ASoC: cs47l90: Wait for asyncclk to stabilise after enable

Give asyncclk at least 1.5ms to settle after being enabled before
starting to use it.

Change-Id: Ic46ccfe875882cc982b9472ec7efc6823c888391
Signed-off-by: Stuart Henderson <stuarth@opensource.cirrus.com>

diff --git a/sound/soc/codecs/cs47l90.c b/sound/soc/codecs/cs47l90.c
index 9540e5c087a2c836c8ce0d063ed48231caa5acc6..23a5bd800e04faf86772d5bb2228edfb8393943a 100644 (file)
--- a/sound/soc/codecs/cs47l90.c
+++ b/sound/soc/codecs/cs47l90.c
@@ -138,6 +138,22 @@ static int cs47l90_adsp_power_ev(struct snd_soc_dapm_widget *w,
        return wm_adsp2_early_event(w, kcontrol, event, freq);
 }
 
+static int cs47l90_asyncclk_ev(struct snd_soc_dapm_widget *w,
+                              struct snd_kcontrol *kcontrol,
+                              int event)
+{
+       switch (event) {
+       case SND_SOC_DAPM_POST_PMU:
+               /* Wait at least 1.5ms for asyncclk to stabilise */
+               usleep_range(1500, 1600);
+               break;
+       default:
+               break;
+       }
+
+       return 0;
+}
+
 #define CS47L90_NG_SRC(name, base) \
        SOC_SINGLE(name " NG HPOUT1L Switch",  base,  0, 1, 0), \
        SOC_SINGLE(name " NG HPOUT1R Switch",  base,  1, 1, 0), \
@@ -771,7 +787,8 @@ SND_SOC_DAPM_SUPPLY("SYSCLK", MADERA_SYSTEM_CLOCK_1, MADERA_SYSCLK_ENA_SHIFT,
                    0, madera_sysclk_ev,
                    SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 SND_SOC_DAPM_SUPPLY("ASYNCCLK", MADERA_ASYNC_CLOCK_1,
-                   MADERA_ASYNC_CLK_ENA_SHIFT, 0, NULL, 0),
+                   MADERA_ASYNC_CLK_ENA_SHIFT, 0, cs47l90_asyncclk_ev,
+                   SND_SOC_DAPM_POST_PMU),
 SND_SOC_DAPM_SUPPLY("OPCLK", MADERA_OUTPUT_SYSTEM_CLOCK,
                    MADERA_OPCLK_ENA_SHIFT, 0, NULL, 0),
 SND_SOC_DAPM_SUPPLY("ASYNCOPCLK", MADERA_OUTPUT_ASYNC_CLOCK,