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SubjectRe: libata_uli puts second channel to PIO4 on 2.6.18
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

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