diff options
| -rw-r--r-- | drivers/mfd/qcom-i2c-pmic.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/mfd/qcom-i2c-pmic.c b/drivers/mfd/qcom-i2c-pmic.c index ea5ac972b096..590e4c1a3f52 100644 --- a/drivers/mfd/qcom-i2c-pmic.c +++ b/drivers/mfd/qcom-i2c-pmic.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2016 The Linux Foundation. All rights reserved. +/* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -467,12 +467,29 @@ static int i2c_pmic_parse_dt(struct i2c_pmic *chip) return rc; } +#define MAX_I2C_RETRIES 3 +static int i2c_pmic_read(struct regmap *map, unsigned int reg, void *val, + size_t val_count) +{ + int rc, retries = 0; + + do { + rc = regmap_bulk_read(map, reg, val, val_count); + } while (rc == -ENOTCONN && retries++ < MAX_I2C_RETRIES); + + if (retries > 1) + pr_err("i2c_pmic_read failed for %d retries, rc = %d\n", + retries - 1, rc); + + return rc; +} + static int i2c_pmic_determine_initial_status(struct i2c_pmic *chip) { int rc, i; for (i = 0; i < chip->num_periphs; i++) { - rc = regmap_bulk_read(chip->regmap, + rc = i2c_pmic_read(chip->regmap, chip->periph[i].addr | INT_SET_TYPE_OFFSET, chip->periph[i].cached, IRQ_MAX_REGS); if (rc < 0) { |