We can choose to drop away any length of data from the beginning according to project needs. Some projects don't want to throw away any data, because they want to use recorded data to do echo cancellation, so they have to make sure that they are aligned with the reference data as much as possible. Or there are other algorithms in the upper layer to eliminate this noise. Or some projects want to eliminate this noise form the kernel layer. However, the minimum recommended value is 50ms to skip pop noise.

Signed-off-by: Jiaxin Yu jiaxin.yu@mediatek.com --- This seems like something that would apply equally to all DMICs so should be done at a more general level, so we implement it in the DMIC driver.

sound/soc/mediatek/Kconfig | 1 + sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/mediatek/Kconfig b/sound/soc/mediatek/Kconfig index dc628fb6c1025..31f1431bf5792 100644 --- a/sound/soc/mediatek/Kconfig +++ b/sound/soc/mediatek/Kconfig @@ -175,6 +175,7 @@ config SND_SOC_MT8192_MT6359_RT1015_RT5682 select SND_SOC_MT6359 select SND_SOC_RT1015 select SND_SOC_RT5682_I2C + select SND_SOC_DMIC help This adds ASoC driver for Mediatek MT8192 boards with the MT6359 RT1015 RT5682 audio codec. diff --git a/sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c b/sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c index 41d8a8567bb38..b7f42a530d069 100644 --- a/sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c +++ b/sound/soc/mediatek/mt8192/mt8192-mt6359-rt1015-rt5682.c @@ -540,7 +540,9 @@ SND_SOC_DAILINK_DEFS(playback_hdmi, SND_SOC_DAILINK_DEFS(primary_codec, DAILINK_COMP_ARRAY(COMP_CPU("ADDA")), DAILINK_COMP_ARRAY(COMP_CODEC("mt6359-sound", - "mt6359-snd-codec-aif1")), + "mt6359-snd-codec-aif1"), + COMP_CODEC("dmic-codec", + "dmic-hifi")), DAILINK_COMP_ARRAY(COMP_EMPTY()));

SND_SOC_DAILINK_DEFS(primary_codec_ch34,