Re: [PATCH v2 0/3] ahci: fix boot/resume COMRESET failures

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On Sun, Mar 4, 2012 at 6:58 PM, Lin Ming <ming.m.lin@xxxxxxxxx> wrote:
> On Fri, Mar 2, 2012 at 9:16 PM, cwillu <cwillu@xxxxxxxxxx> wrote:
>> On Tue, Feb 21, 2012 at 12:38 PM, Brian Norris
>> <computersforpeace@xxxxxxxxx> wrote:
>>> This series addresses regression problems with
>>>
>>>    commit 7faa33da9b7add01db9f1ad92c6a5d9145e940a7
>>>    ahci: start engine only during soft/hard resets
>>
>> I just spent the better part of last night tracking down the specific
>> sources of the log entry I get when I disconnect my e-sata drive; once
>> it disconnects, the port is dead until I reboot; no combination of
>> anything I've been able to poke at in /sys or elsewhere gets it live
>> again.  This starts with 3.3rc1, and turns out to still work fine in
>> 3.2.1. Any chance it's related?
>>
>> 3.3rc5, immediately after the unplug:
>
> Hi,
>
> I tested on my machine and it's fixed by below patch.
> http://marc.info/?l=linux-kernel&m=132996405028746&w=2
>
> Would you please also try it?

Building it now, and will be able to test in about 5 hours.

After looking at the thread, I spent another couple hours on poking
/sys, and did get the port to come back up and find the drive with the
following:

echo on > /sys/devices/pci0000:00/0000:00:1f.2/ata5/power/control
echo on > /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/power/control
echo '- - -' > /sys/devices/pci0000:00/0000:00:1f.2/ata5/host4/scsi_host/host4/scan
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