ASoC: rt712-sdca: detect the SMART_MIC function during the probe stage

We shouldn't do any devm_ based allocation in the io_init(), this need
to happen in the probe(). Luckily, we now have an SDCA helper to look
in ACPI tables if a SMART_MIC function is exposed.

FIXME: the registers are not well handled today, the regmap lists
registers which are not really supported in all platforms. The regmap
needs to throw an error if those registers are accessed without
existing.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Author: plbossart

sound/soc/codecs/rt712-sdca-sdw.c

@@ -507,3 +507,4 @@ module_sdw_driver(rt712_sdca_sdw_driver);
 MODULE_DESCRIPTION("ASoC RT712 SDCA SDW driver");
 MODULE_AUTHOR("Shuming Fan <shumingf@realtek.com>");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(SND_SOC_SDCA);

sound/soc/codecs/rt712-sdca.c

@@ -18,6 +18,7 @@
 #include <linux/pm_runtime.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
+#include <sound/sdca.h>
 #include <linux/soundwire/sdw_registers.h>
 #include <linux/slab.h>
 #include <sound/soc-dapm.h>
@@ -1652,6 +1653,17 @@ int rt712_sdca_init(struct device *dev, struct regmap *regmap,
 	if (ret < 0)
 		return ret;
 
+	/* only add the dmic component if a SMART_MIC function is exposed in ACPI */
+	if (sdca_device_quirk_match(slave, SDCA_QUIRKS_RT712_VB)) {
+		ret =  devm_snd_soc_register_component(dev,
+						       &soc_sdca_dev_rt712_dmic,
+						       rt712_sdca_dmic_dai,
+						       ARRAY_SIZE(rt712_sdca_dmic_dai));
+		if (ret < 0)
+			return ret;
+		rt712->dmic_function_found = true;
+	}
+
 	/* set autosuspend parameters */
 	pm_runtime_set_autosuspend_delay(dev, 3000);
 	pm_runtime_use_autosuspend(dev);
@@ -1799,7 +1811,6 @@ static void rt712_sdca_vb_io_init(struct rt712_sdca_priv *rt712)
 int rt712_sdca_io_init(struct device *dev, struct sdw_slave *slave)
 {
 	struct rt712_sdca_priv *rt712 = dev_get_drvdata(dev);
-	int ret = 0;
 	unsigned int val;
 	struct sdw_slave_prop *prop = &slave->prop;
 
@@ -1829,15 +1840,22 @@ int rt712_sdca_io_init(struct device *dev, struct sdw_slave *slave)
 	rt712->version_id = (val & 0x0f00) >> 8;
 	dev_dbg(&slave->dev, "%s hw_id=0x%x, version_id=0x%x\n", __func__, rt712->hw_id, rt712->version_id);
 
-	if (rt712->version_id == RT712_VA)
+	if (rt712->version_id == RT712_VA) {
+		if (rt712->dmic_function_found) {
+			dev_err(&slave->dev, "%s RT712 VA detected but SMART_MIC function exposed in ACPI\n",
+				__func__);
+			goto suspend;
+		}
+
 		rt712_sdca_va_io_init(rt712);
-	else {
-		/* multilanes and DMIC are supported by rt712vb */
-		ret =  devm_snd_soc_register_component(dev,
-			&soc_sdca_dev_rt712_dmic, rt712_sdca_dmic_dai, ARRAY_SIZE(rt712_sdca_dmic_dai));
-		if (ret < 0)
-			return ret;
+	} else {
+		if (!rt712->dmic_function_found) {
+			dev_err(&slave->dev, "%s RT712 VB detected but no SMART_MIC function exposed in ACPI\n",
+				__func__);
+			goto suspend;
+		}
 
+		/* multilanes and DMIC are supported by rt712vb */
 		prop->lane_control_support = true;
 		rt712_sdca_vb_io_init(rt712);
 	}
@@ -1862,10 +1880,12 @@ int rt712_sdca_io_init(struct device *dev, struct sdw_slave *slave)
 	/* Mark Slave initialization complete */
 	rt712->hw_init = true;
 
+	dev_dbg(&slave->dev, "%s hw_init complete\n", __func__);
+
+suspend:
 	pm_runtime_mark_last_busy(&slave->dev);
 	pm_runtime_put_autosuspend(&slave->dev);
 
-	dev_dbg(&slave->dev, "%s hw_init complete\n", __func__);
 	return 0;
 }
 

sound/soc/codecs/rt712-sdca.h

@@ -36,6 +36,7 @@ struct  rt712_sdca_priv {
 	unsigned int scp_sdca_stat2;
 	unsigned int hw_id;
 	unsigned int version_id;
+	bool dmic_function_found;
 	bool fu0f_dapm_mute;
 	bool fu0f_mixer_l_mute;
 	bool fu0f_mixer_r_mute;