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Fri, 18 Dec 2020 09:06:37 +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 A25CCF80168 for ; Fri, 18 Dec 2020 09:06:30 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz A25CCF80168 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 3547EABC6; Fri, 18 Dec 2020 08:06:30 +0000 (UTC) Date: Fri, 18 Dec 2020 09:06:29 +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, Bjorn Helgaas , Alan Stern , Linux PCI , 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 Fri, 18 Dec 2020 06:09:38 +0100, Kai-Heng Feng wrote: > > [+Cc Bjorn, Alan and linux-pci] > > On Thu, Dec 17, 2020 at 12:57 AM Takashi Iwai wrote: > > > > On Wed, 16 Dec 2020 17:22:17 +0100, > > Takashi Iwai wrote: > > > > > > On Wed, 16 Dec 2020 17:07:45 +0100, > > > Kai-Heng Feng wrote: > > > > > > > > On Wed, Dec 16, 2020 at 11:58 PM Takashi Iwai wrote: > > > > > > > > > > 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? > > > > > > > > [ 4.280991] snd_hda_intel 0000:01:00.1: no codecs initialized > > > > Full dmesg here: > > > > https://launchpadlibrarian.net/510351476/dmesg.log > > > > > > The actual problems are shown before that line. > > > > > > [ 4.178848] pci 0000:01:00.1: can't change power state from D3cold to D0 (config space inaccessible) > > > [ 4.179502] snd_hda_intel 0000:01:00.1: can't change power state from D3cold to D0 (config space inaccessible) > > > [ 4.179511] snd_hda_intel 0000:01:00.1: can't change power state from D3hot to D0 (config space inaccessible) > > > .... > > > [ 4.280571] hdaudio hdaudioC1D0: no AFG or MFG node found > > > [ 4.280633] hdaudio hdaudioC1D1: no AFG or MFG node found > > > [ 4.280685] hdaudio hdaudioC1D2: no AFG or MFG node found > > > [ 4.280736] hdaudio hdaudioC1D3: no AFG or MFG node found > > > [ 4.280788] hdaudio hdaudioC1D4: no AFG or MFG node found > > > [ 4.280839] hdaudio hdaudioC1D5: no AFG or MFG node found > > > [ 4.280892] hdaudio hdaudioC1D6: no AFG or MFG node found > > > [ 4.280943] hdaudio hdaudioC1D7: no AFG or MFG node found > > > > > > Could you check the codec_mask value read in > > > sound/hda/hdac_controller.c? I guess it reads 0xff. > > > > > > If that's the case, it can be corrected by the patch below. > > > But, we should check the cause of the first error (inaccessible config > > > space) in anyway; this must be the primary reason of the whole chain > > > of errors. > > > > Now I took a deeper look at the code. So we hit errors after errors: > > - The first problem is that quirk_nvidia_hda() enabled HD-audio even > > if it's non-functional by some reason. We may need additional > > checks there. > > Quite possibly the system doesn't power up HDA controller when there's > no external monitor. > So when it's connected to external monitor, it's still needed for HDMI audio. > Let me ask the user to confirm this. Yeah, it's the basic question whether the HD-audio is supposed to work on this machine at all. If yes, the current approach we take makes less sense - instead we should rather make the HD-audio controller working. > > - The second problem is that pci_enable_device() ignores the error > > returned from pci_set_power_state() if it's -EIO. And the > > inaccessible access error returns -EIO, although it's rather a fatal > > problem. So the driver believes as the PCI device gets enabled > > properly. > > This was introduced in 2005, by Alan's 11f3859b1e85 ("[PATCH] PCI: Fix > regression in pci_enable_device_bars") to fix UHCI controller. > > > > > - The third problem is that HD-audio driver blindly believes the > > codec_mask read from the register even if it's a read failure as I > > already showed. > > This approach has least regression risk. Yes, but it assumes that HD-audio is really non-existent. thanks, Takashi