Andrew Morton wrote:
quoted text
> (argh, shit, resent.  Please don't massage the cc list.  Do reply-to-all)
> 
> On Thu, 6 Dec 2007 01:33:16 +0000 (UTC)
> Parag Warudkar <parag.warudkar@gmail.com> wrote:
> 
>> Tom Lanyon <tomlanyon <at> gmail.com> writes:
>>
>>> scsi4: ahci
>>> ata5: SATA link up at 1.5 Gbps (SStatus 113 SControl 300)
>>> ata5.00: ATAPI, max UDMA/66
>>> ata5.00: qc timeout (cmd 0xef)
>>> ata5.00: failed to set xfermode (err_mask=0x104)
>>> ata5.00: limiting speed to UDMA/44
>>> ata5: failed to recover some devices, retrying in 5 secs
>>> ata5: port is slow to respond, please be patient (Status 0x80)
>>> ata5: port failed to respond (30 secs, status 0x80)
>>> ata5: COMRESET failed (device not ready)
>>> ata5: hardreset failed, retrying in 5 secs
>>> ata5: SATA link up at 1.5 Gbps (SStatus 113 SControl 300)
>>> ata5.00: ATAPI, max UDMA/66
>>> ata5.00: qc timeout (cmd 0xef)
>>> ata5.00: failed to set xfermode (err_mask=0x104)
>>> ata5.00: limiting speed to PIO0
>>> ata5: failed to recover some devices, retrying in 5 secs
>>> ata5: port is slow to respond, please be patient (Status 0x80)
>>> ata5: port failed to respond (30 secs, status 0x80)
>>> ata5: COMRESET failed (device not ready)
>>> ata5: hardreset failed, retrying in 5 secs
>>> ata5.00: ATAPI, max UDMA/66
>>> ata5.00: qc timeout (cmd 0xef)
>>> ata5.00: failed to set xfermode (err_mask=0x104)
>>> ata5.00: disabled
>>>
>> Looks like it is trying to set transfer mode to UDMA/66 and failing. After 
>> that it tried UDMA/44 and failed again. Next UDMA/66 again with unsurprising 
>> result - failed. After that PIO0 which seems to cause some kind of trouble, 
>> then it tries UDMA/66 again, and I am not stating the result again :) ! 
>>
>>> Any ideas what to try to get it working under AHCI?
>>>
>> I recall reading somewhere - the Pioneer drive needs UDMA/33 which it did not 
>> try in your case - need to some how have it try UDMA/33 but I don't find a 
>> boot parameter which will do that. So may be adding a quirk for this device to 
>> limit the xfer mode to 33 may work. 
>>
>> What does your dmesg output for the drives look like when you run in IDE 
>> compat mode? (Particularly the DMA for this drive?)
>>

Also, does irqpoll help?

-- 
tejun
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