ASoC: Avoid a redundant read in cs42l51_pdn_event

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>

1 files changed, 5 insertions, 8 deletions

diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 8c3c8205d19e..00718b5e747b 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -175,21 +175,18 @@ static const struct snd_kcontrol_new cs42l51_snd_controls[] = {
 static int cs42l51_pdn_event(struct snd_soc_dapm_widget *w,
                 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) {
         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;
         default:
         case SND_SOC_DAPM_POST_PMD:
+                snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
+                                    CS42L51_POWER_CTL1_PDN, 0);
                 break;
         }
-        snd_soc_update_bits(w->codec, CS42L51_POWER_CTL1,
-                CS42L51_POWER_CTL1_PDN, value);
 
         return 0;
 }