From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Sun, 4 Sep 2011 16:35:47 +0000 (-0700)
Subject: ASoC: Check that WM8996 FLL started even if we don't have the IRQ
X-Git-Tag: v3.3-rc1~14^2~761
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=27b6d92a2434219caad8e3a0bc7b5ea5e44c3702;p=linux.git

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>
---

diff --git a/sound/soc/codecs/wm8996.c b/sound/soc/codecs/wm8996.c
index e5e46075c365..e386d25aba82 100644
--- a/sound/soc/codecs/wm8996.c
+++ b/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);