[alsa-devel] [PATCH 5/8] ASoC: SOF: Intel: drop HDA codec upon probe failure

[Pierre-Louis Bossart]

From: Kai Vehmanen <kai.vehmanen at linux.intel.com>

In case a HDA codec probe fails, do not raise error immediately,
but instead remove the codec from bus->codec_mask and continue
probe for other codecs.

This allows for more robust behaviour in cases where one codec
in the system is faulty. SOF driver load can still proceed with
the codecs that can be probed successfully. Probe may still
fail if suitable machine driver is not found, but in many
cases the generic HDA machine driver can operate with a subset
of codecs.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/intel/hda-codec.c | 12 +++++-------
 sound/soc/sof/intel/hda.h       |  4 ++--
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c
index 65761e095184..d7855b1f8e2e 100644
--- a/sound/soc/sof/intel/hda-codec.c
+++ b/sound/soc/sof/intel/hda-codec.c
@@ -140,8 +140,8 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
 }
 
 /* Codec initialization */
-int hda_codec_probe_bus(struct snd_sof_dev *sdev,
-			bool hda_codec_use_common_hdmi)
+void hda_codec_probe_bus(struct snd_sof_dev *sdev,
+			 bool hda_codec_use_common_hdmi)
 {
 	struct hdac_bus *bus = sof_to_bus(sdev);
 	int i, ret;
@@ -154,13 +154,11 @@ int hda_codec_probe_bus(struct snd_sof_dev *sdev,
 
 		ret = hda_codec_probe(sdev, i, hda_codec_use_common_hdmi);
 		if (ret < 0) {
-			dev_err(bus->dev, "error: codec #%d probe error, ret: %d\n",
-				i, ret);
-			return ret;
+			dev_warn(bus->dev, "codec #%d probe error, ret: %d\n",
+				 i, ret);
+			bus->codec_mask &= ~BIT(i);
 		}
 	}
-
-	return 0;
 }
 EXPORT_SYMBOL(hda_codec_probe_bus);
 
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index 01529c7058f3..47408ec0de40 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -575,8 +575,8 @@ void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev);
 /*
  * HDA Codec operations.
  */
-int hda_codec_probe_bus(struct snd_sof_dev *sdev,
-			bool hda_codec_use_common_hdmi);
+void hda_codec_probe_bus(struct snd_sof_dev *sdev,
+			 bool hda_codec_use_common_hdmi);
 void hda_codec_jack_wake_enable(struct snd_sof_dev *sdev);
 void hda_codec_jack_check(struct snd_sof_dev *sdev);
 
-- 
2.20.1