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ASoC: AMD: Set delay value for the capture case 

ACP->SYSMEM DMA happens at every I2S->SYSMEM period
completion. Thus, there is delay of x frames till
I2S->SYSMEM reaches a period length. This delay is
communicated to user space.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Akshu Agrawal 2018-08-06 12:57:16 +05:30 committed by Mark Brown
parent 662fb3efe7
commit c21c834adb
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GPG Key ID: 24D68B725D5487D0
1 changed files with 14 additions and 1 deletions
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15
sound/soc/amd/acp-pcm-dma.c
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@ -922,6 +922,10 @@ static int acp_dma_hw_params(struct snd_pcm_substream *substream,
rtd->destination = FROM_BLUETOOTH;
rtd->dma_dscr_idx_1 = CAPTURE_START_DMA_DESCR_CH10;
rtd->dma_dscr_idx_2 = CAPTURE_START_DMA_DESCR_CH11;
rtd->byte_cnt_high_reg_offset =
mmACP_I2S_BT_RECEIVE_BYTE_CNT_HIGH;
rtd->byte_cnt_low_reg_offset =
mmACP_I2S_BT_RECEIVE_BYTE_CNT_LOW;
rtd->dma_curr_dscr = mmACP_DMA_CUR_DSCR_11;
adata->capture_i2sbt_stream = substream;
break;
@ -942,6 +946,10 @@ static int acp_dma_hw_params(struct snd_pcm_substream *substream,
rtd->destination = FROM_ACP_I2S_1;
rtd->dma_dscr_idx_1 = CAPTURE_START_DMA_DESCR_CH14;
rtd->dma_dscr_idx_2 = CAPTURE_START_DMA_DESCR_CH15;
rtd->byte_cnt_high_reg_offset =
mmACP_I2S_RECEIVED_BYTE_CNT_HIGH;
rtd->byte_cnt_low_reg_offset =
mmACP_I2S_RECEIVED_BYTE_CNT_LOW;
rtd->dma_curr_dscr = mmACP_DMA_CUR_DSCR_15;
adata->capture_i2ssp_stream = substream;
}
@ -997,7 +1005,7 @@ static snd_pcm_uframes_t acp_dma_pointer(struct snd_pcm_substream *substream)
u32 pos = 0;
u64 bytescount = 0;
u16 dscr;
u32 period_bytes;
u32 period_bytes, delay;
struct snd_pcm_runtime *runtime = substream->runtime;
struct audio_substream_data *rtd = runtime->private_data;
@ -1012,6 +1020,11 @@ static snd_pcm_uframes_t acp_dma_pointer(struct snd_pcm_substream *substream)
pos = period_bytes;
else
pos = 0;
bytescount = acp_get_byte_count(rtd);
if (bytescount > rtd->bytescount)
bytescount -= rtd->bytescount;
delay = do_div(bytescount, period_bytes);
runtime->delay = bytes_to_frames(runtime, delay);
} else {
buffersize = frames_to_bytes(runtime, runtime->buffer_size);
bytescount = acp_get_byte_count(rtd);