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SubjectRe: libata_uli puts second channel to PIO4 on 2.6.18
Date
Patric Karlsson wrote:
> Grzegorz Kulewski wrote:
>> On Wed, 7 Feb 2007, Tejun Heo wrote:
>>> Grzegorz Kulewski wrote:
>>>> It worked very well for half a year but with one disk (IIRC it was
>>>> even
>>>> plugged into second channel but I wont bet on it). Now I have
>>>> second disk
>>>> (very similar) and it is always put into PIO4 mode:
>>>>
>>>> [ 17.404451] libata version 2.00 loaded.
>>>> [ 17.404916] sata_uli 0000:00:04.0: version 1.0
>>>> [ 17.405009] ACPI: PCI Interrupt 0000:00:04.0[A] -> GSI 18
>>>> (level, low)
>>>> -> IRQ 185
>>>> [ 17.405223] ata1: SATA max UDMA/133 cmd 0xD400 ctl 0xD002 bmdma
>>>> 0xB000
>>>> irq 185
>>>> [ 17.405385] ata2: SATA max UDMA/133 cmd 0xB800 ctl 0xB402 bmdma
>>>> 0xB008
>>>> irq 185
>>>> [ 17.405519] scsi2 : sata_uli
>>>> [ 17.858803] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
>>>> [ 17.880541] ata1.00: ATA-7, max UDMA/133, 488397168 sectors:
>>>> LBA48 NCQ
>>>> (depth 0/32)
>>>> [ 17.880660] ata1.00: ata1: dev 0 multi count 16
>>>> [ 17.888858] ata1.00: configured for UDMA/133
>>>> [ 17.888941] scsi3 : sata_uli
>>>> [ 18.342469] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
>>>> [ 18.343573] ata2.00: ATA-7, max UDMA/133, 488397168 sectors:
>>>> LBA48 NCQ
>>>> (depth 0/32)
>>>> [ 18.343691] ata2.00: ata2: dev 0 multi count 16
>>>> [ 18.344972] ata2.00: configured for PIO4
>>>
>>> Some uli controllers have simplex bit stuck high indicating that they
>>> can't perform DMA transfers simultaneously on both channels. In this
>>> case, libata configures the second channel as PIO only. This has been
>>> worked around by the following commit.
>>>
>>> commit b2a8bbe67d73631c71492fd60b757fc50a87f182
>>> Author: Tejun Heo <htejun@gmail.com>
>>> Date: Thu Jan 25 19:40:05 2007 +0900
>>>
>>> libata: implement ATA_FLAG_IGN_SIMPLEX and use it in sata_uli
>>>
>>> Some uli controllers have stuck SIMPLEX bit which can't be cleared
>>> with ata_pci_clear_simplex(), but the controller is capable of doing
>>> DMAs on both channels simultaneously. Implement ATA_FLAG_IGN_SIMPLEX
>>> which makes libata ignore the simplex bit and use it in sata_uli.
>>>
>>> Signed-off-by: Tejun Heo <htejun@gmail.com>
>>> Signed-off-by: Jeff Garzik <jeff@garzik.org>
>>>
>>> For quick fix, just comment out lines which set ATA_HOST_SIMPLEX in
>>> drivers/scsi/libata-bmdma.c. e.g.
>>>
>>> /*if (inb(bmdma + 2) & 0x80)
>>> probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;*/
>>
>> Thanks! After this fix it is working ok. Any chance to see the proper
>> fix in -stable kernels for at least 2.6.18.x and 2.6.19.x?
>>
>>
>> Thanks,
>>
>> Grzegorz Kulewski
>>
>
> I was wondering the same thing. While I could patch the kernel, and make
> a custom build. I prefer not to, and just upgrade to a newer version.
>
> /Patric
>
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>
Nevermind, I got the date wrong. This was fixed in Linux 2.6.20-rc7.
Sorry for not reseaching it more.

/Patric

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