diff options
Diffstat (limited to 'driver/charger/bq25710.c')
| -rw-r--r-- | driver/charger/bq25710.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/driver/charger/bq25710.c b/driver/charger/bq25710.c index 8e418ea103..c4035d2f1b 100644 --- a/driver/charger/bq25710.c +++ b/driver/charger/bq25710.c @@ -21,6 +21,14 @@ #error "BQ25710 is a NVDC charger, please enable CONFIG_CHARGER_NARROW_VDC." #endif +/* + * Delay required from taking the bq25710 out of low power mode and having the + * correct value in register 0x3E for VSYS_MIN voltage. The length of the delay + * was determined by experiment. Less than 12 msec was not enough of delay, so + * the value here is set to 20 msec to have plenty of margin. + */ +#define BQ25710_VDDA_STARTUP_DELAY_MSEC 20 + /* Sense resistor configurations and macros */ #define DEFAULT_SENSE_RESISTOR 10 @@ -184,9 +192,14 @@ static void bq25710_init(void) * this chip so without a full power cycle, some registers may not be at * their default values. Note, need to save the POR value of * MIN_SYSTEM_VOLTAGE register prior to setting the reset so that the - * correct value is preserved. + * correct value is preserved. In order to have the correct value read, + * the bq25710 must not be in low power mode, otherwise the VDDA rail + * may not be powered if AC is not connected. */ - rv = raw_read16(BQ25710_REG_MIN_SYSTEM_VOLTAGE, &vsys); + rv = bq25710_set_low_power_mode(0); + /* Allow enough time for VDDA to be powered */ + msleep(BQ25710_VDDA_STARTUP_DELAY_MSEC); + rv |= raw_read16(BQ25710_REG_MIN_SYSTEM_VOLTAGE, &vsys); rv |= raw_read16(BQ25710_REG_CHARGE_OPTION_3, ®); if (!rv) { reg |= BQ25710_CHARGE_OPTION_3_RESET_REG; @@ -195,6 +208,8 @@ static void bq25710_init(void) /* Restore VSYS_MIN voltage to POR reset value */ raw_write16(BQ25710_REG_MIN_SYSTEM_VOLTAGE, vsys); } + /* Reenable low power mode */ + bq25710_set_low_power_mode(1); if (!raw_read16(BQ25710_REG_PROCHOT_OPTION_1, ®)) { /* Disbale VDPM prochot profile at initialization */ |