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ASoC: AMD: Do not generate interrups for every captured sample
On capture, audio data is first copied from I2S to ACP memory, and then from ACP to SYSRAM. The I2S_TO_ACP_DMA interrupt fires on every sample transferred from I2S to ACP memory. That is it fires ~48000 times per second when capturing @ 48 kHz. Since we don't do anything on this interrupt anyway, disable it to save quite a few unnecessary interrupts. The real "work" (calling snd_pcm_period_elapsed()) is done when transfer from ACP to SYSRAM is complete. Signed-off-by: Daniel Kurtz <djkurtz@chromium.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -412,10 +412,8 @@ static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num)
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switch (ch_num) {
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case ACP_TO_I2S_DMA_CH_NUM:
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case ACP_TO_SYSRAM_CH_NUM:
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case I2S_TO_ACP_DMA_CH_NUM:
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case ACP_TO_I2S_DMA_BT_INSTANCE_CH_NUM:
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case ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM:
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case I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM:
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dma_ctrl |= ACP_DMA_CNTL_0__DMAChIOCEn_MASK;
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break;
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default:
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@ -704,12 +702,6 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
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acp_mmio, mmACP_EXTERNAL_INTR_STAT);
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}
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if ((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) != 0) {
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valid_irq = true;
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acp_reg_write((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) << 16,
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acp_mmio, mmACP_EXTERNAL_INTR_STAT);
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}
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if ((intr_flag & BIT(ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM)) != 0) {
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valid_irq = true;
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snd_pcm_period_elapsed(irq_data->capture_i2sbt_stream);
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@ -718,13 +710,6 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
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acp_mmio, mmACP_EXTERNAL_INTR_STAT);
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}
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if ((intr_flag & BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) != 0) {
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valid_irq = true;
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acp_reg_write((intr_flag &
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BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) << 16,
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acp_mmio, mmACP_EXTERNAL_INTR_STAT);
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}
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if (valid_irq)
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return IRQ_HANDLED;
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else
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