Re: libata PATA patch for 2.6.16-rc5

[matthieu castet]

Hi,

matthieu castet wrote:
> Hi Alan
>
> Alan Cox wrote:
>
> > On Maw, 2006-02-28 at 23:36 +0100, matthieu castet wrote:
> >
> > > for the SIL680 I have a 100Mhz clock instead of a 133Mhz with ide/pci 
> > > driver [1]
> >
> >
> >
> > Fixed (missing break in switch)
> >
> >
> > > The ATAPI doesn't seem to work fine with VIA.
> >
> >
> >
> > Still investigating
> If it can help you, I attach a log with debug enabled.
Ok, I think I have a hint.

The drive that is failling is the secondary slave [1].
When I try to change xfermode with hdparm -X, it take some times (10 s) 
and I found an error in the kernel log.
But even with that error, it seem the xfermode is changed.

What happen with libata if we lose an interrupt ?


Matthieu




[1]
/dev/hdd:

ATAPI CD-ROM, with removable media
        Model Number:       CD-RW   CDR-6S48
        Serial Number:
        Firmware Revision:  SSG5
Standards:
        Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
        Supported: CD-ROM ATAPI-2
Configuration:
        DRQ response: 50us.
        Packet size: 12 bytes
Capabilities:
        LBA, IORDY(cannot be disabled)
        DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=227ns  IORDY flow control=120ns

[2]
hdd: lost interrupt
hdd: CHECK for good STATUS
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