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| author | Jian Peng <jipeng2005@gmail.com> | 2011-04-22 23:58:10 -0700 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2011-04-24 11:35:40 -0400 |
| commit | 270dac35c26433d06a89150c51e75ca0181ca7e4 (patch) | |
| tree | 187f95b21867318d77b768e1e8be27b0894c239b /include | |
| parent | 792d37af35386466cf5dda51d6b710fa1dd9aad1 (diff) | |
libata: ahci_start_engine compliant to AHCI spec
At the end of section 10.1 of AHCI spec (rev 1.3), it states
Software shall not set PxCMD.ST to 1 until it is determined that
a functoinal device is present on the port as determined by
PxTFD.STS.BSY=0, PxTFD.STS.DRQ=0 and PxSSTS.DET=3h
Even though most AHCI host controller works without this check,
specific controller will fail under this condition.
Signed-off-by: Jian Peng <jipeng2005@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions