ASoC: Skip noop reconfiguration of WM8958 DSP2 algorithms

If we're setting the currently applied value for one of the DSP algorithm
configurations we can just skip all the handling as the control set is a
noop. This ensures we do not disrupt a running DSP.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Cc: stable@kernel.org

sound/soc/codecs/wm8958-dsp2.c

@@ -508,6 +508,9 @@ static int wm8958_mbc_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 
+	if (wm8994->mbc_ena[mbc] == ucontrol->value.integer.value[0])
+		return 0;
+
 	if (ucontrol->value.integer.value[0] > 1)
 		return -EINVAL;
 
@@ -628,6 +631,9 @@ static int wm8958_vss_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 
+	if (wm8994->vss_ena[vss] == ucontrol->value.integer.value[0])
+		return 0;
+
 	if (ucontrol->value.integer.value[0] > 1)
 		return -EINVAL;
 
@@ -689,6 +695,16 @@ static int wm8958_hpf_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 
+	if (hpf < 3) {
+		if (wm8994->hpf1_ena[hpf % 3] ==
+		    ucontrol->value.integer.value[0])
+			return 0;
+	} else {
+		if (wm8994->hpf2_ena[hpf % 3] ==
+		    ucontrol->value.integer.value[0])
+			return 0;
+	}
+
 	if (ucontrol->value.integer.value[0] > 1)
 		return -EINVAL;
 
@@ -782,6 +798,9 @@ static int wm8958_enh_eq_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 	struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
 
+	if (wm8994->enh_eq_ena[eq] == ucontrol->value.integer.value[0])
+		return 0;
+
 	if (ucontrol->value.integer.value[0] > 1)
 		return -EINVAL;