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path: root/drivers/ata/libata-sata.c
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Diffstat (limited to 'drivers/ata/libata-sata.c')
-rw-r--r--drivers/ata/libata-sata.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/ata/libata-sata.c b/drivers/ata/libata-sata.c
index 5d31c08be013..a701e1538482 100644
--- a/drivers/ata/libata-sata.c
+++ b/drivers/ata/libata-sata.c
@@ -396,10 +396,23 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
case ATA_LPM_MED_POWER_WITH_DIPM:
case ATA_LPM_MIN_POWER_WITH_PARTIAL:
case ATA_LPM_MIN_POWER:
- if (ata_link_nr_enabled(link) > 0)
- /* no restrictions on LPM transitions */
+ if (ata_link_nr_enabled(link) > 0) {
+ /* assume no restrictions on LPM transitions */
scontrol &= ~(0x7 << 8);
- else {
+
+ /*
+ * If the controller does not support partial, slumber,
+ * or devsleep, then disallow these transitions.
+ */
+ if (link->ap->host->flags & ATA_HOST_NO_PART)
+ scontrol |= (0x1 << 8);
+
+ if (link->ap->host->flags & ATA_HOST_NO_SSC)
+ scontrol |= (0x2 << 8);
+
+ if (link->ap->host->flags & ATA_HOST_NO_DEVSLP)
+ scontrol |= (0x4 << 8);
+ } else {
/* empty port, power off */
scontrol &= ~0xf;
scontrol |= (0x1 << 2);