From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: Re: [PATCH v5 18/18] Documentation: ACPI for ARM64 Date: Mon, 5 Jan 2015 11:05:33 +0000 Message-ID: <20150105110533.GA14967@e104818-lin.cambridge.arm.com> References: <1413553034-20956-1-git-send-email-hanjun.guo@linaro.org> <1413553034-20956-19-git-send-email-hanjun.guo@linaro.org> <20141224171815.GD13399@e104818-lin.cambridge.arm.com> <54A90A4C.60908@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:55184 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752827AbbAELF4 (ORCPT ); Mon, 5 Jan 2015 06:05:56 -0500 Content-Disposition: inline In-Reply-To: <54A90A4C.60908@linaro.org> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Hanjun Guo Cc: "Rafael J. Wysocki" , Mark Rutland , Olof Johansson , "grant.likely@linaro.org" , Will Deacon , "graeme.gregory@linaro.org" , Arnd Bergmann , Sudeep Holla , "jcm@redhat.com" , Jason Cooper , Marc Zyngier , Bjorn Helgaas , Daniel Lezcano , Mark Brown , Rob Herring , Robert Richter , Lv Zheng , Robert Moore , Lorenzo Pieralisi , Liviu Dudau , Randy Dunlap , Charles Garcia-Tobin , Kangkang.Shen@huawe On Sun, Jan 04, 2015 at 09:39:24AM +0000, Hanjun Guo wrote: > On 2014=E5=B9=B412=E6=9C=8825=E6=97=A5 01:18, Catalin Marinas wrote: > [...] > > > > In addition to the above and _DSD requirements/banning, I would als= o add > > some clear statements around: > > > > _OSC: only global/published capabilities are allowed. For > > device-specific _OSC we need a process or maybe we can ban them ent= irely > > and rely on _DSD once we clarify the process. > > > > _OSI: firmware must not check for certain _OSI strings. Here I'm no= t > > sure what we would have to do for ARM Linux. Reporting "Windows" do= es > > not make any sense but not reporting anything can, as Matthew Garre= tt > > pointed out, can be interpreted by firmware as "Linux". In addition= to > > any statements in this document, I suggest you patch > > drivers/acpi/acpica/utosi.c accordingly, maybe report "Linux" for A= RM > > and print a kernel warning so that we notice earlier. > > > > ACPI_OS_NAME: this is globally defined as "Microsoft Windows NT". I= t > > doesn't make much sense in the ARM context. Could we change it to > > "Linux" when CONFIG_ARM64? >=20 > We will work on this both on ASWG and linux ACPI driver side, as Dong > and Charles pointed out, _OSI things can be solved in ACPI spec, when > that is done, we can modify the kernel driver to fix the problems abo= ve. Which driver? What about ACPI_OS_NAME? Would you suggest it is fine to report "Microsoft Windows NT" on an ARM system? That _OS_ not _OSI. --=20 Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html