From: Lin Ming Date: Mon, 16 Jan 2012 05:23:23 +0000 (+0800) Subject: [libata] enable ata port async suspend X-Git-Tag: v3.3-rc1~20^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=966f1212e1ac5fe3ddf04479d21488ddb36a2608;p=platform%2Fkernel%2Flinux-3.10.git [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 Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c index 9a7f0ea..74aaee3 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);