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| author | Mac Chiang <mac.chiang@intel.com> | 2019-06-19 18:18:33 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-07-02 15:53:38 +0100 |
| commit | cec5b01f8f1c6064037f3181e7690e3765ed995b (patch) | |
| tree | 949b286a836edef11b1abb61976680a2bcbf94de /Documentation | |
| parent | 4b9b73b86571e8a03fb09232ff72177e66bf9ef9 (diff) | |
ASoC: max98357a: avoid speaker pop when playback startup
Loud speaker pop happens during playback even when in slience
playback. Specify Max98357a amp delay times to make sure
clocks are always earlier than sdmode on.
Signed-off-by: Mac Chiang <mac.chiang@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/max98357a.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/max98357a.txt b/Documentation/devicetree/bindings/sound/max98357a.txt index 28645a2ff885..4bce14ce806f 100644 --- a/Documentation/devicetree/bindings/sound/max98357a.txt +++ b/Documentation/devicetree/bindings/sound/max98357a.txt @@ -9,6 +9,10 @@ Optional properties: - sdmode-gpios : GPIO specifier for the chip's SD_MODE pin. If this option is not specified then driver does not manage the pin state (e.g. chip is always on). +- sdmode-delay : specify delay time for SD_MODE pin. + If this option is specified, which means it's required i2s clocks + ready before SD_MODE is unmuted in order to avoid the speaker pop noise. + It's observed that 5ms is sufficient. Example: |