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authorJarkko Nikula <jhnikula@gmail.com>2011-05-20 09:52:38 -0400
committerLiam Girdwood <lrg@ti.com>2011-05-23 05:36:44 -0400
commit9fb352b18b11124ed1ddebc0d74ebbd7ba8defd7 (patch)
treeeba7979bf81596d16d28fdc28fcd13a45f1650de /sound
parent508b76864c18f34f8d6ba08d192f5817f8dc8ead (diff)
ASoC: tlv320aic3x: Do soft reset to codec when going to bias off state
TLV320AIC33, TLV320AIC34 and I believe others too in this family have some hw bugs that cause that analogue and digital VDD supplies remain leaking up to a few mA of current after certain use cases even the hw blocks inside codec are driven to off. Highest leakages occur after using the bypass paths inside codec but it is possible to get smaller leakages just by toggling mute switches in unused audio paths (i.e. no DAPM changes) while codec is on due another active audio path. While some cases are able to workaroud by making sure that e.g. output mixer switches are muted before powering down the output stage this doesn't help all the cases. Therefore use the software reset command to clear possible leakage currents since that works in every cases and affects only this codec instance. Only drawback is that now cache sync is required everytime when codec bias comes out from bias off state, not only when supply regulators were off. Signed-off-by: Jarkko Nikula <jhnikula@gmail.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@ti.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/tlv320aic3x.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c
index 9047bb173c6b..789453d44ec5 100644
--- a/sound/soc/codecs/tlv320aic3x.c
+++ b/sound/soc/codecs/tlv320aic3x.c
@@ -1120,6 +1120,13 @@ static int aic3x_set_power(struct snd_soc_codec *codec, int power)
1120 aic3x_init_3007(codec); 1120 aic3x_init_3007(codec);
1121 codec->cache_sync = 0; 1121 codec->cache_sync = 0;
1122 } else { 1122 } else {
1123 /*
1124 * Do soft reset to this codec instance in order to clear
1125 * possible VDD leakage currents in case the supply regulators
1126 * remain on
1127 */
1128 snd_soc_write(codec, AIC3X_RESET, SOFT_RESET);
1129 codec->cache_sync = 1;
1123 aic3x->power = 0; 1130 aic3x->power = 0;
1124 /* HW writes are needless when bias is off */ 1131 /* HW writes are needless when bias is off */
1125 codec->cache_only = 1; 1132 codec->cache_only = 1;