From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Wed, 22 Apr 2009 19:32:40 +0000 (+0100)
Subject: ASoC: Optimise configuration of WM8903 DC servo
X-Git-Tag: firefly_0821_release~12446^2~79^2~83
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4dbfe8097157fde1f8054f48f991ea45833852cd;p=firefly-linux-kernel-4.4.55.git

ASoC: Optimise configuration of WM8903 DC servo

Modify the default startup sequence in the chip to set the DC servo
dither level for optimal performance.

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

diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
index 27c8b94c0551..de0a58507202 100644
--- a/sound/soc/codecs/wm8903.c
+++ b/sound/soc/codecs/wm8903.c
@@ -978,6 +978,11 @@ static int wm8903_set_bias_level(struct snd_soc_codec *codec,
 			wm8903_write(codec, WM8903_CLOCK_RATES_2,
 				     WM8903_CLK_SYS_ENA);
 
+			/* Change DC servo dither level in startup sequence */
+			wm8903_write(codec, WM8903_WRITE_SEQUENCER_0, 0x11);
+			wm8903_write(codec, WM8903_WRITE_SEQUENCER_1, 0x1257);
+			wm8903_write(codec, WM8903_WRITE_SEQUENCER_2, 0x2);
+
 			wm8903_run_sequence(codec, 0);
 			wm8903_sync_reg_cache(codec, codec->reg_cache);