Date: Fri, 20 Feb 2009 23:17:52 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r188877 - head/sys/dev/ata/chipsets Message-ID: <200902202317.n1KNHqmh042109@svn.freebsd.org>
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Author: mav Date: Fri Feb 20 23:17:52 2009 New Revision: 188877 URL: http://svn.freebsd.org/changeset/base/188877 Log: Disable port hardware on detach. First switch it to slumber mode to power-down peer transmitter, then disable completely. Side effect of this is saving about 0.5W of power per detached device. Modified: head/sys/dev/ata/chipsets/ata-ahci.c Modified: head/sys/dev/ata/chipsets/ata-ahci.c ============================================================================== --- head/sys/dev/ata/chipsets/ata-ahci.c Fri Feb 20 23:16:47 2009 (r188876) +++ head/sys/dev/ata/chipsets/ata-ahci.c Fri Feb 20 23:17:52 2009 (r188877) @@ -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);
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