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| author | Lin Ming <ming.m.lin@intel.com> | 2012-01-16 06:23:23 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2012-01-18 02:48:06 +0100 |
| commit | 966f1212e1ac5fe3ddf04479d21488ddb36a2608 (patch) | |
| tree | 86054a1642889b9904faa704504bd098834e91ed /drivers/ata/libata-transport.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmo... (diff) | |
| download | linux-966f1212e1ac5fe3ddf04479d21488ddb36a2608.tar.xz linux-966f1212e1ac5fe3ddf04479d21488ddb36a2608.zip | |
[libata] enable ata port async suspend
This saves devices suspend/resume time.
Tested system suspend/resume with SATA IDE/AHCI mode 3 times.
Below is the time took for devices suspend/resume.
SATA mode vanilla-kernel patched-kernel
--------- --------------------- ---------------------
IDE suspend: 0.744 suspend: 0.432
(0.716, 0.768, 0.748) (0.440, 0.428, 0.428)
resume: 5.084 resume: 2.209
(5.100, 5.064, 5.088) (2.168, 2.232, 2.228)
AHCI: suspend: 0.725 suspend: 0.449
(0.740, 0.708, 0.728) (0.456, 0.448, 0.444)
resume: 2.556 resume: 1.896
(2.604, 2.492, 2.572) (1.932, 1.872, 1.884)
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/ata/libata-transport.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c index 9a7f0ea565df..74aaee30e264 100644 --- a/drivers/ata/libata-transport.c +++ b/drivers/ata/libata-transport.c @@ -291,6 +291,7 @@ int ata_tport_add(struct device *parent, goto tport_err; } + device_enable_async_suspend(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); |