diff mbox series

[v1,10/12] ASoC: rockchip: pdm: adjust waterlevel in frame unit

Message ID 1554350189-24318-1-git-send-email-sugar.zhang@rock-chips.com (mailing list archive)
State New, archived
Headers show
Series None | expand

Commit Message

Sugar Zhang April 4, 2019, 3:56 a.m. UTC 
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@rock-chips.com>
---

 sound/soc/rockchip/rockchip_pdm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index 3e1c5fd..955cdc2 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;
 }