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 <cezary.rojewski@xxxxxxxxx>
---
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);
