* Soft-reset on a FIS-Based-Switching AHCI interface
@ 2011-09-12 14:02 Richard Crewe
2011-09-14 5:04 ` Jeff Garzik
0 siblings, 1 reply; 2+ messages in thread
From: Richard Crewe @ 2011-09-12 14:02 UTC (permalink / raw)
To: linux-ide
The AHCI spec. seems to indicate that a soft-reset can only be performed
if FBS is disabled.
Looking at the LibATA and LibAHCI code at the moment, I can't see where
this is done. The soft-reset happens during error recovery when the port
re-enumerates devices.
Am I missing something or is this a _relatively_ less-well tested area
of the LibATA/AHCI operation?
--
Richard Crewe, Software Engineer
PLX Technology Ltd. Registered in England, company number 2733820
Registered Address: 25 Milton Park, Abingdon, Oxfordshire. UK. OX14 4SH
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Soft-reset on a FIS-Based-Switching AHCI interface
2011-09-12 14:02 Soft-reset on a FIS-Based-Switching AHCI interface Richard Crewe
@ 2011-09-14 5:04 ` Jeff Garzik
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Garzik @ 2011-09-14 5:04 UTC (permalink / raw)
To: Richard Crewe; +Cc: linux-ide, Shane Huang
On 09/12/2011 10:02 AM, Richard Crewe wrote:
> The AHCI spec. seems to indicate that a soft-reset can only be performed
> if FBS is disabled.
Can you cite section numbers / specific references for this?
> Looking at the LibATA and LibAHCI code at the moment, I can't see where
> this is done. The soft-reset happens during error recovery when the port
> re-enumerates devices.
>
> Am I missing something or is this a _relatively_ less-well tested area
> of the LibATA/AHCI operation?
I cannot see where FBS is disabled for soft-reset, either.
FBS is pretty new, hasn't changed much at all since its initial
implementation on an AMD reference board, and is (obviously) only used
with PMPs. FBS is a pretty small subset of the total AHCI population,
so I doubt the code is exercised heavily except for a very few, large
storage installations.
Jeff
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