for aPhyEnhanceEnable to work */ - link_enh |= TI_LinkEnh_enab_accel; - - pci_write_config_dword(dev, PCI_CFG_TI_LinkEnh, link_enh); - } - ar_context_init(&ohci->ar_request_ctx, ohci, OHCI1394_AsReqRcvContextControlSet); diff --git a/drivers/firewire/ohci.h b/drivers/firewire/ohci.h index 3bc9a5d744e..d49e1469a98 100644 --- a/drivers/firewire/ohci.h +++ b/drivers/firewire/ohci.h @@ -154,12 +154,4 @@ #define OHCI1394_phy_tcode 0xe -/* TI extensions */ - -#define PCI_CFG_TI_LinkEnh 0xf4 -#define TI_LinkEnh_enab_accel 0x00000002 -#define TI_LinkEnh_enab_unfair 0x00000080 -#define TI_LinkEnh_atx_thresh_mask 0x00003000 -#define TI_LinkEnh_atx_thresh_1_7K 0x00001000 - #endif /* _FIREWIRE_OHCI_H */ |