ASoC: fsl_micfil: use define for OSR default value

The OSR (OverSampling Rate) setting is set once to the default value
and never changed throughout the driver. Nevertheless the value is
read back from the register for further calculations. Just use the
default value because we know what we have written.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220414162249.3934543-14-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_micfil.c

@@ -29,6 +29,8 @@
 #define FSL_MICFIL_RATES		SNDRV_PCM_RATE_8000_48000
 #define FSL_MICFIL_FORMATS		(SNDRV_PCM_FMTBIT_S16_LE)
 
+#define MICFIL_OSR_DEFAULT	16
+
 struct fsl_micfil {
 	struct platform_device *pdev;
 	struct regmap *regmap;
@@ -112,11 +114,11 @@ static inline int get_pdm_clk(struct fsl_micfil *micfil,
 			      unsigned int rate)
 {
 	u32 ctrl2_reg;
-	int qsel, osr;
+	int qsel;
 	int bclk;
+	int osr = MICFIL_OSR_DEFAULT;
 
 	regmap_read(micfil->regmap, REG_MICFIL_CTRL2, &ctrl2_reg);
-	osr = 16 - FIELD_GET(MICFIL_CTRL2_CICOSR, ctrl2_reg);
 	qsel = FIELD_GET(MICFIL_CTRL2_QSEL, ctrl2_reg);
 
 	switch (qsel) {
@@ -282,7 +284,7 @@ static int fsl_set_clock_params(struct device *dev, unsigned int rate)
 	/* set CICOSR */
 	ret = regmap_update_bits(micfil->regmap, REG_MICFIL_CTRL2,
 				 MICFIL_CTRL2_CICOSR,
-				 FIELD_PREP(MICFIL_CTRL2_CICOSR, MICFIL_CTRL2_CICOSR_DEFAULT));
+				 FIELD_PREP(MICFIL_CTRL2_CICOSR, 16 - MICFIL_OSR_DEFAULT));
 	if (ret)
 		return ret;
 
@@ -673,7 +675,6 @@ static int fsl_micfil_probe(struct platform_device *pdev)
 	micfil->dma_params_rx.addr = res->start + REG_MICFIL_DATACH0;
 	micfil->dma_params_rx.maxburst = MICFIL_DMA_MAXBURST_RX;
 
-
 	platform_set_drvdata(pdev, micfil);
 
 	pm_runtime_enable(&pdev->dev);

sound/soc/fsl/fsl_micfil.h

@@ -58,7 +58,6 @@
 #define MICFIL_QSEL_VLOW2_QUALITY	4
 
 #define MICFIL_CTRL2_CICOSR		GENMASK(19, 16)
-#define MICFIL_CTRL2_CICOSR_DEFAULT	0
 #define MICFIL_CTRL2_CLKDIV		GENMASK(7, 0)
 
 /* MICFIL Status Register -- REG_MICFIL_STAT 0x08 */