RE: [PATCH] ata: Add the SW NCQ support to sata_nv for MCP51/MCP55/MCP61

["Peer Chen" <pchen@nvidia.com>]

We did the many test with the new version driver and didn't encounter
that problem, but in certain cases, DMASETUP command packets from drive
to the controller are corrupted, and the controller issues an R_ERR to
the drive. Drives that comply with SATA spec will re-transmit the
corrupted packet and normal operation continues. However, some Maxtor
NCQ drives do not re-transmit the DMASETUP command packet, resulting in
software timeout for this command. So if you are using the Maxtor HD and
meet this problem,please don't enable the NCQ function.


BRs
Peer Chen

-----Original Message-----
From: Robert Hancock [mailto:hancockr@shaw.ca] 
Sent: Wednesday, June 27, 2007 1:07 PM
To: kuan luo
Cc: linux-kernel@vger.kernel.org; jeff@garzik.org;
akpm@linux-foundation.org; Peer Chen; Kuan Luo
Subject: Re: [PATCH] ata: Add the SW NCQ support to sata_nv for
MCP51/MCP55/MCP61

kuan luo wrote:
> Add the Software NCQ support to sata_nv.c for MCP51/MCP55/MCP61 SATA 
> controller.
> NCQ function is disable by default, you can enable it with 'swncq=1'
> 
> Signed-off-by: Kuan Luo <kluo@nvidia.com>
> Signed-off-by: Peer Chen <pchen@nvidia.com>
> 

Haven't reviewed in detail, but does look cleaner than the previous
version. Some people reported seeing some unrecognized FIS, etc. errors
with the previous version, have those been looked into/fixed?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca Home Page:
http://www.roberthancock.com/

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