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authorLin Ming <ming.m.lin@intel.com>2012-01-16 13:23:23 +0800
committerJeff Garzik <jgarzik@redhat.com>2012-01-17 20:48:06 -0500
commit966f1212e1ac5fe3ddf04479d21488ddb36a2608 (patch)
tree86054a1642889b9904faa704504bd098834e91ed
parenta25a2b84098eb5e001cb8086603d692aa95bf2ec (diff)
downloadvexpress-lsk-966f1212e1ac5fe3ddf04479d21488ddb36a2608.tar.gz
[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>
-rw-r--r--drivers/ata/libata-transport.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 9a7f0ea565d..74aaee30e26 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);