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ASoC: AMD: Make ACP->SYSMEM DMA non circular 

In capture case we don't want ACP to SYSMEM dma
to be circular. This is because if an in place DSP
filter is applied to captured output then circular DMA
can overwrite the filter value with stale data.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Akshu Agrawal 2018-08-06 12:57:14 +05:30 committed by Mark Brown
parent ad0eaee619
commit bbdb7012b0
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 31 additions and 5 deletions
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36
sound/soc/amd/acp-pcm-dma.c
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@ -400,7 +400,7 @@ static void acp_dma_cap_channel_disable(void __iomem *acp_mmio,
}
/* Start a given DMA channel transfer */
static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num)
static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num, bool is_circular)
{
u32 dma_ctrl;
@ -429,8 +429,11 @@ static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num)
break;
}
/* circular for both DMA channel */
dma_ctrl |= ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
/* enable for ACP to SRAM DMA channel */
if (is_circular == true)
dma_ctrl |= ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
else
dma_ctrl &= ~ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
}
@ -674,6 +677,7 @@ static int acp_deinit(void __iomem *acp_mmio)
/* ACP DMA irq handler routine for playback, capture usecases */
static irqreturn_t dma_irq_handler(int irq, void *arg)
{
u16 dscr_idx;
u32 intr_flag, ext_intr_status;
struct audio_drv_data *irq_data;
void __iomem *acp_mmio;
@ -705,6 +709,15 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
if ((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) != 0) {
valid_irq = true;
if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_14) ==
CAPTURE_START_DMA_DESCR_CH15)
dscr_idx = CAPTURE_END_DMA_DESCR_CH14;
else
dscr_idx = CAPTURE_START_DMA_DESCR_CH14;
config_acp_dma_channel(acp_mmio, ACP_TO_SYSRAM_CH_NUM, dscr_idx,
1, 0);
acp_dma_start(acp_mmio, ACP_TO_SYSRAM_CH_NUM, false);
snd_pcm_period_elapsed(irq_data->capture_i2ssp_stream);
acp_reg_write((intr_flag & BIT(I2S_TO_ACP_DMA_CH_NUM)) << 16,
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
@ -712,6 +725,17 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
if ((intr_flag & BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) != 0) {
valid_irq = true;
if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_10) ==
CAPTURE_START_DMA_DESCR_CH11)
dscr_idx = CAPTURE_END_DMA_DESCR_CH10;
else
dscr_idx = CAPTURE_START_DMA_DESCR_CH10;
config_acp_dma_channel(acp_mmio,
ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM,
dscr_idx, 1, 0);
acp_dma_start(acp_mmio, ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM,
false);
snd_pcm_period_elapsed(irq_data->capture_i2sbt_stream);
acp_reg_write((intr_flag &
BIT(I2S_TO_ACP_DMA_BT_INSTANCE_CH_NUM)) << 16,
@ -1053,9 +1077,11 @@ static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
acp_dma_cap_channel_enable(rtd->acp_mmio,
CAP_CHANNEL1);
}
acp_dma_start(rtd->acp_mmio, rtd->ch1, true);
} else {
acp_dma_start(rtd->acp_mmio, rtd->ch1, true);
acp_dma_start(rtd->acp_mmio, rtd->ch2, true);
}
acp_dma_start(rtd->acp_mmio, rtd->ch1);
acp_dma_start(rtd->acp_mmio, rtd->ch2);
ret = 0;
break;
case SNDRV_PCM_TRIGGER_STOP: