RE: [PATCH] libata-pmp: add schedule timeout to support some PMP cards

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Thanks and Best Regards
Jerry Huang


>-----Original Message-----
>From: Mark Lord [mailto:kernel@xxxxxxxxxxxx]
>Sent: Wednesday, November 16, 2011 12:04 AM
>To: Tejun Heo
>Cc: Huang Changming-R66093; linux-ide@xxxxxxxxxxxxxxx
>Subject: Re: [PATCH] libata-pmp: add schedule timeout to support some
>PMP cards
>
>On 11-11-15 10:24 AM, Mark Lord wrote:
>> On 11-11-15 09:51 AM, Tejun Heo wrote:
>>> Hello,
>>>
>>> On Tue, Nov 15, 2011 at 08:43:02AM +0000, Huang Changming-R66093
>wrote:
>>>> The PMP card we are talking about is JMB393:
>>>> Port Multiplier 1.2, 0x197b:0x0325 r0, 15 ports, feat 0x5/0xf.
>>>>
>>>> This issue is observed on Freescale's Sata controller, including
>p1020e and mpc837xe.
>>>
>>> Can you please try different combinations?  ie. freescale sata +
>>> other PMP and jmb393 + other sata controllers.  We need to know more
>>> before adding workarounds to upstream.  Also, would you mind if I cc
>>> jmicron ppl?
>>
>>
>> I'm late tuning in here, but I have a JMB393 doorstop here and would
>> love to have it actually work with Linux.
>> It fails with all of my sata_sil, sata_sil24 and AHCI (including JMB)
>controllers.
>>
>> What's the patch that I need to test ?
>
>Found it, tried it, still have a Linux doorstop.
>Works fine under that other O/S though.
>
That’s a bad news. I think we need one workaround to fix it.
I tested the other two PMP cards, they work well on Freescale's board:
Port Multiplier 1.1, 0x1095:0x4726 r31, 7 ports, feat 0x1/0x9 (Silicon Image)
Port Multiplier 1.2, 0x197b:0x0321 r0, 5 ports, feat 0x5/0xf (JMB391)
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