From 65fe1f0f66a57380229a4ced844188103135f37b Mon Sep 17 00:00:00 2001 From: Shane Huang Date: Fri, 7 Sep 2012 22:40:01 +0800 Subject: ahci: implement aggressive SATA device sleep support Device Sleep is a feature as described in AHCI 1.3.1 Technical Proposal. This feature enables an HBA and SATA storage device to enter the DevSleep interface state, enabling lower power SATA-based systems. Aggressive Device Sleep enables the HBA to assert the DEVSLP signal as soon as there are no commands outstanding to the device and the port specific Device Sleep idle timer has expired. This enables autonomous entry into the DevSleep interface state without waiting for software in power sensitive systems. This patch enables Aggressive Device Sleep only if both host controller and device support it. Tested on AMD reference board together with Device Sleep supported device sample. Signed-off-by: Shane Huang Reviewed-by: Aaron Lu Signed-off-by: Jeff Garzik --- include/linux/libata.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/libata.h') diff --git a/include/linux/libata.h b/include/linux/libata.h index 64f90e17e51..464e67c2e77 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -162,6 +162,7 @@ enum { ATA_DFLAG_DETACHED = (1 << 25), ATA_DFLAG_DA = (1 << 26), /* device supports Device Attention */ + ATA_DFLAG_DEVSLP = (1 << 27), /* device supports Device Sleep */ ATA_DEV_UNKNOWN = 0, /* unknown device */ ATA_DEV_ATA = 1, /* ATA device */ @@ -649,6 +650,9 @@ struct ata_device { u32 gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */ }; + /* Identify Device Data Log (30h), SATA Settings (page 08h) */ + u8 sata_settings[ATA_SECT_SIZE]; + /* error history */ int spdn_cnt; /* ering is CLEAR_END, read comment above CLEAR_END */ -- cgit v1.2.3-70-g09d2