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[SCSI] libsas: Add a sysfs knob to enable/disable a phy

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This patch lets a user arbitrarily enable or disable a phy via sysfs.
Potential applications include shutting down a phy to replace one
lane of wide port, and (more importantly) providing a method for the
libata SATL to control the phy.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Darrick J. Wong
2007-01-11 14:14:57 -08:00
committed by James Bottomley
parent b218a0d8e2
commit acbf167d4a
5 changed files with 90 additions and 2 deletions
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drivers/scsi/libsas/sas_scsi_host.c
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@@ -875,3 +875,4 @@ EXPORT_SYMBOL_GPL(sas_change_queue_type);
EXPORT_SYMBOL_GPL(sas_bios_param);
EXPORT_SYMBOL_GPL(sas_task_abort);
EXPORT_SYMBOL_GPL(sas_phy_reset);
EXPORT_SYMBOL_GPL(sas_phy_enable);