[PATCH 2/3] ASoC: fsl_micfil: Add fsl_micfil_check_version function

[Chancel Liu <chancel.liu@nxp.com>]

fsl_micfil_check_version can help to parse the version info in VERID
and PARAM registers. Since the two registers are added only on i.MX93
platform, a member flag called check_version is introduced to soc data
structure which indicates need to check version.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
---
 sound/soc/fsl/fsl_micfil.c | 76 +++++++++++++++++++++++++++++++++++++-
 sound/soc/fsl/fsl_micfil.h | 36 ++++++++++++++++++
 2 files changed, 110 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c
index b15febf19c02..46eda6e8c4b6 100644
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -56,6 +56,8 @@ struct fsl_micfil {
 	int vad_init_mode;
 	int vad_enabled;
 	int vad_detected;
+	struct fsl_micfil_verid verid;
+	struct fsl_micfil_param param;
 };
 
 struct fsl_micfil_soc_data {
@@ -64,6 +66,7 @@ struct fsl_micfil_soc_data {
 	unsigned int dataline;
 	bool imx;
 	bool use_edma;
+	bool check_version;
 	u64  formats;
 };
 
@@ -90,6 +93,7 @@ static struct fsl_micfil_soc_data fsl_micfil_imx93 = {
 	.dataline =  0xf,
 	.formats = SNDRV_PCM_FMTBIT_S32_LE,
 	.use_edma = true,
+	.check_version = true,
 };
 
 static const struct of_device_id fsl_micfil_dt_ids[] = {
@@ -356,6 +360,49 @@ static const struct snd_kcontrol_new fsl_micfil_snd_controls[] = {
 	SOC_SINGLE_BOOL_EXT("VAD Detected", 0, hwvad_detected, NULL),
 };
 
+static int fsl_micfil_check_version(struct device *dev)
+{
+	struct fsl_micfil *micfil = dev_get_drvdata(dev);
+	unsigned int val;
+	int ret;
+
+	if (!micfil->soc->check_version)
+		return 0;
+
+	ret = regmap_read(micfil->regmap, REG_MICFIL_VERID, &val);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(dev, "VERID: 0x%016X\n", val);
+
+	micfil->verid.version = val &
+		(MICFIL_VERID_MAJOR_MASK | MICFIL_VERID_MINOR_MASK);
+	micfil->verid.version >>= MICFIL_VERID_MINOR_SHIFT;
+	micfil->verid.feature = val & MICFIL_VERID_FEATURE_MASK;
+
+	ret = regmap_read(micfil->regmap, REG_MICFIL_PARAM, &val);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(dev, "PARAM: 0x%016X\n", val);
+
+	micfil->param.hwvad_num = (val & MICFIL_PARAM_NUM_HWVAD_MASK) >>
+		MICFIL_PARAM_NUM_HWVAD_SHIFT;
+	micfil->param.hwvad_zcd = val & MICFIL_PARAM_HWVAD_ZCD;
+	micfil->param.hwvad_energy_mode = val & MICFIL_PARAM_HWVAD_ENERGY_MODE;
+	micfil->param.hwvad = val & MICFIL_PARAM_HWVAD;
+	micfil->param.dc_out_bypass = val & MICFIL_PARAM_DC_OUT_BYPASS;
+	micfil->param.dc_in_bypass = val & MICFIL_PARAM_DC_IN_BYPASS;
+	micfil->param.low_power = val & MICFIL_PARAM_LOW_POWER;
+	micfil->param.fil_out_width = val & MICFIL_PARAM_FIL_OUT_WIDTH;
+	micfil->param.fifo_ptrwid = (val & MICFIL_PARAM_FIFO_PTRWID_MASK) >>
+		MICFIL_PARAM_FIFO_PTRWID_SHIFT;
+	micfil->param.npair = (val & MICFIL_PARAM_NPAIR_MASK) >>
+		MICFIL_PARAM_NPAIR_SHIFT;
+
+	return 0;
+}
+
 /* The SRES is a self-negated bit which provides the CPU with the
  * capability to initialize the PDM Interface module through the
  * slave-bus interface. This bit always reads as zero, and this
@@ -1037,6 +1084,9 @@ static irqreturn_t hwvad_err_isr(int irq, void *devid)
 	return IRQ_HANDLED;
 }
 
+static int fsl_micfil_runtime_suspend(struct device *dev);
+static int fsl_micfil_runtime_resume(struct device *dev);
+
 static int fsl_micfil_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -1156,6 +1206,25 @@ static int fsl_micfil_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, micfil);
 
 	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = fsl_micfil_runtime_resume(&pdev->dev);
+		if (ret)
+			goto err_pm_disable;
+	}
+
+	ret = pm_runtime_resume_and_get(&pdev->dev);
+	if (ret < 0)
+		goto err_pm_get_sync;
+
+	/* Get micfil version */
+	ret = fsl_micfil_check_version(&pdev->dev);
+	if (ret < 0)
+		dev_warn(&pdev->dev, "Error reading MICFIL version: %d\n", ret);
+
+	ret = pm_runtime_put_sync(&pdev->dev);
+	if (ret < 0 && ret != -ENOSYS)
+		goto err_pm_get_sync;
+
 	regcache_cache_only(micfil->regmap, true);
 
 	/*
@@ -1180,6 +1249,9 @@ static int fsl_micfil_probe(struct platform_device *pdev)
 
 	return ret;
 
+err_pm_get_sync:
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		fsl_micfil_runtime_suspend(&pdev->dev);
 err_pm_disable:
 	pm_runtime_disable(&pdev->dev);
 
@@ -1191,7 +1263,7 @@ static void fsl_micfil_remove(struct platform_device *pdev)
 	pm_runtime_disable(&pdev->dev);
 }
 
-static int __maybe_unused fsl_micfil_runtime_suspend(struct device *dev)
+static int fsl_micfil_runtime_suspend(struct device *dev)
 {
 	struct fsl_micfil *micfil = dev_get_drvdata(dev);
 
@@ -1203,7 +1275,7 @@ static int __maybe_unused fsl_micfil_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused fsl_micfil_runtime_resume(struct device *dev)
+static int fsl_micfil_runtime_resume(struct device *dev)
 {
 	struct fsl_micfil *micfil = dev_get_drvdata(dev);
 	int ret;
diff --git a/sound/soc/fsl/fsl_micfil.h b/sound/soc/fsl/fsl_micfil.h
index b3c392ef5daf..231a52aff024 100644
--- a/sound/soc/fsl/fsl_micfil.h
+++ b/sound/soc/fsl/fsl_micfil.h
@@ -174,4 +174,40 @@
 #define MICFIL_HWVAD_ENVELOPE_MODE	0
 #define MICFIL_HWVAD_ENERGY_MODE	1
 
+/**
+ * struct fsl_micfil_verid - version id data
+ * @version: version number
+ * @feature: feature specification number
+ */
+struct fsl_micfil_verid {
+	u32 version;
+	u32 feature;
+};
+
+/**
+ * struct fsl_micfil_param - parameter data
+ * @hwvad_num: the number of HWVADs
+ * @hwvad_zcd: HWVAD zero-cross detector is active
+ * @hwvad_energy_mode: HWVAD energy mode is active
+ * @hwvad: HWVAD is active
+ * @dc_out_bypass: points out if the output DC remover is disabled
+ * @dc_in_bypass: points out if the input DC remover is disabled
+ * @low_power: low power decimation filter
+ * @fil_out_width: filter output width
+ * @fifo_ptrwid: FIFO pointer width
+ * @npair: number of microphone pairs
+ */
+struct fsl_micfil_param {
+	u32 hwvad_num;
+	bool hwvad_zcd;
+	bool hwvad_energy_mode;
+	bool hwvad;
+	bool dc_out_bypass;
+	bool dc_in_bypass;
+	bool low_power;
+	bool fil_out_width;
+	u32 fifo_ptrwid;
+	u32 npair;
+};
+
 #endif /* _FSL_MICFIL_H */
-- 
2.25.1