path: root/include
diff options
authorMark Lord <liml@rtr.ca>2007-04-17 18:26:07 -0400
committerJeff Garzik <jeff@garzik.org>2007-04-28 14:40:40 -0400
commit169439c2e35f01e7832a9b4fc8a7446980c3d593 (patch)
tree83cbc6898be74b2bfb49bd4eaa966913c49de9da /include
parentlibata: HPA support (diff)
libata: Handle drives that require a spin-up command before first access
(S)ATA drives can be configured for "power-up in standby", a mode whereby a specific "spin up now!" command is required before the first media access. Currently, a drive with this feature enabled can not be used at all with libata, and once in this mode, the drive becomes a doorstop. The older drivers/ide subsystem at least enumerates the drive, so that it can be woken up after the fact from a userspace HDIO_* command, but not libata. This patch adds support to libata for the "power-up in standby" mode where a "spin up now!" command (SET_FEATURES) is needed. With this, libata will recognize such drives, spin them up, and then re-IDENTIFY them if necessary to get a full/complete set of drive features data. Drives in this state are determined by looking for special values in id[2], as documented in the current ATA specs. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'include')
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ata.h b/include/linux/ata.h
index f4dc8dfeadc2..edb31bfff68f 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -202,6 +202,8 @@ enum {
SETFEATURES_WC_ON = 0x02, /* Enable write cache */
SETFEATURES_WC_OFF = 0x82, /* Disable write cache */
+ SETFEATURES_SPINUP = 0x07, /* Spin-up drive */
/* ATAPI stuff */
ATAPI_PKT_DMA = (1 << 0),
ATAPI_DMADIR = (1 << 2), /* ATAPI data dir: