ASoC: SOF: Intel: hda: fix generic hda codec support

Add support for using generic codec driver with SOF. Generic driver
is used if:
 - snd_sof_intel_hda_common.hda_model="generic" is set, or
 - fallback if no other codec driver is found

The implementation is aligned with snd-hda-intel driver, and fixes audio
support for systems like Acer Swift 3 SF314-57G, on which this issue was
originally reported.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Hui Wang <hui.wang@canonical.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
BugLink: https://github.com/thesofproject/linux/issues/1807
BugLink: https://bugs.launchpad.net/bugs/1877757
Link: https://lore.kernel.org/r/20200529160358.12134-1-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c
index c3299be..2c5c451 100644 (file)
--- a/sound/soc/sof/intel/hda-codec.c
+++ b/sound/soc/sof/intel/hda-codec.c
@@ -24,19 +24,44 @@
 #define IDISP_VID_INTEL        0x80860000
 
 /* load the legacy HDA codec driver */
-static int hda_codec_load_module(struct hda_codec *codec)
+static int request_codec_module(struct hda_codec *codec)
 {
 #ifdef MODULE
        char alias[MODULE_NAME_LEN];
-       const char *module = alias;
+       const char *mod = NULL;
 
-       snd_hdac_codec_modalias(&codec->core, alias, sizeof(alias));
-       dev_dbg(&codec->core.dev, "loading codec module: %s\n", module);
-       request_module(module);
+       switch (codec->probe_id) {
+       case HDA_CODEC_ID_GENERIC:
+#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
+               mod = "snd-hda-codec-generic";
 #endif
+               break;
+       default:
+               snd_hdac_codec_modalias(&codec->core, alias, sizeof(alias));
+               mod = alias;
+               break;
+       }
+
+       if (mod) {
+               dev_dbg(&codec->core.dev, "loading codec module: %s\n", mod);
+               request_module(mod);
+       }
+#endif /* MODULE */
        return device_attach(hda_codec_dev(codec));
 }
 
+static int hda_codec_load_module(struct hda_codec *codec)
+{
+       int ret = request_codec_module(codec);
+
+       if (ret <= 0) {
+               codec->probe_id = HDA_CODEC_ID_GENERIC;
+               ret = request_codec_module(codec);
+       }
+
+       return ret;
+}
+
 /* enable controller wake up event for all codecs with jack connectors */
 void hda_codec_jack_wake_enable(struct snd_sof_dev *sdev)
 {
@@ -78,6 +103,13 @@ void hda_codec_jack_check(struct snd_sof_dev *sdev) {}
 EXPORT_SYMBOL_NS(hda_codec_jack_wake_enable, SND_SOC_SOF_HDA_AUDIO_CODEC);
 EXPORT_SYMBOL_NS(hda_codec_jack_check, SND_SOC_SOF_HDA_AUDIO_CODEC);
 
+#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
+#define is_generic_config(bus) \
+       ((bus)->modelname && !strcmp((bus)->modelname, "generic"))
+#else
+#define is_generic_config(x)   0
+#endif
+
 /* probe individual codec */
 static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
                           bool hda_codec_use_common_hdmi)
@@ -87,6 +119,7 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
 #endif
        struct hda_bus *hbus = sof_to_hbus(sdev);
        struct hdac_device *hdev;
+       struct hda_codec *codec;
        u32 hda_cmd = (address << 28) | (AC_NODE_ROOT << 20) |
                (AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
        u32 resp = -1;
@@ -108,6 +141,7 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
 
        hda_priv->codec.bus = hbus;
        hdev = &hda_priv->codec.core;
+       codec = &hda_priv->codec;
 
        ret = snd_hdac_ext_bus_device_init(&hbus->core, address, hdev);
        if (ret < 0)
@@ -122,6 +156,11 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
                hda_priv->need_display_power = true;
        }
 
+       if (is_generic_config(hbus))
+               codec->probe_id = HDA_CODEC_ID_GENERIC;
+       else
+               codec->probe_id = 0;
+
        /*
         * if common HDMI codec driver is not used, codec load
         * is skipped here and hdac_hdmi is used instead
@@ -129,7 +168,7 @@ static int hda_codec_probe(struct snd_sof_dev *sdev, int address,
        if (hda_codec_use_common_hdmi ||
            (resp & 0xFFFF0000) != IDISP_VID_INTEL) {
                hdev->type = HDA_DEV_LEGACY;
-               ret = hda_codec_load_module(&hda_priv->codec);
+               ret = hda_codec_load_module(codec);
                /*
                 * handle ret==0 (no driver bound) as an error, but pass
                 * other return codes without modification