From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752604AbeDORRv (ORCPT ); Sun, 15 Apr 2018 13:17:51 -0400 Received: from mail-wr0-f176.google.com ([209.85.128.176]:33579 "EHLO mail-wr0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752460AbeDORRt (ORCPT ); Sun, 15 Apr 2018 13:17:49 -0400 X-Google-Smtp-Source: AIpwx4+WfITXuaYu/boH7PTS5k+fWQ6rfqGBUjzJE28VZZjI2jd4I7sKR0VQlWIcYMVdPOnpaPIDMw== Date: Sun, 15 Apr 2018 19:17:46 +0200 From: Pali =?utf-8?B?Um9ow6Fy?= To: Lukas Wunner Cc: Kai-Heng Feng , Takashi Iwai , mario.limonciello@dell.com, andy@infradead.org, dvhart@infradead.org, mjg59@srcf.ucam.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: Re: [PATCH v3 3/3] ALSA: hda: Disabled unused audio controller for Dell platforms with Switchable Graphics Message-ID: <20180415171746.futkvgbaoj6quy5z@pali> References: <20180412104239.25584-1-kai.heng.feng@canonical.com> <20180412104239.25584-3-kai.heng.feng@canonical.com> <20180412105909.tbyfcjm55sb47hiq@pali> <93DC0F40-81A5-49C6-A470-0D1B6AA85725@canonical.com> <20180414104512.GA27158@wunner.de> <20180414104950.ngomyjy5l5cwhb5i@pali> <20180414111711.GA4245@wunner.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="lsvnox7sxk76vpiz" Content-Disposition: inline In-Reply-To: <20180414111711.GA4245@wunner.de> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --lsvnox7sxk76vpiz Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Saturday 14 April 2018 13:17:11 Lukas Wunner wrote: > On Sat, Apr 14, 2018 at 12:49:50PM +0200, Pali Roh=C3=A1r wrote: > > On Saturday 14 April 2018 12:45:12 Lukas Wunner wrote: > > > On Thu, Apr 12, 2018 at 10:15:41PM +0800, Kai-Heng Feng wrote: > > > > Do you have any suggestion to check if it connects to the system via > > > > Thunderbolt? > > >=20 > > > Just use pci_is_thunderbolt_attached(), introduced by 8531e283bee6, > > > like this: > > >=20 > > > if (check_dell_switchable_gfx(pci) && !pci_is_thunderbolt_attached(pc= i)) > >=20 > > And what about PCI-e device attached to ExpressCard slot? >=20 > I don't know of a bullet-proof way to recognize those. In theory > one could check if the PCIe port above the GPU is a non-hotplug > root port, but I think there are machines with hotplug capable > root ports with GPUs below them that aren't actually removable. >=20 > However I think ExpressCard-attached GPUs were rare, much less ones > with integrated HDA controller, so in reality that's probably a > non-issue. Hm... maybe another idea: Is it possible to detect which audio pci device belongs to graphics card via vga_switcheroo? Currently, looking at output it is same PCI device as graphic card, just different PCI function. --=20 Pali Roh=C3=A1r pali.rohar@gmail.com --lsvnox7sxk76vpiz Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABECAB0WIQS4VrIQdKium2krgIWL8Mk9A+RDUgUCWtOJOAAKCRCL8Mk9A+RD UuYYAJ9Lpy9Pz9bUaG+MA2favSZebY/RQACfTgw6dpp4U+1FXTlc++IA8aitEX0= =vVLS -----END PGP SIGNATURE----- --lsvnox7sxk76vpiz--