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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-02-09 19:04:11 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-02-09 23:51:12 +0100
commitb66a70d5e9929f3b0df5a7177bba75652d2f4c3e (patch)
treef5c517d5771badee1c81cfbca8bd6d036cf52a01 /sound
parentASoC: Improve WM8994 digital power sequencing (diff)
downloadlinux-b66a70d5e9929f3b0df5a7177bba75652d2f4c3e.tar.xz
linux-b66a70d5e9929f3b0df5a7177bba75652d2f4c3e.zip
ASoC: Sync initial widget state with hardware
ASoC generally uses the register defaults for everything, but in some cases the hardware will default to enabling some of the DAPM widgets (clocks for example). Ensure that DAPM knows about the actual widget state at initialisation by reading the enable bits after instantiating the widgets so they don't get left enabled needlessly. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/soc-dapm.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 8194f150bab7..4df96ec9a813 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1627,6 +1627,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
{
struct snd_soc_dapm_widget *w;
+ unsigned int val;
list_for_each_entry(w, &dapm->card->widgets, list)
{
@@ -1675,6 +1676,18 @@ int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
case snd_soc_dapm_post:
break;
}
+
+ /* Read the initial power state from the device */
+ if (w->reg >= 0) {
+ val = snd_soc_read(w->codec, w->reg);
+ val &= 1 << w->shift;
+ if (w->invert)
+ val = !val;
+
+ if (val)
+ w->power = 1;
+ }
+
w->new = 1;
}