Messages in this thread Patch in this message | | | Date | Tue, 11 Nov 2014 08:45:37 +1100 | From | NeilBrown <> | Subject | Re: [alsa-devel] [PATCH 1/3] ASoC: twl4030: don't report EBUSY if no change requested. |
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On Mon, 10 Nov 2014 08:07:50 +0100 Lars-Peter Clausen <lars@metafoo.de> wrote:
> On 11/10/2014 01:45 AM, NeilBrown wrote: > > diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c > > index b6b0cb399599..613b61cee081 100644 > > --- a/sound/soc/codecs/twl4030.c > > +++ b/sound/soc/codecs/twl4030.c > > @@ -957,6 +957,16 @@ static int snd_soc_put_twl4030_opmode_enum_double(struct snd_kcontrol *kcontrol, > > { > > struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); > > struct twl4030_priv *twl4030 = snd_soc_codec_get_drvdata(codec); > > + struct snd_ctl_elem_value currentval; > > > > snd_ctl_elem_value is a bit to big to be put onto the kernel stack. Just > using twl4030_read() should be fine.
That's a shame, it looked so neat....
Using twl4030_read forces i2c access and misses out on the regmap caching.
What do you think of this?
Thanks, NeilBrown
diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c index b6b0cb399599..bdb47a045aa5 100644 --- a/sound/soc/codecs/twl4030.c +++ b/sound/soc/codecs/twl4030.c @@ -957,6 +957,18 @@ static int snd_soc_put_twl4030_opmode_enum_double(struct snd_kcontrol *kcontrol, { struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); struct twl4030_priv *twl4030 = snd_soc_codec_get_drvdata(codec); + const struct soc_enum *e = &twl4030_op_modes_enum; + unsigned int reg_val; + int ret; + + ret = snd_soc_component_read(snd_kcontrol_chip(kcontrol), + e->reg, ®_val); + if (ret) + return ret; + if (ucontrol->value.enumerated.item[0] == + ((reg_val >> e->shift_l) & e->mask)) + /* no change requested, so do nothing */ + return 0; if (twl4030->configured) { dev_err(codec->dev,[unhandled content-type:application/pgp-signature] | |