diff options
Diffstat (limited to 'drivers/ata/libata-eh.c')
| -rw-r--r-- | drivers/ata/libata-eh.c | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index b990c1ee0b12..c11d8e634bf7 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -3432,7 +3432,7 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, struct ata_eh_context *ehc = &link->eh_context; struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL; enum ata_lpm_policy old_policy = link->lpm_policy; - bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM; + bool host_has_dipm = !(link->ap->flags & ATA_FLAG_NO_DIPM); unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM; unsigned int err_mask; int rc; @@ -3443,28 +3443,35 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, return 0; /* - * DIPM is enabled only for MIN_POWER as some devices - * misbehave when the host NACKs transition to SLUMBER. Order - * device and link configurations such that the host always - * allows DIPM requests. + * This function currently assumes that it will never be supplied policy + * ATA_LPM_UNKNOWN. + */ + if (WARN_ON_ONCE(policy == ATA_LPM_UNKNOWN)) + return 0; + + /* + * DIPM is enabled only for ATA_LPM_MIN_POWER, + * ATA_LPM_MIN_POWER_WITH_PARTIAL, and ATA_LPM_MED_POWER_WITH_DIPM, as + * some devices misbehave when the host NACKs transition to SLUMBER. */ ata_for_each_dev(dev, link, ENABLED) { - bool hipm = ata_id_has_hipm(dev->id); - bool dipm = ata_id_has_dipm(dev->id) && !no_dipm; + bool dev_has_hipm = ata_id_has_hipm(dev->id); + bool dev_has_dipm = ata_id_has_dipm(dev->id); /* find the first enabled and LPM enabled devices */ if (!link_dev) link_dev = dev; - if (!lpm_dev && (hipm || dipm)) + if (!lpm_dev && + (dev_has_hipm || (dev_has_dipm && host_has_dipm))) lpm_dev = dev; hints &= ~ATA_LPM_EMPTY; - if (!hipm) + if (!dev_has_hipm) hints &= ~ATA_LPM_HIPM; /* disable DIPM before changing link config */ - if (policy < ATA_LPM_MED_POWER_WITH_DIPM && dipm) { + if (dev_has_dipm) { err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_DISABLE, SATA_DIPM); if (err_mask && err_mask != AC_ERR_DEV) { @@ -3505,10 +3512,16 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, if (ap && ap->slave_link) ap->slave_link->lpm_policy = policy; - /* host config updated, enable DIPM if transitioning to MIN_POWER */ + /* + * Host config updated, enable DIPM if transitioning to + * ATA_LPM_MIN_POWER, ATA_LPM_MIN_POWER_WITH_PARTIAL, or + * ATA_LPM_MED_POWER_WITH_DIPM. + */ ata_for_each_dev(dev, link, ENABLED) { - if (policy >= ATA_LPM_MED_POWER_WITH_DIPM && !no_dipm && - ata_id_has_dipm(dev->id)) { + bool dev_has_dipm = ata_id_has_dipm(dev->id); + + if (policy >= ATA_LPM_MED_POWER_WITH_DIPM && host_has_dipm && + dev_has_dipm) { err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE, SATA_DIPM); if (err_mask && err_mask != AC_ERR_DEV) { |