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sound: oxygen: reset DMA when stream is closed
When a PCM stream is closed, flush the corresponding DMA channel. Otherwise, the DMA controller would continue to output the last sample which would result in a DC offset on the output. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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1 changed files with 5 additions and 1 deletions
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@ -487,10 +487,14 @@ static int oxygen_hw_free(struct snd_pcm_substream *substream)
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{
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struct oxygen *chip = snd_pcm_substream_chip(substream);
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unsigned int channel = oxygen_substream_channel(substream);
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unsigned int channel_mask = 1 << channel;
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spin_lock_irq(&chip->reg_lock);
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chip->interrupt_mask &= ~(1 << channel);
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chip->interrupt_mask &= ~channel_mask;
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oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
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oxygen_set_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
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oxygen_clear_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
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spin_unlock_irq(&chip->reg_lock);
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return snd_pcm_lib_free_pages(substream);
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