linux-kernel - [PATCH 2/2] ASoC: rockchip: i2s: set TDL and RDL to 16 bits

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Message-Id: <1419325709-15374-3-git-send-email-jay.xu@rock-chips.com>
Date:	Tue, 23 Dec 2014 17:08:29 +0800
From:	Jianqun Xu <jay.xu@...k-chips.com>
To:	lgirdwood@...il.com, heiko@...ech.de, broonie@...nel.org,
	perex@...ex.cz, tiwai@...e.de, sonnyrao@...omium.org
Cc:	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Jianqun Xu <jay.xu@...k-chips.com>
Subject: [PATCH 2/2] ASoC: rockchip: i2s: set TDL and RDL to 16 bits

Set Transmit Data Level(TDL) and Receive Data Level(RDL) to 16 bits.
Without this setting, the TDL is default to be 0x00 (means 1 bit),
and the RDL is default to be 0x1f (means 16 bits).

This patch is helpful to fix pop sound, tested on rk3288 board.

Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
---
 sound/soc/rockchip/rockchip_i2s.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index c74ba37..1cd7efc 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -247,6 +247,10 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	regmap_update_bits(i2s->regmap, I2S_TXCR, I2S_TXCR_VDW_MASK, val);
 	regmap_update_bits(i2s->regmap, I2S_RXCR, I2S_RXCR_VDW_MASK, val);
+	regmap_update_bits(i2s->regmap, I2S_DMACR, I2S_DMACR_TDL_MASK,
+			   I2S_DMACR_TDL(16));
+	regmap_update_bits(i2s->regmap, I2S_DMACR, I2S_DMACR_RDL_MASK,
+			   I2S_DMACR_RDL(16));
 
 	return 0;
 }
-- 
1.9.1


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