diff options
| author | Mark Brown <broonie@kernel.org> | 2022-05-04 15:30:32 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-05-04 15:30:32 +0100 |
| commit | c0b38be14f1d843c29edc763d3df3cc741a2bf10 (patch) | |
| tree | 7b4923fbd72134f891faa6866246e16b8a4b30dc /sound/soc/codecs/da7219.c | |
| parent | 55d2a66cfec6a4196243940f754f5b34dd2106bf (diff) | |
| parent | a962890a5a3cce903ff7c7a19fadee63ed9efdc7 (diff) | |
| download | linux-c0b38be14f1d843c29edc763d3df3cc741a2bf10.tar.bz2 | |
ASoC: Pull in fixes
Cleanups for the dmaengine code build on top of current fixes.
Diffstat (limited to 'sound/soc/codecs/da7219.c')
| -rw-r--r-- | sound/soc/codecs/da7219.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c index a28d3601b932..7fdef38ed8cd 100644 --- a/sound/soc/codecs/da7219.c +++ b/sound/soc/codecs/da7219.c @@ -446,7 +446,7 @@ static int da7219_tonegen_freq_put(struct snd_kcontrol *kcontrol, struct soc_mixer_control *mixer_ctrl = (struct soc_mixer_control *) kcontrol->private_value; unsigned int reg = mixer_ctrl->reg; - __le16 val; + __le16 val_new, val_old; int ret; /* @@ -454,13 +454,19 @@ static int da7219_tonegen_freq_put(struct snd_kcontrol *kcontrol, * Therefore we need to convert to little endian here to align with * HW registers. */ - val = cpu_to_le16(ucontrol->value.integer.value[0]); + val_new = cpu_to_le16(ucontrol->value.integer.value[0]); mutex_lock(&da7219->ctrl_lock); - ret = regmap_raw_write(da7219->regmap, reg, &val, sizeof(val)); + ret = regmap_raw_read(da7219->regmap, reg, &val_old, sizeof(val_old)); + if (ret == 0 && (val_old != val_new)) + ret = regmap_raw_write(da7219->regmap, reg, + &val_new, sizeof(val_new)); mutex_unlock(&da7219->ctrl_lock); - return ret; + if (ret < 0) + return ret; + + return val_old != val_new; } |