From: Marcus Cooper codekipper@gmail.com
On the newer SoCs such as the H3 and A64 this is set by default to transfer a 0 after each sample in each slot. However the A10 and A20 SoCs that this driver was developed on had a default setting where it padded the audio gain with zeros.
This isn't a problem whilst we have only support for 16bit audio but with larger sample resolution rates in the pipeline then SEXT bits should be cleared so that they also pad at the LSB. Without this the audio gets distorted.
Signed-off-by: Marcus Cooper codekipper@gmail.com Signed-off-by: Clément Péron peron.clem@gmail.com --- sound/soc/sunxi/sun4i-i2s.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c index a23c9f2a3f8c..e5f00be8cdcf 100644 --- a/sound/soc/sunxi/sun4i-i2s.c +++ b/sound/soc/sunxi/sun4i-i2s.c @@ -663,6 +663,12 @@ static int sun4i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s, } regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG, SUN4I_I2S_CTRL_MODE_MASK, val); + + /* Set sign extension to pad out LSB with 0 */ + regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT1_REG, + SUN4I_I2S_FMT1_REG_SEXT_MASK, + SUN4I_I2S_FMT1_REG_SEXT(0)); + return 0; }
@@ -765,6 +771,11 @@ static int sun8i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s, SUN8I_I2S_CTRL_BCLK_OUT | SUN8I_I2S_CTRL_LRCK_OUT, val);
+ /* Set sign extension to pad out LSB with 0 */ + regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT1_REG, + SUN8I_I2S_FMT1_REG_SEXT_MASK, + SUN8I_I2S_FMT1_REG_SEXT(0)); + return 0; }
@@ -867,6 +878,11 @@ static int sun50i_i2s_set_soc_fmt(const struct sun4i_i2s *i2s, SUN8I_I2S_CTRL_BCLK_OUT | SUN8I_I2S_CTRL_LRCK_OUT, val);
+ /* Set sign extension to pad out LSB with 0 */ + regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT1_REG, + SUN8I_I2S_FMT1_REG_SEXT_MASK, + SUN8I_I2S_FMT1_REG_SEXT(0)); + return 0; }