On 9/17/2013 8:40 PM, Robert Hancock wrote: > On Tue, Sep 17, 2013 at 6:35 PM, Bruce Link wrote: >>> Hello, >>> >>> On Fri, Sep 06, 2013 at 07:53:49PM -0600, Robert Hancock wrote: >>>>> Is there any more information I can supply that would be helpful? >>>> I'm not quite sure what the next step would be. It's quite possible >>>> that the NVIDIA driver in Windows is doing some magic to work around >>>> the problem that we don't know about, but it's hard to say what that >>>> might be. The fact that the default drivers used in the WinPE boot >>>> don't seem to work would tend to point toward some kind of hardware >>>> incompatibility issue. >>>> >>>> Tejun, think you poked with some of this stuff before - any ideas? >>> It has been years since I looked at MCP quirks, of which there are too >>> many. It's likely another quirk on the controller side that nvidia >>> worked around somehow without telling anyone. Given the history and >>> that nvidia is out of chipset market, I think it's highly unlikely to >>> learn what the issue and workaround are without reverse engineering >>> it. So, um, no idea. >>> >>> Thanks. >>> >>> -- >>> tejun >>> -- >> >> Robert, >> >> I've inquired about this problem with Allen Martin at Nvidia, he had the >> following reply: >> >> /--------SNIP---------------/ >> Hi Bruce, I did work on the Windows SATA driver for those chipsets, so I’m >> familiar with it. I’m not aware of any of any timing workarounds for any >> devices in the driver, but it’s certainly true that there are devices that >> have timing sensitivity, especially around the IDENTIFY command and it may >> inadvertently work with one driver and not another. >> >> From the bug reports it looks like it’s always timing out on a >> TEST_UNIT_READY command? I assume this is probably the first command sent >> down after IDENTIFY to check for presense of a CD in the drive? If so it’s >> likely the drive is locked up and any command at that point will fail. If >> you want to test out the theory about it being a timing issue, I would stick >> some udelay()s in the identify code path, both before and after starting the >> transfer to see if it makes any difference. Also do you know if the driver >> does a PHY reset when it resets the link? If not, you can try doing that by >> writing a 0 to SControl and then restoring it with the original value. >> >> Hope this helps, >> >> -Allen >> /--------SNIP---------------/ >> >> Does this provide any actionable information? I've tried searching for the >> proper location to impliment these delays in the sata_nv.c and libata-eh.c >> files but admittedly, am in over my head. > Don't think there's any earth-shaking revelations but it might be a > few things to try. First, though, apparently there is a firmware > update for this drive of at least one revision up (WL0G) available > from Lite-ON that you could try updating to. (You'll likely need to > use Windows for that.) Given that it seems broken in at least two > different environments on this controller, it's possible they fixed > something related in the drive. Robert, I can report that the new firmware for the drive does not solve the problem. watchtv@teevee:~$ dmesg |grep ata5 [ 1.090360] ata5: SATA max UDMA/133 cmd 0x9e0 ctl 0xbe0 bmdma 0xc400 irq 20 [ 1.556044] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 1.564199] ata5.00: ATAPI: ATAPI iHOS104, WL0G, max UDMA/100 [ 1.580140] ata5.00: configured for UDMA/100 [ 6.580035] ata5.00: qc timeout (cmd 0xa0) [ 6.580043] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 7.048042] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 7.072124] ata5.00: configured for UDMA/100 [ 12.072029] ata5.00: qc timeout (cmd 0xa0) [ 12.072037] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 12.072041] ata5: limiting SATA link speed to 1.5 Gbps [ 12.072043] ata5.00: limiting speed to UDMA/100:PIO3 [ 12.540058] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 12.564141] ata5.00: configured for UDMA/100 [ 17.564038] ata5.00: qc timeout (cmd 0xa0) [ 17.564045] ata5.00: TEST_UNIT_READY failed (err_mask=0x4) [ 17.564048] ata5.00: disabled [ 17.564063] ata5: hard resetting link [ 17.564065] ata5: nv: skipping hardreset on occupied port [ 18.032068] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 18.032082] ata5: EH complete watchtv@teevee:~$ My apologies for not noticing the firmware update earlier. I do recall checking at one time, though it may have been prior to Sept. 2011. Bruce