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On startup, applications such as PulseAudio or CRAS enable playback or capture on all PCM devices to verify that configurations are correct, and close them immediately. For DMICs, this can result in the clock being turned off very quickly, which may not compatible with internal state machine transition requirements. This patch add a mode-switch delay which will prevent the clock from being turned off without complying with manufacturer timing specifications. While the DMIC clock may be controlled at a lower level, be it with hardware or firmware, applying the delay during the STOP_TRIGGER phase ensures that there is no race condition, e.g. with the hardware/firmware turning off the clock earlier Signed-off-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com> Signed-off-by: Jairaj Arava <jairaj.arava@intel.com> Signed-off-by: Harsha Priya <harshapriya.n@intel.com> Signed-off-by: Jenny TC <jenny.tc@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
23 lines
627 B
Plaintext
23 lines
627 B
Plaintext
Device-Tree bindings for Digital microphone (DMIC) codec
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This device support generic PDM digital microphone.
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Required properties:
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- compatible: should be "dmic-codec".
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Optional properties:
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- dmicen-gpios: GPIO specifier for dmic to control start and stop
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- num-channels: Number of microphones on this DAI
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- wakeup-delay-ms: Delay (in ms) after enabling the DMIC
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- modeswitch-delay-ms: Delay (in ms) to complete DMIC mode switch
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Example node:
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dmic_codec: dmic@0 {
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compatible = "dmic-codec";
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dmicen-gpios = <&gpio4 3 GPIO_ACTIVE_HIGH>;
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num-channels = <1>;
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wakeup-delay-ms <50>;
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modeswitch-delay-ms <35>;
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};
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