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ASoC: wm8994: Slightly optimize configure_clock
snd_soc_update_bits() will only write new register value if the old value is different from the new value. In additional, snd_soc_update_bits() returns 0 for no change. No need to read WM8994_CLOCKING_1 register before calling snd_soc_update_bits(). Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -208,7 +208,7 @@ static int configure_aif_clock(struct snd_soc_codec *codec, int aif)
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static int configure_clock(struct snd_soc_codec *codec)
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{
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struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
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int old, new;
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int change, new;
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/* Bring up the AIF clocks first */
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configure_aif_clock(codec, 0);
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@ -229,14 +229,11 @@ static int configure_clock(struct snd_soc_codec *codec)
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else
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new = 0;
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old = snd_soc_read(codec, WM8994_CLOCKING_1) & WM8994_SYSCLK_SRC;
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/* If there's no change then we're done. */
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if (old == new)
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change = snd_soc_update_bits(codec, WM8994_CLOCKING_1,
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WM8994_SYSCLK_SRC, new);
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if (!change)
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return 0;
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snd_soc_update_bits(codec, WM8994_CLOCKING_1, WM8994_SYSCLK_SRC, new);
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snd_soc_dapm_sync(&codec->dapm);
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return 0;
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