ASoC: Check that WM8996 FLL started even if we don't have the IRQ

We can directly read the FLL lock status on WM8996 so even if we don't
have an interrupt wired up we can still verify that the FLL started
successfully.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

sound/soc/codecs/wm8996.c

@@ -2054,7 +2054,7 @@ static int wm8996_set_fll(struct snd_soc_codec *codec, int fll_id, int source,
 	struct i2c_client *i2c = to_i2c_client(codec->dev);
 	struct _fll_div fll_div;
 	unsigned long timeout;
-	int ret, reg;
+	int ret, reg, retry;
 
 	/* Any change? */
 	if (source == wm8996->fll_src && Fref == wm8996->fll_fref &&
@@ -2141,17 +2141,29 @@ static int wm8996_set_fll(struct snd_soc_codec *codec, int fll_id, int source,
 	else
 		timeout = msecs_to_jiffies(2);
 
-	/* Allow substantially longer if we've actually got the IRQ */
+	/* Allow substantially longer if we've actually got the IRQ, poll
+	 * at a slightly higher rate if we don't.
+	 */
 	if (i2c->irq)
-		timeout *= 1000;
+		timeout *= 10;
+	else
+		timeout /= 2;
 
-	ret = wait_for_completion_timeout(&wm8996->fll_lock, timeout);
+	for (retry = 0; retry < 10; retry++) {
+		ret = wait_for_completion_timeout(&wm8996->fll_lock,
+						  timeout);
+		if (ret != 0) {
+			WARN_ON(!i2c->irq);
+			break;
+		}
 
-	if (ret == 0 && i2c->irq) {
+		ret = snd_soc_read(codec, WM8996_INTERRUPT_RAW_STATUS_2);
+		if (ret & WM8996_FLL_LOCK_STS)
+			break;
+	}
+	if (retry == 10) {
 		dev_err(codec->dev, "Timed out waiting for FLL\n");
 		ret = -ETIMEDOUT;
-	} else {
-		ret = 0;
 	}
 
 	dev_dbg(codec->dev, "FLL configured for %dHz->%dHz\n", Fref, Fout);