No video during the flight
Don’t know what version of Linux they were running but looks like one of the following code paths triggered the issue:
static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
int ret;
ret = chip->read_regs(chip, reg, val);
if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n");
return ret;
}
return 0;
}
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, int off)
{
int ret;
int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
int offset = off / BANK_SZ;
ret = i2c_smbus_read_byte_data(chip->client,
(reg << bank_shift) + offset);
*val = ret;
if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n");
return ret;
}
return 0;
}