diff options
author | Mark Lord <liml@rtr.ca> | 2007-04-17 18:26:07 -0400 |
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committer | Jeff Garzik <jeff@garzik.org> | 2007-04-28 14:40:40 -0400 |
commit | 169439c2e35f01e7832a9b4fc8a7446980c3d593 (patch) | |
tree | 83cbc6898be74b2bfb49bd4eaa966913c49de9da /kernel/rtmutex-debug.c | |
parent | 1e999736cafdffc374f22eed37b291129ef82e4e (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 'kernel/rtmutex-debug.c')
0 files changed, 0 insertions, 0 deletions