On Thu, May 26, 2011 at 9:12 AM, Andrew Lutomirski [off-list ref] wrote:

On Wed, May 25, 2011 at 5:36 AM, Tejun Heo [off-list ref] wrote:

quoted

Cc'ing Intel people and Jeff.  Hi!

Any ideas what's going on with the following?  In short, on sandy
bridge ahci + intel g2 ssd, doing HOST_RESET during initialization
makes the first reset timeout inducing 10 sec delay.

On my desktop box, I have three SATA devices: a Sandforce-based SSD, a
normal hard drive, and a CD.  Only the SSD has the problem, and
libahci.skip_host_reset=1 fixes it on this box as well.  Here's the
relevant bit of the log:

[    7.431907] ata1: link is slow to respond, please be patient (ready=0)
[   12.121178] ata1: COMRESET failed (errno=-16)
[   12.428010] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   12.540828] ata1.00: ATA-9: OCZ-VERTEX3, 2.02, max UDMA/133

*sigh*

I assumed the fact that I had this problem on two similar motherboard
chipsets with two different generations of disks from two vendors
meant it was a chipset or driver bug.  I assumed wrong.

It was separate firmware bugs in the Sandforce and the Intel firmware.
 Both are fixed in newer versions.

Sorry for the noise,
Andy