[PATCH 6/8] ASoC: arizona: Improve suppression of noop FLL updates

[Charles Keepax <ckeepax@opensource.wolfsonmicro.com>]

Previously updates that only changes FLL source would be missed, this
patch corrects this. We also ensures that both REFCLK and SYNCCLK
frequency changes are considered, in preparation for future updates.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
 sound/soc/codecs/arizona.c |   16 ++++++++++------
 sound/soc/codecs/arizona.h |    3 +--
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index 7ad850c..7283bda 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -1145,10 +1145,12 @@ int arizona_set_fll(struct arizona_fll *fll, int source,
 	struct arizona_fll_cfg ref, sync;
 	int ret;
 
-	if (fll->fref == Fref && fll->fout == Fout)
-		return 0;
-
 	if (fll->ref_src < 0 || fll->ref_src == source) {
+		if (fll->sync_src == -1 &&
+		    fll->ref_src == source && fll->ref_freq == Fref &&
+		    fll->fout == Fout)
+			return 0;
+
 		if (Fout) {
 			ret = arizona_calc_fll(fll, &ref, Fref, Fout);
 			if (ret != 0)
@@ -1159,6 +1161,10 @@ int arizona_set_fll(struct arizona_fll *fll, int source,
 		fll->ref_src = source;
 		fll->ref_freq = Fref;
 	} else if (fll->ref_src != source) {
+		if (fll->sync_src == source &&
+		    fll->sync_freq == Fref && fll->fout == Fout)
+			return 0;
+
 		if (Fout) {
 			ret = arizona_calc_fll(fll, &ref, fll->ref_freq, Fout);
 			if (ret != 0)
@@ -1172,6 +1178,7 @@ int arizona_set_fll(struct arizona_fll *fll, int source,
 		fll->sync_src = source;
 		fll->sync_freq = Fref;
 	}
+	fll->fout = Fout;
 
 	if (Fout) {
 		arizona_enable_fll(fll, &ref, &sync);
@@ -1179,9 +1186,6 @@ int arizona_set_fll(struct arizona_fll *fll, int source,
 		arizona_disable_fll(fll);
 	}
 
-	fll->fref = Fref;
-	fll->fout = Fout;
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(arizona_set_fll);
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index 37766b5..bedf12a 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -198,9 +198,8 @@ struct arizona_fll {
 	unsigned int base;
 	unsigned int vco_mult;
 	struct completion ok;
-	unsigned int fref;
-	unsigned int fout;
 
+	unsigned int fout;
 	int sync_src;
 	unsigned int sync_freq;
 	int ref_src;
-- 
1.7.2.5