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authorRichard Zhu <r65037@freescale.com>2013-10-15 10:44:54 +0800
committerTejun Heo <tj@kernel.org>2013-10-15 08:47:00 -0400
commit8b789d89813fae01908ecc825c9dfc0ec90647ad (patch)
treeb14d0e8c5212e85f2d44fc9cde292ec5eb499a3a /drivers/ata/libahci.c
parent89951f2245e5c31d6b74dea1570db716175a74fe (diff)
downloadop-kernel-dev-8b789d89813fae01908ecc825c9dfc0ec90647ad.zip
op-kernel-dev-8b789d89813fae01908ecc825c9dfc0ec90647ad.tar.gz
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>
Diffstat (limited to 'drivers/ata/libahci.c')
-rw-r--r--drivers/ata/libahci.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index b67086f..7e2a1b3 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -89,7 +89,6 @@ static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
static int ahci_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static void ahci_postreset(struct ata_link *link, unsigned int *class);
-static void ahci_error_handler(struct ata_port *ap);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
static void ahci_dev_config(struct ata_device *dev);
#ifdef CONFIG_PM
@@ -1982,7 +1981,7 @@ static void ahci_thaw(struct ata_port *ap)
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
-static void ahci_error_handler(struct ata_port *ap)
+void ahci_error_handler(struct ata_port *ap)
{
if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
/* restart engine */
@@ -1995,6 +1994,7 @@ static void ahci_error_handler(struct ata_port *ap)
if (!ata_dev_enabled(ap->link.device))
ahci_stop_engine(ap);
}
+EXPORT_SYMBOL_GPL(ahci_error_handler);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
{
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