ASoC: fsl_micfil: Drop get_pdm_clk()

get_pdm_clk() calculates the PDM clock based on the quality setting,
but really the PDM clock is independent of the quality, it's always
rate * 4 * micfil->osr. Just drop the function and do the calculation
in the caller.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220414162249.3934543-15-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_micfil.c

@@ -110,42 +110,6 @@ static const struct snd_kcontrol_new fsl_micfil_snd_controls[] = {
 		     snd_soc_get_enum_double, snd_soc_put_enum_double),
 };
 
-static inline int get_pdm_clk(struct fsl_micfil *micfil,
-			      unsigned int rate)
-{
-	u32 ctrl2_reg;
-	int qsel;
-	int bclk;
-	int osr = MICFIL_OSR_DEFAULT;
-
-	regmap_read(micfil->regmap, REG_MICFIL_CTRL2, &ctrl2_reg);
-	qsel = FIELD_GET(MICFIL_CTRL2_QSEL, ctrl2_reg);
-
-	switch (qsel) {
-	case MICFIL_QSEL_HIGH_QUALITY:
-		bclk = rate * 8 * osr / 2; /* kfactor = 0.5 */
-		break;
-	case MICFIL_QSEL_MEDIUM_QUALITY:
-	case MICFIL_QSEL_VLOW0_QUALITY:
-		bclk = rate * 4 * osr * 1; /* kfactor = 1 */
-		break;
-	case MICFIL_QSEL_LOW_QUALITY:
-	case MICFIL_QSEL_VLOW1_QUALITY:
-		bclk = rate * 2 * osr * 2; /* kfactor = 2 */
-		break;
-	case MICFIL_QSEL_VLOW2_QUALITY:
-		bclk = rate * osr * 4; /* kfactor = 4 */
-		break;
-	default:
-		dev_err(&micfil->pdev->dev,
-			"Please make sure you select a valid quality.\n");
-		bclk = -1;
-		break;
-	}
-
-	return bclk;
-}
-
 static inline int get_clk_div(struct fsl_micfil *micfil,
 			      unsigned int rate)
 {
@@ -154,7 +118,7 @@ static inline int get_clk_div(struct fsl_micfil *micfil,
 
 	mclk_rate = clk_get_rate(micfil->mclk);
 
-	clk_div = mclk_rate / (get_pdm_clk(micfil, rate) * 2);
+	clk_div = mclk_rate / (rate * MICFIL_OSR_DEFAULT * 8);
 
 	return clk_div;
 }