RE: ATAPI devices in AHCI mode not working

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>-----Original Message-----
>From: linux-ide-owner@xxxxxxxxxxxxxxx [mailto:linux-ide-
>owner@xxxxxxxxxxxxxxx] On Behalf Of Tejun Heo
>Sent: Wednesday, October 31, 2007 1:07 AM
>To: Gaston, Jason D
>Cc: Alan Cox; linux-ide@xxxxxxxxxxxxxxx
>Subject: Re: ATAPI devices in AHCI mode not working
>
>Gaston, Jason D wrote:
>>> -----Original Message-----
>>> From: Alan Cox [mailto:alan@xxxxxxxxxxxxxxxxxxx]
>>> Sent: Monday, October 29, 2007 3:14 PM
>>> To: Gaston, Jason D
>>> Cc: linux-ide@xxxxxxxxxxxxxxx
>>> Subject: Re: ATAPI devices in AHCI mode not working
>>>
>>>> ata1: SATA max UDMA/133 abar m1024@0xd9101000 port 0xd9101100 irq
216
>>>> ata2: SATA max UDMA/133 abar m1024@0xd9101000 port 0xd9101180 irq
216
>>>> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>>>> ata1.00: ATAPI: ATAPI   DVD D  DH16D2S, EP52, max UDMA/100
>>>> ata1.00: configured for UDMA/100
>>> Much better - no misdetected link type, no device claiming to be
PATA
>>> when its SATA.
>>>
>>>
>>> Right that eliminates all the obvious goings on being caused by
broken
>>> devices which is a start. Doesn't shed any light on the rest of it.
>> What
>>> happens if you boot with irqpoll enabled ? (wondering if the
timeouts
>> are
>>> ACPI or IRQ routing stuff)
>>
>> I rebuilt the kernel; the DVD and USB devices are functional now. I'm
>> not sure what the problem was before.  On a side note: In 2.6.24.rc1
the
>> DVD starts working right away, but on a SLES10_SP1 kernel, it takes
some
>> time for it to step down to a PIO mode before the DVD can be mounted.
>> Oh well.
>
>Yeah, there has been quite some update in libata between SLES10_SP1 and
>2.6.24-rc1.  The controller being ahci, I wonder whether this is caused
>by the different in check_atapi_dma().
>
>1. Does other optical drives have the same problem?  If not, please
post
>the result of "hdparm -I /dev/sr0" with the problematic one attached.
>
>2. If you apply the attached patch to 2.6.24-rc1, does it behave the
>same as the SLES10SP1 kernel?
>
>--
>Tejun

All of the ATAPI drives seem to have the issue of taking a while to slow
down and start working.  I will try the patch and see what happens.  I
will also get the hdparm info from all of the drives I am using to see
if something stands out.

Thanks,

Jason
 
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