ahci: imx: setup power saving methods
In order to save power consumption as much as possible.
* Disable sata phy internal pll reference clock when sysetem enter
into suspend mode, enable it after resume.
* Setup module parameter used to enable imx ahci test power down
mode(PDDQ) or not, when there is no device detected on the port
* 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)'.
- Exports ahci_platform_ops and ahci_error_handler().
NOTE:
* The hot-plug can't be supported when PDDQ mode is ever enabled.
* module parameter usage how-to:
- default: enable PDDQ mode when no device detected.
- add "ahci-imx.hotplug=1" into kernel command line if your don't
want to enable PDDQ mode when no device detected on the port.
tj: Slightly updated description and comments.
Signed-off-by: Richard Zhu <r65037@freescale.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 2daaee0..7708ca7 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -49,10 +49,11 @@
};
MODULE_DEVICE_TABLE(platform, ahci_devtype);
-static struct ata_port_operations ahci_platform_ops = {
+struct ata_port_operations ahci_platform_ops = {
.inherits = &ahci_ops,
.host_stop = ahci_host_stop,
};
+EXPORT_SYMBOL_GPL(ahci_platform_ops);
static struct ata_port_operations ahci_platform_retry_srst_ops = {
.inherits = &ahci_pmp_retry_srst_ops,