[alsa-devel] [PATCH 3/4] ASoC: arizona: Increase FLL synchroniser bandwidth for high frequencies

[Mark Brown]

If we are using a high freqency SYNCCLK then increasing the bandwidth of
the synchroniser improves performance.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/arizona.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index 81da6ef..41c116f 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -1342,6 +1342,17 @@ static void arizona_enable_fll(struct arizona_fll *fll,
 		return;
 	}
 
+	/*
+	 * Increase the bandwidth if we're not using a low frequency
+	 * sync source.
+	 */
+	if (fll->sync_src >= 0 && fll->sync_freq > 100000)
+		regmap_update_bits(arizona->regmap, fll->base + 0x17,
+				   ARIZONA_FLL1_SYNC_BW, 0);
+	else
+		regmap_update_bits(arizona->regmap, fll->base + 0x17,
+				   ARIZONA_FLL1_SYNC_BW, ARIZONA_FLL1_SYNC_BW);
+
 	if (!arizona_is_enabled_fll(fll))
 		pm_runtime_get(arizona->dev);
 
-- 
1.7.10.4