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ASoC: Avoid a redundant read in cs42l51_pdn_event

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snd_soc_update_bits already does read-modify-write,
no need to read the register before calling snd_soc_update_bits.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2011-11-01 15:17:57 +08:00 committed by Mark Brown
parent 65ff03f462
commit e94de1e864
1 changed files with 5 additions and 8 deletions
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13
sound/soc/codecs/cs42l51.c
View file

@ -175,21 +175,18 @@ static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w, static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event) struct snd_kcontrol *kcontrol, int event)
{ {
unsigned long value;
value = snd_soc_read(w->codec, CS42L51_POWER_CTL1);
value &= ~CS42L51_POWER_CTL1_PDN;
switch (event) { switch (event) {
case SND_SOC_DAPM_PRE_PMD: case SND_SOC_DAPM_PRE_PMD:
value |= CS42L51_POWER_CTL1_PDN; snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
CS42L51_POWER_CTL1_PDN,
CS42L51_POWER_CTL1_PDN);
break; break;
default: default:
case SND_SOC_DAPM_POST_PMD: case SND_SOC_DAPM_POST_PMD:
snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
CS42L51_POWER_CTL1_PDN, 0);
break; break;
} }
snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
CS42L51_POWER_CTL1_PDN, value);
return 0; return 0;
} }