From: Daniel Kurtz Date: Mon, 2 Jul 2018 21:19:54 +0000 (-0600) Subject: ASoC: AMD: Do not generate interrups for every captured sample X-Git-Tag: android-x86-8.1-r1~159^2~2^2~205 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=8c6b964eddd2c39a9796899b2be099ece1b6c6ca;p=android-x86%2Fkernel.git 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 Signed-off-by: Mark Brown --- diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c index df53412967e1..cd4d2520ac14 100644 --- a/sound/soc/amd/acp-pcm-dma.c +++ b/sound/soc/amd/acp-pcm-dma.c @@ -412,10 +412,8 @@ static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num) switch (ch_num) { case ACP_TO_I2S_DMA_CH_NUM: case ACP_TO_SYSRAM_CH_NUM: - case I2S_TO_ACP_DMA_CH_NUM: case ACP_TO_I2S_DMA_BT_INSTANCE_CH_NUM: case ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM: - case I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM: dma_ctrl |= ACP_DMA_CNTL_0__DMAChIOCEn_MASK; break; default: @@ -704,12 +702,6 @@ static irqreturn_t dma_irq_handler(int irq, void *arg) acp_mmio, mmACP_EXTERNAL_INTR_STAT); } - if ((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) != 0) { - valid_irq = true; - acp_reg_write((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) << 16, - acp_mmio, mmACP_EXTERNAL_INTR_STAT); - } - if ((intr_flag & BIT(ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM)) != 0) { valid_irq = true; snd_pcm_period_elapsed(irq_data->capture_i2sbt_stream); @@ -718,13 +710,6 @@ static irqreturn_t dma_irq_handler(int irq, void *arg) acp_mmio, mmACP_EXTERNAL_INTR_STAT); } - if ((intr_flag & BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) != 0) { - valid_irq = true; - acp_reg_write((intr_flag & - BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) << 16, - acp_mmio, mmACP_EXTERNAL_INTR_STAT); - } - if (valid_irq) return IRQ_HANDLED; else