Date: Thu, 18 Nov 2004 09:13:32 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: nate@root.org Cc: freebsd-current@freebsd.org Subject: Re: [PATCH] Please test: new ACPI release (20041105) import Message-ID: <20041118.091332.71089191.imp@bsdimp.com> In-Reply-To: <419C3AC2.5010505@root.org> References: <419C1A7A.6050000@root.org> <20041117.204804.71148446.imp@harmony.village.org> <419C3AC2.5010505@root.org>
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In message: <419C3AC2.5010505@root.org>
Nate Lawson <nate@root.org> writes:
: Warner Losh wrote:
: >>My serial port. It's named UART in the AML, that's all. Setting it to
: >>D3 hangs the system.
: >
: > Is it a PCI device too? If not, then maybe you need to disable
: > interrupts in the UART before setting the power state. Chances are
: > its interrupt cause register is returning 0xff, which hangs sio, since
: > it never breaks out of the loop when this happens.
:
: It is not, it's a legacy device:
: sio0 pnpinfo _HID=PNP0501 _UID=0 at handle=\_SB_.PCI0.LPC_.UART
:
: The power methods for it are:
: Method (_PS0, 0, NotSerialized)
: {
: Store (0x03, LDN)
: Store (0x01, LDA)
: Store (0x01, SSBY)
: }
:
: Method (_PS3, 0, NotSerialized)
: {
: Store (0x03, LDN)
: Store (0x00, LDA)
: Store (0x00, SSBY)
: }
:
: The regions accessed by these Store ops are as follows, and all appear
: to be mapped to the ICH:
: OperationRegion (IMGA, SystemIO, 0x15E0, 0x10)
: OperationRegion (NCFG, SystemIO, 0x2E, 0x02)
:
: Is there a standard for how to do power transitions for non-PCI devices?
: I thought you just call the acpi methods if present.
There might be some driver stuff that will need to be done on top of
the calling these things. I don't know what the behavior of the
device is, but many pci devices read 0xffffffff when in d3 mode.
Warner
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