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ASoC: rockchip: pdm: adjust waterlevel in frame unit

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This patch make the waterlevel more reasonable, because the pdm
controller share the single FIFO(128 entries) with each channel.
adjust waterlevel in frame to meet the vad or dma frames request.

Change-Id: I9b5808e55025347d435f47889f39ba34ac07ea1c
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
This commit is contained in:
Sugar Zhang
2018-10-22 10:02:39 +08:00
parent 7b3bf21389
commit 9fb7e51d0b
1 changed files with 2 additions and 1 deletions
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3
sound/soc/rockchip/rockchip_pdm.c
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@@ -255,8 +255,9 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
regmap_update_bits(pdm->regmap, PDM_CTRL0,
PDM_PATH_MSK | PDM_VDW_MSK,
val);
/* all channels share the single FIFO */
regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
PDM_DMA_RDL(16));
PDM_DMA_RDL(8 * params_channels(params)));
return 0;
}