[v2] ASoC: AMD: make channel 1 dma as circular
From: Akshu Agrawal
Date: Sun May 27 2018 - 23:49:25 EST
channel 1: SYSMEM<->ACP
channel 2: ACP<->I2S
Instead of waiting on period interrupt of ch 2 and then starting
dma on ch1, we make ch1 dma as circular.
This removes dependency of period granularity on hw pointer.
Signed-off-by: Akshu Agrawal <akshu.agrawal@xxxxxxx>
Reviewed-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
Tested-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
---
v2: Fixed kbuild error
sound/soc/amd/acp-pcm-dma.c | 74 ++++++---------------------------------------
1 file changed, 10 insertions(+), 64 deletions(-)
diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index ac32dea..7720384 100644
--- a/sound/soc/amd/acp-pcm-dma.c
+++ b/sound/soc/amd/acp-pcm-dma.c
@@ -337,8 +337,7 @@ static void config_acp_dma(void __iomem *acp_mmio,
}
/* Start a given DMA channel transfer */
-static void acp_dma_start(void __iomem *acp_mmio,
- u16 ch_num, bool is_circular)
+static void acp_dma_start(void __iomem *acp_mmio, u16 ch_num)
{
u32 dma_ctrl;
@@ -369,11 +368,8 @@ static void acp_dma_start(void __iomem *acp_mmio,
break;
}
- /* enable for ACP SRAM to/from I2S 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;
+ /* circular for both DMA channel */
+ dma_ctrl |= ACP_DMA_CNTL_0__Circular_DMA_En_MASK;
acp_reg_write(dma_ctrl, acp_mmio, mmACP_DMA_CNTL_0 + ch_num);
}
@@ -617,7 +613,6 @@ 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;
@@ -634,33 +629,13 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
if ((intr_flag & BIT(ACP_TO_I2S_DMA_CH_NUM)) != 0) {
valid_irq = true;
- if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_13) ==
- PLAYBACK_START_DMA_DESCR_CH13)
- dscr_idx = PLAYBACK_END_DMA_DESCR_CH12;
- else
- dscr_idx = PLAYBACK_START_DMA_DESCR_CH12;
- config_acp_dma_channel(acp_mmio, SYSRAM_TO_ACP_CH_NUM, dscr_idx,
- 1, 0);
- acp_dma_start(acp_mmio, SYSRAM_TO_ACP_CH_NUM, false);
-
snd_pcm_period_elapsed(irq_data->play_i2ssp_stream);
-
acp_reg_write((intr_flag & BIT(ACP_TO_I2S_DMA_CH_NUM)) << 16,
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
}
if ((intr_flag & BIT(ACP_TO_I2S_DMA_BT_INSTANCE_CH_NUM)) != 0) {
valid_irq = true;
- if (acp_reg_read(acp_mmio, mmACP_DMA_CUR_DSCR_9) ==
- PLAYBACK_START_DMA_DESCR_CH9)
- dscr_idx = PLAYBACK_END_DMA_DESCR_CH8;
- else
- dscr_idx = PLAYBACK_START_DMA_DESCR_CH8;
- config_acp_dma_channel(acp_mmio,
- SYSRAM_TO_ACP_BT_INSTANCE_CH_NUM,
- dscr_idx, 1, 0);
- acp_dma_start(acp_mmio, SYSRAM_TO_ACP_BT_INSTANCE_CH_NUM,
- false);
snd_pcm_period_elapsed(irq_data->play_i2sbt_stream);
acp_reg_write((intr_flag &
BIT(ACP_TO_I2S_DMA_BT_INSTANCE_CH_NUM)) << 16,
@@ -669,38 +644,20 @@ 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_15) ==
- 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);
}
if ((intr_flag & BIT(ACP_TO_SYSRAM_CH_NUM)) != 0) {
valid_irq = true;
- snd_pcm_period_elapsed(irq_data->capture_i2ssp_stream);
acp_reg_write((intr_flag & BIT(ACP_TO_SYSRAM_CH_NUM)) << 16,
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
}
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_11) ==
- 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,
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
@@ -708,7 +665,6 @@ static irqreturn_t dma_irq_handler(int irq, void *arg)
if ((intr_flag & BIT(ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM)) != 0) {
valid_irq = true;
- snd_pcm_period_elapsed(irq_data->capture_i2sbt_stream);
acp_reg_write((intr_flag &
BIT(ACP_TO_SYSRAM_BT_INSTANCE_CH_NUM)) << 16,
acp_mmio, mmACP_EXTERNAL_INTR_STAT);
@@ -1015,14 +971,10 @@ static int acp_dma_prepare(struct snd_pcm_substream *substream)
static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
int ret;
- u32 loops = 4000;
u64 bytescount = 0;
struct snd_pcm_runtime *runtime = substream->runtime;
- struct snd_soc_pcm_runtime *prtd = substream->private_data;
struct audio_substream_data *rtd = runtime->private_data;
- struct snd_soc_component *component = snd_soc_rtdcom_lookup(prtd,
- DRV_NAME);
if (!rtd)
return -EINVAL;
@@ -1034,18 +986,12 @@ static int acp_dma_trigger(struct snd_pcm_substream *substream, int cmd)
if (rtd->bytescount == 0)
rtd->bytescount = bytescount;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- acp_dma_start(rtd->acp_mmio, rtd->ch1, false);
- while (acp_reg_read(rtd->acp_mmio, mmACP_DMA_CH_STS) &
- BIT(rtd->ch1)) {
- if (!loops--) {
- dev_err(component->dev,
- "acp dma start timeout\n");
- return -ETIMEDOUT;
- }
- cpu_relax();
- }
+ acp_dma_start(rtd->acp_mmio, rtd->ch1);
+ acp_dma_start(rtd->acp_mmio, rtd->ch2);
+ } else {
+ acp_dma_start(rtd->acp_mmio, rtd->ch2);
+ acp_dma_start(rtd->acp_mmio, rtd->ch1);
}
- acp_dma_start(rtd->acp_mmio, rtd->ch2, true);
ret = 0;
break;
case SNDRV_PCM_TRIGGER_STOP:
--
1.9.1