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path: root/drivers/ata/ahci.c
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Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c38
1 files changed, 33 insertions, 5 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index b2b9eba1d214..021ce46e2e57 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -610,7 +610,7 @@ static int marvell_enable = 1;
module_param(marvell_enable, int, 0644);
MODULE_PARM_DESC(marvell_enable, "Marvell SATA via AHCI (1 = enabled)");
-static int mobile_lpm_policy = CONFIG_SATA_MOBILE_LPM_POLICY;
+static int mobile_lpm_policy = -1;
module_param(mobile_lpm_policy, int, 0644);
MODULE_PARM_DESC(mobile_lpm_policy, "Default LPM policy for mobile chipsets");
@@ -1604,6 +1604,37 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
return pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
}
+static void ahci_update_initial_lpm_policy(struct ata_port *ap,
+ struct ahci_host_priv *hpriv)
+{
+ int policy = CONFIG_SATA_MOBILE_LPM_POLICY;
+
+
+ /* Ignore processing for non mobile platforms */
+ if (!(hpriv->flags & AHCI_HFLAG_IS_MOBILE))
+ return;
+
+ /* user modified policy via module param */
+ if (mobile_lpm_policy != -1) {
+ policy = mobile_lpm_policy;
+ goto update_policy;
+ }
+
+#ifdef CONFIG_ACPI
+ if (policy > ATA_LPM_MED_POWER &&
+ (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) {
+ if (hpriv->cap & HOST_CAP_PART)
+ policy = ATA_LPM_MIN_POWER_WITH_PARTIAL;
+ else if (hpriv->cap & HOST_CAP_SSC)
+ policy = ATA_LPM_MIN_POWER;
+ }
+#endif
+
+update_policy:
+ if (policy >= ATA_LPM_UNKNOWN && policy <= ATA_LPM_MIN_POWER)
+ ap->target_lpm_policy = policy;
+}
+
static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
unsigned int board_id = ent->driver_data;
@@ -1807,10 +1838,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;
- if ((hpriv->flags & AHCI_HFLAG_IS_MOBILE) &&
- mobile_lpm_policy >= ATA_LPM_UNKNOWN &&
- mobile_lpm_policy <= ATA_LPM_MIN_POWER)
- ap->target_lpm_policy = mobile_lpm_policy;
+ ahci_update_initial_lpm_policy(ap, hpriv);
/* disabled/not-implemented port */
if (!(hpriv->port_map & (1 << i)))