On Sat, May 17, 2014 at 9:46 AM, Shawn Guo [off-list ref] wrote:

The commit e783c51 (ahci: imx: software workaround for phy reset issue
in resume) calls imx_sata_phy_reset() to reset phy immediately after
SATA MPLL is enabled.  It seems working fine mostly, but fails in some
case as below.

...
ahci-imx 2200000.sata: failed to reset phy: -110
ahci-imx: probe of 2200000.sata failed with error -110

After talking to the designer, we learnt that when enabling i.MX6Q SATA
MPLL, we need to wait 100us for it to settle down for safety.  Add this
required delay to fix above failure.

Signed-off-by: Shawn Guo <redacted>

On my sabresd board that was not connected to any sata disk I was
always getting the 'failed to reset phy' error.

With this patch the error goes away and the driver probes successfully.

Tested-by: Fabio Estevam <redacted>