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[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>
This commit is contained in:
Lin Ming 2012-01-16 13:23:23 +08:00 committed by Jeff Garzik
parent a25a2b8409
commit 966f1212e1
1 changed files with 1 additions and 0 deletions
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1
drivers/ata/libata-transport.c
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@ -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);