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imx233: try to improve audio quality

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Change-Id: Idaee93fae8d407e5968f8571c54957b7b87da3bb
This commit is contained in:
Amaury Pouly 2012-12-02 11:51:17 +01:00
parent 4dd2c5277b
commit d119fb1fc5
2 changed files with 22 additions and 1 deletions
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7
firmware/target/arm/imx233/audioout-imx233.c
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@ -53,6 +53,13 @@ void imx233_audioout_preinit(void)
__REG_CLR(HW_AUDIOOUT_PWRDN) = HW_AUDIOOUT_PWRDN__HEADPHONE;
/* Set HP mode to AB */
__REG_SET(HW_AUDIOOUT_ANACTRL) = HW_AUDIOOUT_ANACTRL__HP_CLASSAB;
/* change biais to -50% */
__REG_CLR(HW_AUDIOOUT_TEST) = HW_AUDIOOUT_TEST__HP_I1_ADJ_BM;
__REG_SET(HW_AUDIOOUT_TEST) = HW_AUDIOOUT_TEST__HP_I1_ADJ_M_50;
__REG_CLR(HW_AUDIOOUT_REFCTRL) = HW_AUDIOOUT_REFCTRL__BIAS_CTRL_BM;
__REG_SET(HW_AUDIOOUT_REFCTRL) = 1 << HW_AUDIOOUT_REFCTRL__BIAS_CTRL_BP;
__REG_SET(HW_AUDIOOUT_REFCTRL) = HW_AUDIOOUT_REFCTRL__RAISE_REF;
__REG_SET(HW_AUDIOOUT_REFCTRL) = HW_AUDIOOUT_REFCTRL__XTAL_BGR_BIAS;
/* Stop holding to ground */
__REG_CLR(HW_AUDIOOUT_ANACTRL) = HW_AUDIOOUT_ANACTRL__HP_HOLD_GND;
/* Set dmawait count to 31 (see errata, workaround random stop) */