From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 689ACC43613 for ; Thu, 20 Jun 2019 09:49:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E8A82083B for ; Thu, 20 Jun 2019 09:49:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726392AbfFTJtl (ORCPT ); Thu, 20 Jun 2019 05:49:41 -0400 Received: from foss.arm.com ([217.140.110.172]:56838 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726175AbfFTJtl (ORCPT ); Thu, 20 Jun 2019 05:49:41 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 151F5360; Thu, 20 Jun 2019 02:49:41 -0700 (PDT) Received: from e121166-lin.cambridge.arm.com (unknown [10.1.196.255]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id EAA403F246; Thu, 20 Jun 2019 02:49:39 -0700 (PDT) Date: Thu, 20 Jun 2019 10:49:37 +0100 From: Lorenzo Pieralisi To: Lee Jones Cc: Sudeep Holla , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, leif.lindholm@linaro.org Subject: Re: [RFC PATCH] acpi/arm64: ignore 5.1 FADTs that are reported as 5.0 Message-ID: <20190620094937.GB20872@e121166-lin.cambridge.arm.com> References: <20190619121831.7614-1-ard.biesheuvel@linaro.org> <20190619122434.GA25656@e107155-lin> <20190620075732.GB4699@dell> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190620075732.GB4699@dell> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On Thu, Jun 20, 2019 at 08:57:32AM +0100, Lee Jones wrote: > On Wed, 19 Jun 2019, Sudeep Holla wrote: > > > On Wed, Jun 19, 2019 at 02:18:31PM +0200, Ard Biesheuvel wrote: > > > Some Qualcomm Snapdragon based laptops built to run Microsoft Windows > > > are clearly ACPI 5.1 based, given that that is the first ACPI revision > > > that supports ARM, and introduced the FADT 'arm_boot_flags' field, > > > which has a non-zero field on those systems. > > > > > > So in these cases, infer from the ARM boot flags that the FADT must be > > > 5.1 or later, and treat it as 5.1. > > > > > > > Makes sense and looks simple to me. > > > > Acked-by: Sudeep Holla > > Could we pleeeeease have this in for v5.3? > > We have available, consumer-level platforms that rely on this change. But we do not have the kernel infrastructure to support them so I am fine with it but urgency is questionable as far as I am concerned. Lorenzo