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no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On 2024-02-26 12:09 PM, Takashi Iwai wrote: > On Fri, 23 Feb 2024 18:09:59 +0100, > Cezary Rojewski wrote: >> >> On 2024-02-23 3:44 PM, Takashi Iwai wrote: >>> On Fri, 23 Feb 2024 12:46:24 +0100, >>> Cezary Rojewski wrote: >>>> >>>> If i915 does not support given platform but the hardware i.e.: HDAudio >>>> codec is still there, the codec-probing procedure will succeed for such >>>> device but the follow up initialization will always end up with -ENODEV. >>>> >>>> While bus could filter out address '2' which Intel's HDMI/DP codecs >>>> always enumerate on, more robust approach is to check for i915 presence >>>> before registering display codecs. >>>> >>>> Signed-off-by: Cezary Rojewski >>>> --- >>>> sound/soc/codecs/hda.c | 5 +++++ >>>> 1 file changed, 5 insertions(+) >>>> >>>> diff --git a/sound/soc/codecs/hda.c b/sound/soc/codecs/hda.c >>>> index d2117e36ddd1..d9e7cd8aada2 100644 >>>> --- a/sound/soc/codecs/hda.c >>>> +++ b/sound/soc/codecs/hda.c >>>> @@ -350,6 +350,11 @@ static int hda_hdev_attach(struct hdac_device *hdev) >>>> struct hda_codec *codec = dev_to_hda_codec(&hdev->dev); >>>> struct snd_soc_component_driver *comp_drv; >>>> + if (hda_codec_is_display(codec) && >>>> !hdev->bus->audio_component) { >>>> + dev_dbg(&hdev->dev, "no i915, skip registration for 0x%08x\n", hdev->vendor_id); >>>> + return 0; >>> >>> Should we return success here, or would it better with -ENODEV? >>> IIUC, the code path is from the early hda_codec_driver_probe() hook, >>> so returning an error can work. >> >> Good suggestion. Indeed attach() is called by probe() which treats >> -ENODEV just fine. >> >> There is a consequence to that though. Logs from LKF show: >> >> snd_soc_hda_codec:hda_hdev_attach: snd_hda_codec_hdmi hdaudioB0D2: no >> i915, skip registration for 0x80862811 >> snd_soc_hda_codec:hda_hdev_attach: snd_hda_codec_generic hdaudioB0D2: >> no i915, skip registration for 0x80862811 >> snd_soc_hda_codec:hda_hdev_attach: snd_hda_codec_generic hdaudioB0D2: >> no i915, skip registration for 0x80862811 >> snd_hda_codec:snd_hda_codec_configure: hdaudio hdaudioB0D2: Unable to >> bind the codec >> snd_soc_avs 0000:00:1f.3: failed to config codec -19 >> snd_soc_avs 0000:00:1f.3: Codec #2 probe error; disabling it... > > Yeah the latter two are basically fallbacks, and I guess we can > disable them for ASoC case? An additional patch like below. Thanks for feedback, Takashi. One of the design philosophies for the avs-driver is to avoid any 'if (bus->ext_ops)' statements if possible. This is to keep runtime flow of snd_hda_intel and its DSP equivalent as close as possible. What I propose is: address the problem directly in the avs-driver by ignoring codecs for which probe_codec() returns -ENODEV. The TLDR of my previous message is: we do not want to do any kind of recovery e.g.: HDAudio controller reset if there is no supporting driver for given codec. Will sent a separate patch as part of v3. > --- a/sound/pci/hda/hda_bind.c > +++ b/sound/pci/hda/hda_bind.c > @@ -279,6 +279,10 @@ static int codec_bind_generic(struct hda_codec *codec) > if (codec->probe_id) > return -ENODEV; > > + /* no generic fallback for ASoC binding */ > + if (codec->bus->core.ext_ops) > + return -ENODEV; > + > if (is_likely_hdmi_codec(codec)) { > codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI; > request_codec_module(codec);