v3: ahci: imx: setup power saving methods
 - Thanks for Tejun's suggestions.
 override the error_handler by ahci_imx_error_handler, to do
 the complete SATA device detection, enter into PDDQ mode,
 if there is no any SATA device.

 - minor modifications:
   - The format of the copyright is changed, because that the
   original one can't pass fsl internal patch reivew without
   the character '(c)'.
   - Change the module parameters to be more readable.

V2: http://www.spinics.net/lists/linux-ide/msg46606.html
 - kernel build option is replaced by the module parameter(ahci-imx.hp) 

v1: http://www.spinics.net/lists/linux-ide/msg46389.html
 * Disable sata phy internal pll reference clock when
 sysetem enter into suspend mode, enable it after resume.
 * Enter into test power down mode when there is no sata disk
 detected on the port and 'AHCI_IMX_PHY_POWER_DOWN_MODE' is
 enabled.

This patch is based on for-next branch of
"http://git.kernel.org/pub/scm/linux/kernel/git/tj/libata.git"


[v3] ahci: imx: setup power saving methods
drivers/ata/ahci_imx.c |  125 +++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 123 insertions(+), 2 deletions(-)