ASoC: Tegra: Don't return mclk_changed from utils_set_rate

Only the clock programming code needs to know whether the clocks changed,
and that is encapsulated within tegra_asoc_utils_set_rate(). The machine
driver's call to snd_soc_dai_set_sysclk(codec_dai, ...) is safe
irrespective of whether the clocks changed.

(Applying Mark's TrimSlice review comments to the existing driver)

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/tegra/tegra_asoc_utils.c

@@ -28,9 +28,10 @@
 #include "tegra_asoc_utils.h"
 
 int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
-			      int mclk, int *mclk_change)
+			      int mclk)
 {
 	int new_baseclock;
+	bool clk_change;
 	int err;
 
 	switch (srate) {
@@ -52,10 +53,10 @@ int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
 		return -EINVAL;
 	}
 
-	*mclk_change = ((new_baseclock != data->set_baseclock) ||
+	clk_change = ((new_baseclock != data->set_baseclock) ||
 			(mclk != data->set_mclk));
-	if (!*mclk_change)
-	    return 0;
+	if (!clk_change)
+		return 0;
 
 	data->set_baseclock = 0;
 	data->set_mclk = 0;

sound/soc/tegra/tegra_asoc_utils.h

@@ -36,7 +36,7 @@ struct tegra_asoc_utils_data {
 };
 
 int tegra_asoc_utils_set_rate(struct tegra_asoc_utils_data *data, int srate,
-			      int mclk, int *mclk_change);
+			      int mclk);
 int tegra_asoc_utils_init(struct tegra_asoc_utils_data *data,
 			  struct device *dev);
 void tegra_asoc_utils_fini(struct tegra_asoc_utils_data *data);

sound/soc/tegra/tegra_wm8903.c

@@ -72,7 +72,7 @@ static int tegra_wm8903_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_codec *codec = rtd->codec;
 	struct snd_soc_card *card = codec->card;
 	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
-	int srate, mclk, mclk_change;
+	int srate, mclk;
 	int err;
 
 	srate = params_rate(params);
@@ -90,8 +90,7 @@ static int tegra_wm8903_hw_params(struct snd_pcm_substream *substream,
 	while (mclk < 6000000)
 		mclk *= 2;
 
-	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk,
-					&mclk_change);
+	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
 	if (err < 0) {
 		dev_err(card->dev, "Can't configure clocks\n");
 		return err;
@@ -115,13 +114,11 @@ static int tegra_wm8903_hw_params(struct snd_pcm_substream *substream,
 		return err;
 	}
 
-	if (mclk_change) {
-		err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
-					     SND_SOC_CLOCK_IN);
-		if (err < 0) {
-			dev_err(card->dev, "codec_dai clock not set\n");
-			return err;
-		}
+	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
+					SND_SOC_CLOCK_IN);
+	if (err < 0) {
+		dev_err(card->dev, "codec_dai clock not set\n");
+		return err;
 	}
 
 	return 0;