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ASoC: tlv320aic3x: Fix codec pll configure bug

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In sound/soc/codecs/tlv320aic3x.c

        data = snd_soc_read(codec, AIC3X_PLL_PROGA_REG);
        snd_soc_write(codec, AIC3X_PLL_PROGA_REG,
                      data | (pll_p << PLLP_SHIFT));

In the above code, pll-p value is OR'ed with previous value without
clearing it. Bug is not seen if pll-p value doesn't change across
Sampling frequency.

However on some platforms (like AM335x EVM-SK), pll-p may have different
values across different sampling frequencies. In such case, above code
configures the pll with a wrong value.
Because of this bug, when a audio stream is played with pll value
different from previous stream, audio is heard as differently(like its
stretched).

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Hebbar, Gururaja 2012-06-26 19:25:11 +05:30 committed by Mark Brown
parent b0dfa4541e
commit c9fe573a65
2 changed files with 2 additions and 3 deletions
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4
sound/soc/codecs/tlv320aic3x.c
View file

@ -935,9 +935,7 @@ static int aic3x_hw_params(struct snd_pcm_substream *substream,
}
found:
data = snd_soc_read(codec, AIC3X_PLL_PROGA_REG);
snd_soc_write(codec, AIC3X_PLL_PROGA_REG,
data | (pll_p << PLLP_SHIFT));
snd_soc_update_bits(codec, AIC3X_PLL_PROGA_REG, PLLP_MASK, pll_p);
snd_soc_write(codec, AIC3X_OVRF_STATUS_AND_PLLR_REG,
pll_r << PLLR_SHIFT);
snd_soc_write(codec, AIC3X_PLL_PROGB_REG, pll_j << PLLJ_SHIFT);

1
sound/soc/codecs/tlv320aic3x.h
View file

@ -166,6 +166,7 @@
/* PLL registers bitfields */
#define PLLP_SHIFT 0
#define PLLP_MASK 7
#define PLLQ_SHIFT 3
#define PLLR_SHIFT 0
#define PLLJ_SHIFT 2