[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>
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a25a2b84
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