Re: libata_uli puts second channel to PIO4 on 2.6.18

[Patric Karlsson]

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@xxxxxxxxx>
> > 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@xxxxxxxxx>
> >    Signed-off-by: Jeff Garzik <jeff@xxxxxxxxxx>
> >
> > 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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