Date: Thu, 1 Mar 2012 20:36:50 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r232363 - head/share/man/man9 Message-ID: <201203012036.q21KaoHQ095529@svn.freebsd.org>
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Author: jhb Date: Thu Mar 1 20:36:50 2012 New Revision: 232363 URL: http://svn.freebsd.org/changeset/base/232363 Log: Update the documentation on pci_get/set_powerstate(). These methods are not ACPI-specific at all, but deal with PCI power states. Also, pci_set_powerstate() fails with EOPNOTSUPP if a request is made that the underlying device does not support rather than falling back to somehow setting D0. Modified: head/share/man/man9/pci.9 Modified: head/share/man/man9/pci.9 ============================================================================== --- head/share/man/man9/pci.9 Thu Mar 1 20:32:02 2012 (r232362) +++ head/share/man/man9/pci.9 Thu Mar 1 20:36:50 2012 (r232363) @@ -145,13 +145,13 @@ the configuration space. .Pp The .Fn pci_get_powerstate -function returns the current ACPI power state of the device +function returns the current power state of the device .Fa dev . If the device does not support power management capabilities, then the default state of .Dv PCI_POWERSTATE_D0 is returned. -The following power states are defined by ACPI: +The following power states are defined by PCI: .Bl -hang -width ".Dv PCI_POWERSTATE_UNKNOWN" .It Dv PCI_POWERSTATE_D0 State in which device is on and running. @@ -183,15 +183,13 @@ The .Fn pci_set_powerstate function is used to transition the device .Fa dev -to the ACPI power state +to the PCI power state .Fa state . -It checks to see if the device is PCI 2.2 compliant. -If so, it checks the -capabilities pointer to determine which power states the device supports. -If the device does not have power management capabilities, the default state -of -.Dv PCI_POWERSTATE_D0 -is set. +If the device does not support power management capabilities or +it does not support the specific power state +.Fa state , +then the function will fail with +.Er EOPNOTSUPP . .Pp The .Fn pci_save_state
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