ASoC: Only tweak WM8994 chip configuration on devices up to rev D

Any subsequent revisions will have these configuration changes applied
by default.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 2dc9daa..522249d 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -95,6 +95,7 @@ struct wm8994_priv {
 
        struct wm8994_micdet micdet[2];
 
+       int revision;
        struct wm8994_pdata *pdata;
 };
 
@@ -3070,6 +3071,8 @@ static int wm8994_set_dai_sysclk(struct snd_soc_dai *dai,
 static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                                 enum snd_soc_bias_level level)
 {
+       struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
+
        switch (level) {
        case SND_SOC_BIAS_ON:
                break;
@@ -3084,10 +3087,14 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                if (codec->bias_level == SND_SOC_BIAS_OFF) {
                        /* Tweak DC servo and DSP configuration for
                         * improved performance. */
-                       snd_soc_write(codec, 0x102, 0x3);
-                       snd_soc_write(codec, 0x56, 0x3);
-                       snd_soc_write(codec, 0x817, 0);
-                       snd_soc_write(codec, 0x102, 0);
+                       if (wm8994->revision < 4) {
+                               /* Tweak DC servo and DSP configuration for
+                                * improved performance. */
+                               snd_soc_write(codec, 0x102, 0x3);
+                               snd_soc_write(codec, 0x56, 0x3);
+                               snd_soc_write(codec, 0x817, 0);
+                               snd_soc_write(codec, 0x102, 0);
+                       }
 
                        /* Discharge LINEOUT1 & 2 */
                        snd_soc_update_bits(codec, WM8994_ANTIPOP_1,
@@ -3920,7 +3927,6 @@ static int wm8994_codec_probe(struct platform_device *pdev)
        struct wm8994_priv *wm8994;
        struct snd_soc_codec *codec;
        int i;
-       u16 rev;
 
        if (wm8994_codec) {
                dev_err(&pdev->dev, "Another WM8994 is registered\n");
@@ -3974,8 +3980,8 @@ static int wm8994_codec_probe(struct platform_device *pdev)
                        wm8994->reg_cache[i] = 0;
 
        /* Set revision-specific configuration */
-       rev = snd_soc_read(codec, WM8994_CHIP_REVISION);
-       switch (rev) {
+       wm8994->revision = snd_soc_read(codec, WM8994_CHIP_REVISION);
+       switch (wm8994->revision) {
        case 2:
        case 3:
                wm8994->hubs.dcs_codes = -5;