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ASoC: AMD: make channel 1 dma as circular 

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@amd.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Agrawal, Akshu 2018-05-28 11:48:22 +08:00 committed by Mark Brown
parent bcf441acb4
commit 6b116dfb46
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 10 additions and 64 deletions
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74
sound/soc/amd/acp-pcm-dma.c
View File

@ -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: