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Code Issues Releases Activity

Disable port hardware on detach. First switch it to slumber mode to

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power-down peer transmitter, then disable completely.
Side effect of this is saving about 0.5W of power per detached device.
This commit is contained in:
Alexander Motin 2009-02-20 23:17:52 +00:00
parent aa68c24fb7
commit 3f9a1dcaeb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=188877
1 changed files with 16 additions and 0 deletions
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16
sys/dev/ata/chipsets/ata-ahci.c
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@ -230,6 +230,22 @@ ata_ahci_ch_attach(device_t dev)
int
ata_ahci_ch_detach(device_t dev)
{
struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
struct ata_channel *ch = device_get_softc(dev);
int offset = ch->unit << 7;
/* Disable port interrupts. */
ATA_OUTL(ctlr->r_res2, ATA_AHCI_P_IE + offset, 0);
/* Reset command register. */
ATA_OUTL(ctlr->r_res2, ATA_AHCI_P_CMD + offset, 0);
/* Allow everything including partial and slumber modes. */
ATA_IDX_OUTL(ch, ATA_SCONTROL, 0);
/* Request slumber mode transition and give some time to get there. */
ATA_OUTL(ctlr->r_res2, ATA_AHCI_P_CMD + offset, ATA_AHCI_P_CMD_SLUMBER);
DELAY(100);
/* Disable PHY. */
ATA_IDX_OUTL(ch, ATA_SCONTROL, ATA_SC_DET_DISABLE);
ata_dmafini(dev);
return (0);