[PATCH] ASoC: rockchip: pdm: adjust waterlevel in frame unit

[Sugar Zhang]

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.

Signed-off-by: Sugar Zhang <sugar.zhang@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 sound/soc/rockchip/rockchip_pdm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index 3e1c5fd5b32b..955cdc2b8fc5 100644
--- a/sound/soc/rockchip/rockchip_pdm.c
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -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;
 }
-- 
2.20.1