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authorShane Huang <shane.huang@amd.com>2012-09-07 22:40:01 +0800
committerJeff Garzik <jgarzik@redhat.com>2012-09-13 01:08:53 -0400
commit65fe1f0f66a57380229a4ced844188103135f37b (patch)
treeeb96e6c8de3bf8c4697618c8ee1dce4bd6d6a9ea /include/linux/ata.h
parent583661a89ed2e484bd295e7b4606099340478c38 (diff)
downloadlinux-linaro-stable-65fe1f0f66a57380229a4ced844188103135f37b.tar.gz
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 <shane.huang@amd.com> Reviewed-by: Aaron Lu <aaron.lwe@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'include/linux/ata.h')
-rw-r--r--include/linux/ata.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 47a9dbf02159..408da9502177 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -295,6 +295,13 @@ enum {
/* READ_LOG_EXT pages */
ATA_LOG_SATA_NCQ = 0x10,
+ ATA_LOG_SATA_ID_DEV_DATA = 0x30,
+ ATA_LOG_SATA_SETTINGS = 0x08,
+ ATA_LOG_DEVSLP_MDAT = 0x30,
+ ATA_LOG_DEVSLP_MDAT_MASK = 0x1F,
+ ATA_LOG_DEVSLP_DETO = 0x31,
+ ATA_LOG_DEVSLP_VALID = 0x37,
+ ATA_LOG_DEVSLP_VALID_MASK = 0x80,
/* READ/WRITE LONG (obsolete) */
ATA_CMD_READ_LONG = 0x22,
@@ -348,6 +355,7 @@ enum {
SATA_FPDMA_IN_ORDER = 0x04, /* FPDMA in-order data delivery */
SATA_AN = 0x05, /* Asynchronous Notification */
SATA_SSP = 0x06, /* Software Settings Preservation */
+ SATA_DEVSLP = 0x09, /* Device Sleep */
/* feature values for SET_MAX */
ATA_SET_MAX_ADDR = 0x00,
@@ -584,6 +592,7 @@ static inline int ata_is_data(u8 prot)
#define ata_id_cdb_intr(id) (((id)[ATA_ID_CONFIG] & 0x60) == 0x20)
#define ata_id_has_da(id) ((id)[ATA_ID_SATA_CAPABILITY_2] & (1 << 4))
+#define ata_id_has_devslp(id) ((id)[ATA_ID_FEATURE_SUPP] & (1 << 8))
static inline bool ata_id_has_hipm(const u16 *id)
{