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zero-gravitas: Poll bq27441 flags at boot 

Sometimes the bq27441 will detect that the battery
misbehaves, and set the SOC1 (CRITICAL CHARGE) flag.

This is not always correct, so this patch checks 8
times over 4 seconds to make sure the bq27441 is
serious.

This is especially useful when powering the device
from an external power supply.
lars/power_fixes
Lars Ivar Miljeteig 2018-02-26 13:24:45 +01:00
parent 0e53f1b338
commit 51944d05a8
1 changed files with 17 additions and 1 deletions
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18
board/reMarkable/zero-gravitas/zero-gravitas.c
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@ -623,6 +623,9 @@ static int check_battery(void)
int ret, flags;
uint8_t message[2];
int counter;
const int battery_poll_limit = 8;
I2C_SET_BUS(I2C_PMIC);
ret = i2c_read(BQ27441_I2C_ADDR, BQ27441_REG_FLAGS, 1, message, sizeof(message));
@ -650,10 +653,23 @@ static int check_battery(void)
printf("Battery fastcharge available\n");
}
counter = 0;
while ( (flags & BQ27441_FLAG_CRITCHARGE) && (counter++ < battery_poll_limit) ) {
mdelay(500);
ret = i2c_read(BQ27441_I2C_ADDR, BQ27441_REG_FLAGS, 1, message, sizeof(message));
if (ret) {
printf("BQ27441 battery flags read failure\n");
return -1;
}
flags = get_unaligned_le16(message);
printf("BQ27441 battery flags: %04x\n", flags);
}
if (flags & BQ27441_FLAG_CRITCHARGE) {
printf("Battery critically low, powering off\n");
return -1;
} else if (flags & BQ27441_FLAG_LOWCHARGE) {
}
if (flags & BQ27441_FLAG_LOWCHARGE) {
printf("Battery low charge\n");
} else if (flags & BQ27441_FLAG_FULLCHARGE) {
printf("Battery full charge\n");