From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Al Stone <al.stone@linaro.org>
Cc: "Zheng, Lv" <lv.zheng@intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Olof Johansson <olof@lixom.net>,
Rob Herring <robherring2@gmail.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
Linaro Patches <patches@linaro.org>,
"linaro-kernel@lists.linaro.org" <linaro-kernel@lists.linaro.org>,
"linaro-acpi@lists.linaro.org" <linaro-acpi@lists.linaro.org>
Subject: Re: [PATCH v2 4/6] ACPI: ARM: exclude DMI calls
Date: Mon, 25 Nov 2013 17:45:52 +0000 [thread overview]
Message-ID: <20131125174552.GA7417@srcf.ucam.org> (raw)
In-Reply-To: <52938C3F.20905@linaro.org>
On Mon, Nov 25, 2013 at 10:43:27AM -0700, Al Stone wrote:
> On 11/25/2013 08:30 AM, Matthew Garrett wrote:
> >Is ACPI_REDUCED_HARDWARE supposed to indicate support for the reduced
> >hardware profile, or that the platform *only* implements the reduced
> >hardware profile?
>
> From what I can see in ACPICA, ACPI_REDUCED_HARDWARE indicates the
> platform *only* implements the reduced hardware profile. This *seems*
> to be consistent with the specification -- see 3.11.1, second bullet,
> for example:
Ok, so a kernel built without ACPI_REDUCED_HARDWARE would still support
the reduced hardware profile?
> ...if by "not supported" one takes that to mean "does not exist when
> compiled." I can look at the ACPICA code again, just the same; perhaps
> there is some reasonable way to at least select one or the other at boot
> as the first step, and then allow switching between modes as a later
> step.
I don't think you'd ever want to switch after init time. There's a flag
in the FADT that indicates whether a system is implementing the reduced
hardware profile or not.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2013-11-25 17:46 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-22 0:41 [PATCH v2 0/6] Hardware Reduced Mode cleanup for ACPI al.stone
[not found] ` < 528F9C65.7010302@linaro.org>
[not found] ` < CAOesGMgFBRjO++JSP0ddKKQ2RfG8V4fb97Hd+Oqwixi_Tt7Qwg@mail.gmail.com>
2013-11-22 0:41 ` [PATCH v2 1/6] ACPI: introduce CONFIG_ACPI_REDUCED_HARDWARE to enable this ACPI mode al.stone
2013-11-22 0:41 ` [PATCH v2 2/6] ACPI: bus master reload not supported in reduced HW mode al.stone
2013-11-22 3:06 ` Hanjun Guo
2013-11-27 22:35 ` Al Stone
2013-11-22 0:41 ` [PATCH v2 3/6] ACPI: HW reduced mode does not allow use of the FADT sci_interrupt field al.stone
2013-11-22 0:41 ` [PATCH v2 4/6] ACPI: ARM: exclude DMI calls al.stone
2013-11-22 13:25 ` Rob Herring
2013-11-22 18:03 ` Al Stone
2013-11-22 18:53 ` Olof Johansson
2013-11-22 23:15 ` Rafael J. Wysocki
2013-11-23 0:05 ` Al Stone
2013-11-23 16:38 ` Matthew Garrett
2013-11-25 5:10 ` Zheng, Lv
2013-11-25 15:30 ` Matthew Garrett
2013-11-25 17:43 ` Al Stone
2013-11-25 17:45 ` Matthew Garrett [this message]
2013-11-25 18:01 ` Al Stone
2013-12-04 1:30 ` Al Stone
2013-12-04 1:34 ` Matthew Garrett
2013-12-10 12:45 ` Grant Likely
2013-11-22 0:41 ` [PATCH v2 5/6] ACPI: do not reserve memory regions for some FADT entries in HW reduced mode al.stone
2013-11-22 0:41 ` [PATCH v2 6/6] ACPI: in HW reduced mode, using FADT PM information is not allowed al.stone
2013-11-22 23:18 ` [PATCH v2 0/6] Hardware Reduced Mode cleanup for ACPI Rafael J. Wysocki
2013-11-22 23:33 ` Al Stone
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