ASoC: arizona: Improve suppression of noop FLL updates

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>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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->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);

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;