Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 15 Nov 2018 21:00:54 +0200
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc:     Lukas Wunner <lukas@wunner.de>, iommu@lists.linux-foundation.org,
        Joerg Roedel <joro@8bytes.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Ashok Raj <ashok.raj@intel.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Jacob jun Pan <jacob.jun.pan@intel.com>,
        Andreas Noever <andreas.noever@gmail.com>,
        Michael Jamet <michael.jamet@intel.com>,
        Yehezkel Bernat <YehezkelShB@gmail.com>,
        Christian Kellner <ckellner@redhat.com>,
        Mario.Limonciello@dell.com,
        Anthony Wong <anthony.wong@canonical.com>,
        linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] PCI / ACPI: Identify external PCI devices
Message-ID: <20181115190054.GD4179@lahna.fi.intel.com>
References: <20181112180203.lx72gjfplb6xlur7@wunner.de>
 <20181113105636.GB11202@e107981-ln.cambridge.arm.com>
 <20181113112700.GT2500@lahna.fi.intel.com>
 <20181113114527.GA12821@e107981-ln.cambridge.arm.com>
 <20181115102239.GU2500@lahna.fi.intel.com>
 <20181115111356.GA599@e107981-ln.cambridge.arm.com>
 <20181115113737.GW2500@lahna.fi.intel.com>
 <20181115120736.pscly6zwd3k2tvd2@wunner.de>
 <20181115121627.GA2500@lahna.fi.intel.com>
 <20181115174608.GA17691@e107981-ln.cambridge.arm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20181115174608.GA17691@e107981-ln.cambridge.arm.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Nov 15, 2018 at 05:46:08PM +0000, Lorenzo Pieralisi wrote:
> Do you really need to parse it if the dev->is_thunderbolt check is enough ?

Yes, we need to parse it one way or another. dev->is_thunderbolt is
based on heuristics which do not apply anymore when the thing gets
integrated in the SoC.

The _DSD is there already (on existing systems) and is being used by
Windows so I don't understand why we cannot take advantage of it? Every
new system with Thunderbolt ports will have it.