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=-12.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 8D3C7C433B4 for ; Sat, 10 Apr 2021 20:48:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F2766105A for ; Sat, 10 Apr 2021 20:48:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234548AbhDJUsg (ORCPT ); Sat, 10 Apr 2021 16:48:36 -0400 Received: from mupuf.org ([167.71.42.210]:41458 "EHLO mupuf.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234439AbhDJUsf (ORCPT ); Sat, 10 Apr 2021 16:48:35 -0400 Received: from [IPv6:2a01:4b00:86b9:100:9ede:1593:85ef:7eda] (unknown [IPv6:2a01:4b00:86b9:100:9ede:1593:85ef:7eda]) by Neelix.spliet.org (Postfix) with ESMTPSA id 03CC4F20011; Sat, 10 Apr 2021 21:48:15 +0100 (BST) DKIM-Filter: OpenDKIM Filter v2.11.0 Neelix.spliet.org 03CC4F20011 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=spliet.org; s=default; t=1618087696; bh=G/KMHNxJ10tQbDe69nA++juz4fZynQZtQ/TmQnU8gZU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=rtcv1a0XHMirOX80HxcGaWbLsoJRj6qdJd3vWIhMsW3jREz5OLGRbkylBUe31GukR KfHjxMcHhGdDpL4mBMubQ+bys/OMe0DzF4R6g6BgrfpZktq2tA/AFgr1s8EkUvOXgO 11vjcgkRFBdspV765d/qjjBXIc5u//qW2yTaT+yI= Subject: Re: [Nouveau] [PATCH v2] ALSA: hda: Continue to probe when codec probe fails To: Lukas Wunner Cc: Karol Herbst , Kai-Heng Feng , "moderated list:SOUND" , Kai Vehmanen , Takashi Iwai , nouveau , Pierre-Louis Bossart , tiwai@suse.com, Alex Deucher , Alan Stern , Mike Rapoport , Linux PCI , Bjorn Helgaas , Jaroslav Kysela , open list , Aaron Plattner References: <20210410192314.GB16240@wunner.de> From: Roy Spliet Message-ID: Date: Sat, 10 Apr 2021 21:48:15 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210410192314.GB16240@wunner.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.103.2 at Neelix X-Virus-Status: Clean Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Op 10-04-2021 om 20:23 schreef Lukas Wunner: > On Sat, Apr 10, 2021 at 04:51:27PM +0100, Roy Spliet wrote: >> Can I ask someone with more >> technical knowledge of snd_hda_intel and vgaswitcheroo to brainstorm about >> the possible challenges of nouveau taking matters into its own hand rather >> than keeping this PCI quirk around? > > It sounds to me like the HDA is not powered if no cable is plugged in. > What is reponsible then for powering it up or down, firmware code on > the GPU or in the host's BIOS? Sometimes the BIOS, but definitely unconditionally the PCI quirk code: https://github.com/torvalds/linux/blob/master/drivers/pci/quirks.c#L5289 (CC Aaron Plattner) > > Ideally, we should try to find out how to control HDA power from the > operating system rather than trying to cooperate with whatever firmware > is doing. If we have that capability, the OS should power the HDA up > and down as it sees fit. > > Thanks, > > Lukas >