Re: libata PATA patch for 2.6.16-rc5

[matthieu castet <castet.matthieu@free.fr>]

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