From: Sugar Zhang Date: Fri, 9 Jun 2017 08:52:46 +0000 (+0800) Subject: ASoC: rockchip: i2s: add a delay before i2s clear X-Git-Tag: v4.13-rc1~142^2~1^2~7^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5894b91d1e700f38b4157df143be1502cf08daa8;p=karo-tx-linux.git ASoC: rockchip: i2s: add a delay before i2s clear in order to guarantee i2s lrck signal integrity, when i2s stop, need at least one lrck cycle to ensure signal integrity. the max delay time is when lrck is 8khz, the delay time is 125us(1/8khz), using udelay(150) with a 25us margin. Signed-off-by: Sugar Zhang Signed-off-by: Mark Brown --- diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c index 974915cb4c4f..f54843342ee2 100644 --- a/sound/soc/rockchip/rockchip_i2s.c +++ b/sound/soc/rockchip/rockchip_i2s.c @@ -116,6 +116,7 @@ static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on) I2S_XFER_TXS_STOP | I2S_XFER_RXS_STOP); + udelay(150); regmap_update_bits(i2s->regmap, I2S_CLR, I2S_CLR_TXC | I2S_CLR_RXC, I2S_CLR_TXC | I2S_CLR_RXC); @@ -162,6 +163,7 @@ static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on) I2S_XFER_TXS_STOP | I2S_XFER_RXS_STOP); + udelay(150); regmap_update_bits(i2s->regmap, I2S_CLR, I2S_CLR_TXC | I2S_CLR_RXC, I2S_CLR_TXC | I2S_CLR_RXC);