ASoC: fsl_spdif: Print actual sample rate for debug

People would simply know what the driver gets the best for the current
sample rate playback.
Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/fsl/fsl_spdif.c

@@ -75,6 +75,7 @@ struct fsl_spdif_priv {
 	struct platform_device *pdev;
 	struct regmap *regmap;
 	bool dpll_locked;
+	u16 txrate[SPDIF_TXRATE_MAX];
 	u8 txclk_df[SPDIF_TXRATE_MAX];
 	u8 sysclk_df[SPDIF_TXRATE_MAX];
 	u8 txclk_src[SPDIF_TXRATE_MAX];
@@ -418,7 +419,8 @@ static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
 	regmap_update_bits(regmap, REG_SPDIF_STC,
 			   STC_SYSCLK_DF_MASK, STC_SYSCLK_DF(sysclk_df));
 
-	dev_dbg(&pdev->dev, "set sample rate to %d\n", sample_rate);
+	dev_dbg(&pdev->dev, "set sample rate to %dHz for %dHz playback\n",
+			spdif_priv->txrate[rate], sample_rate);
 
 	return 0;
 }
@@ -1049,6 +1051,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 				savesub = 0;
 				spdif_priv->txclk_df[index] = txclk_df;
 				spdif_priv->sysclk_df[index] = sysclk_df;
+				spdif_priv->txrate[index] = arate;
 				goto out;
 			} else if (arate / rate[index] == 1) {
 				/* A little bigger than expect */
@@ -1059,6 +1062,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 				savesub = sub;
 				spdif_priv->txclk_df[index] = txclk_df;
 				spdif_priv->sysclk_df[index] = sysclk_df;
+				spdif_priv->txrate[index] = arate;
 			} else if (rate[index] / arate == 1) {
 				/* A little smaller than expect */
 				sub = (rate[index] - arate) * 100000;
@@ -1068,6 +1072,7 @@ static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
 				savesub = sub;
 				spdif_priv->txclk_df[index] = txclk_df;
 				spdif_priv->sysclk_df[index] = sysclk_df;
+				spdif_priv->txrate[index] = arate;
 			}
 		}
 	}
@@ -1118,6 +1123,8 @@ static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
 	if (spdif_priv->txclk[index] == spdif_priv->sysclk)
 		dev_dbg(&pdev->dev, "use sysclk df %d for %dHz sample rate\n",
 				spdif_priv->sysclk_df[index], rate[index]);
+	dev_dbg(&pdev->dev, "the best rate for %dHz sample rate is %dHz\n",
+			rate[index], spdif_priv->txrate[index]);
 
 	return 0;
 }