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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 7B633C4361B for ; Wed, 16 Dec 2020 15:59:31 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B0E5322283 for ; Wed, 16 Dec 2020 15:59:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0E5322283 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 0EB1917C4; Wed, 16 Dec 2020 16:58:39 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 0EB1917C4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1608134369; bh=jd2KS4xOoXhoiZ4hrRP9F4qzu331fz83X4EfEc1en5w=; h=Date:From:To:Subject:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=pAtIuBQBJODYkhc8coWQ0JBSNtTYxl8glhdLbFlZLKnZGAieh6lxL4PASxKv14YmM FAZNt5Ahmw69z+LHnxWdXwit8fsdfSpjIvEizPwDTVWSKlvzPzY6Xdv0TBRD8U9SYL dlS9iVuQsiUNSXY12zEf8f0h8Exyd4eEqbqkNQ0o= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 912B6F80168; Wed, 16 Dec 2020 16:58:38 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 8EBF8F80171; Wed, 16 Dec 2020 16:58:36 +0100 (CET) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id A0FE2F8011B for ; Wed, 16 Dec 2020 16:58:30 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz A0FE2F8011B X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C7B6AAC7B; Wed, 16 Dec 2020 15:58:29 +0000 (UTC) Date: Wed, 16 Dec 2020 16:58:29 +0100 Message-ID: From: Takashi Iwai To: Kai-Heng Feng Subject: Re: [PATCH v2] ALSA: hda: Continue to probe when codec probe fails In-Reply-To: References: <20201214060621.1102931-1-kai.heng.feng@canonical.com> <20201216124726.2842197-1-kai.heng.feng@canonical.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Cc: "moderated list:SOUND" , Kai Vehmanen , open list , Pierre-Louis Bossart , tiwai@suse.com, Alex Deucher , Mike Rapoport X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On Wed, 16 Dec 2020 16:50:20 +0100, Kai-Heng Feng wrote: > > On Wed, Dec 16, 2020 at 11:41 PM Takashi Iwai wrote: > > > > On Wed, 16 Dec 2020 13:47:24 +0100, > > Kai-Heng Feng wrote: > > > > > > Similar to commit 9479e75fca37 ("ALSA: hda: Keep the controller > > > initialization even if no codecs found"), when codec probe fails, it > > > doesn't enable runtime suspend, and can prevent graphics card from > > > getting powered down: > > > [ 4.280991] snd_hda_intel 0000:01:00.1: no codecs initialized > > > > > > $ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status > > > active > > > > > > So mark there's no codec and continue probing to let runtime PM to work. > > > > > > BugLink: https://bugs.launchpad.net/bugs/1907212 > > > Signed-off-by: Kai-Heng Feng > > > > Hm, but if the probe fails, doesn't it mean something really wrong? > > IOW, how does this situation happen? > > The HDA controller is forcely created by quirk_nvidia_hda(). So > probably there's really not an HDA controller. I still don't understand how non-zero codec_mask is passed. The non-zero codec_mask means that BIOS or whatever believes that HD-audio codecs are present and let HD-audio controller reporting the presence. What error did you get at probing? > > The usual no-codec state is for the devices that have a bogus HD-audio > > bus remaining while codecs aren't hooked or disabled by BIOS. For > > that, it makes to leave the controller driver and let it idle. But if > > you get really an error, it's something to fix there, not to just > > ignore in general. > > The best approach I can think of is to make current two steps probe > into one. So when probe fails, the driver won't bind to the device. > What's the reason behind the two steps approach? It's a sort of must, as the module loading is involved with binding with the codecs, as well as (optionally) request_firmware() invocation. Takashi