diff options
| author | Xing Zheng <zhengxing@rock-chips.com> | 2018-04-25 08:56:00 +0800 |
|---|---|---|
| committer | Tao Huang <huangtao@rock-chips.com> | 2018-04-26 16:40:53 +0800 |
| commit | 46cb48d1dca64daca199f964d517cb22bb550549 (patch) | |
| tree | 586e0187ba88ccaf3bb24f468f702228365755d7 /sound | |
| parent | f48d45778622b9f64eaac44b3f187b96f90d2192 (diff) | |
ASoC: rk3308_codec: add a bit of delay during enable DAC
The suggestion is from verndor, we should add a bit of
delay in key steps until the reference voltages are
stable, otherwise, the output of voltage maybe too low.
@HPMIX -6dB + LINEOUT -6dB:
normal Vpp: ~450mV
abnormal Vpp: ~100mV
Change-Id: I463d308b809b2c5e74e3bd37573bcbbd624df72e
Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/codecs/rk3308_codec.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/soc/codecs/rk3308_codec.c b/sound/soc/codecs/rk3308_codec.c index f9b465a9bb0d..fd9b1934b02c 100644 --- a/sound/soc/codecs/rk3308_codec.c +++ b/sound/soc/codecs/rk3308_codec.c @@ -761,6 +761,9 @@ static int rk3308_codec_dac_enable(struct rk3308_codec_priv *rk3308) RK3308_DAC_BUF_REF_L_EN | RK3308_DAC_BUF_REF_R_EN); + /* Waiting the stable reference voltage */ + udelay(10); + if (rk3308->dac_output == DAC_HPOUT || rk3308->dac_output == DAC_LINEOUT_HPOUT) { /* Step 03 */ @@ -778,6 +781,9 @@ static int rk3308_codec_dac_enable(struct rk3308_codec_priv *rk3308) RK3308_DAC_L_HPMIX_EN | RK3308_DAC_R_HPMIX_EN); + /* Waiting the stable HPMIX */ + udelay(10); + /* Step 05 */ regmap_update_bits(rk3308->regmap, RK3308_DAC_ANA_CON13, RK3308_DAC_L_HPMIX_WORK | |