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imx233: hopefully fix audio pop on startup

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Change-Id: I6410c0e11acc02ec996461153b4737f416f8cbee
This commit is contained in:
Amaury Pouly 2012-11-13 18:24:44 +01:00
parent 214f226ca6
commit 5ead8f3f44
1 changed files with 21 additions and 3 deletions
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24
firmware/target/arm/imx233/audioout-imx233.c
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@ -24,6 +24,15 @@
#include "pcm_sampr.h"
static int hp_vol_l, hp_vol_r;
static struct timeout hp_unmute_oneshort;
static int hp_unmute_cb(struct timeout *tmo)
{
(void) tmo;
/* unmute HP */
__REG_CLR(HW_AUDIOOUT_HPVOL) = HW_AUDIOOUT_HPVOL__MUTE;
return 0;
}
void imx233_audioout_preinit(void)
{
@ -41,7 +50,6 @@ void imx233_audioout_preinit(void)
__REG_CLR(HW_AUDIOOUT_PWRDN) = HW_AUDIOOUT_PWRDN__DAC;
/* Hold HP to ground to avoid pop, then release and power up HP */
__REG_SET(HW_AUDIOOUT_ANACTRL) = HW_AUDIOOUT_ANACTRL__HP_HOLD_GND;
__REG_SET(HW_RTC_PERSISTENT0) = HW_RTC_PERSISTENT0__SPARE__RELEASE_GND;
__REG_CLR(HW_AUDIOOUT_PWRDN) = HW_AUDIOOUT_PWRDN__HEADPHONE;
/* Set HP mode to AB */
__REG_SET(HW_AUDIOOUT_ANACTRL) = HW_AUDIOOUT_ANACTRL__HP_CLASSAB;
@ -50,12 +58,22 @@ void imx233_audioout_preinit(void)
/* Set dmawait count to 31 (see errata, workaround random stop) */
__REG_CLR(HW_AUDIOOUT_CTRL) = HW_AUDIOOUT_CTRL__DMAWAIT_COUNT_BM;
__REG_SET(HW_AUDIOOUT_CTRL) = 31 << HW_AUDIOOUT_CTRL__DMAWAIT_COUNT_BP;
/* start converting audio */
__REG_SET(HW_AUDIOOUT_CTRL) = HW_AUDIOOUT_CTRL__RUN;
/* unmute DAC */
__REG_CLR(HW_AUDIOOUT_DACVOLUME) = HW_AUDIOOUT_DACVOLUME__MUTE_LEFT |
HW_AUDIOOUT_DACVOLUME__MUTE_RIGHT;
/* send a few samples to avoid pop */
HW_AUDIOOUT_DATA = 0;
HW_AUDIOOUT_DATA = 0;
HW_AUDIOOUT_DATA = 0;
HW_AUDIOOUT_DATA = 0;
/* wait for everything to stabilize before unmuting */
timeout_register(&hp_unmute_oneshort, hp_unmute_cb, HZ / 2, 0);
}
void imx233_audioout_postinit(void)
{
/* start converting audio */
__REG_SET(HW_AUDIOOUT_CTRL) = HW_AUDIOOUT_CTRL__RUN;
}
void imx233_audioout_close(void)