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libata: Power off empty ports
Give users the option of completely powering off unoccupied SATA ports using the existing min_power link_power_management_policy option. When the use selects this option on an empty port, we will power the port off by setting DET to off. For occupied ports, behavior is unchanged. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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@ -3619,8 +3619,14 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
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scontrol |= (0x2 << 8);
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break;
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case ATA_LPM_MIN_POWER:
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/* no restrictions on LPM transitions */
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scontrol &= ~(0x3 << 8);
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if (ata_link_nr_enabled(link) > 0)
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/* no restrictions on LPM transitions */
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scontrol &= ~(0x3 << 8);
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else {
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/* empty port, power off */
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scontrol &= ~0xf;
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scontrol |= (0x1 << 2);
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}
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break;
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default:
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WARN_ON(1);
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@ -3423,7 +3423,7 @@ fail:
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return rc;
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}
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static int ata_link_nr_enabled(struct ata_link *link)
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int ata_link_nr_enabled(struct ata_link *link)
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{
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struct ata_device *dev;
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int cnt = 0;
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@ -1151,6 +1151,7 @@ extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
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ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
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ata_postreset_fn_t postreset);
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extern void ata_std_error_handler(struct ata_port *ap);
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extern int ata_link_nr_enabled(struct ata_link *link);
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/*
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* Base operations to inherit from and initializers for sht
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