Re: cached PCS

[Tejun Heo <htejun@gmail.com>]

Jeff Garzik wrote:
> Tejun Heo wrote:
>> Jeff Garzik wrote:
>>> Tejun Heo wrote:
>>>> Jeff Garzik wrote:
>>>>> can you resurrect your cached PCS patch?
>>>>>
>>>>> 2.6.18-rc didn't fix the ghost device and long boot delay problems 
>>>>> for everybody.
>>>>
>>>> The cached PCS patch was to fix device detection failure on some 
>>>> ICH5s where PCS is cleared while probing the first port.  Remaining 
>>>> ghost device and long boot delay are fixed by honor-PCS patch.  Do 
>>>> you want me to resurrect both?
>>>
>>> hrm.  Maybe just honor-PCS?
>>
>> Yeap, we need to verify whether the less-jealous-PCS-update patch 
>> cured the ICH5 problem.
> 
> If you are talking about the patch currently in 2.6.18-rc, I got several 
> ACKs that it fixed their problems.
> 
> But OTOH, there was also
> http://marc.theaimsgroup.com/?t=115346292700002&r=1&w=2

I was talking about bugzilla bug #6724.

http://bugzilla.kernel.org/show_bug.cgi?id=6724

It was a weird case of ICH5 clearing PCS present bits while the first 
port is being probed.  The clearing happens during actual probe, that 
is, the bits look okay till the end of the first prereset() but on entry 
to prereset() for the second port, enabled bits are gone.  IIRC, 
bug#6724 is different from all other reports.

I asked the reporter to test 2.6.18-rc4 and see whether the problem is 
gone with new PCS handling.  I'm a bit skeptical about the result.  If 
the problem remains with 2.6.18-rc4, we'll need that cached PCS to solve 
that particular case.

BTW, do you know what Keith Owen's chipset was?

Thanks.

-- 
tejun