Commit aa0170ff authored by Stefan Richter's avatar Stefan Richter
Browse files

firewire: ohci: fix TI TSB82AA2 regression since 2.6.35 

Revert commit 54672386
"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: default avatarEric Shattow <lucent@gmail.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org> 2.6.35
Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent cd07202c

drivers/firewire/ohci.c

+1 −18
Original line number Diff line number Diff line
@@ -2840,7 +2840,7 @@ 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;
@@ -2894,23 +2894,6 @@ 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);

drivers/firewire/ohci.h

+0 −8
Original line number Diff line number Diff line
@@ -155,12 +155,4 @@ 


#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 */

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