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| author | Steve Twiss <stwiss.opensource@diasemi.com> | 2016-07-06 17:12:03 +0200 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2016-10-04 16:48:02 +0200 |
| commit | 547120edbacba09ae8becab65aa86e3fd4e75e9a (patch) | |
| tree | 51490ef01f6132caa334a3871f3e1d05d6124bae /drivers/mfd | |
| parent | mfd: dm355evm_msp: Refactoring for add_child() (diff) | |
| download | linux-547120edbacba09ae8becab65aa86e3fd4e75e9a.tar.xz linux-547120edbacba09ae8becab65aa86e3fd4e75e9a.zip | |
mfd: da9053: Ensure the FAULT_LOG is cleared during MFD driver probe
The function da9052_clear_fault_log() is added to mitigate the case of
persistent data being transferred between reboots.
Clearance of any the persistent information within the DA9053 FAULT_LOG
register must be completed during start-up so the fault-log does not
continue with previous values. A clearance function has been added here in
the kernel driver because wiping the fault-log cannot be counted on outside
the Linux kernel.
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: Adam Thomson <adam.thomson.opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/da9052-core.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c index c0bf68a3e614..a88c2065d8ab 100644 --- a/drivers/mfd/da9052-core.c +++ b/drivers/mfd/da9052-core.c @@ -167,6 +167,7 @@ static bool da9052_reg_writeable(struct device *dev, unsigned int reg) case DA9052_EVENT_B_REG: case DA9052_EVENT_C_REG: case DA9052_EVENT_D_REG: + case DA9052_FAULTLOG_REG: case DA9052_IRQ_MASK_A_REG: case DA9052_IRQ_MASK_B_REG: case DA9052_IRQ_MASK_C_REG: @@ -541,6 +542,52 @@ const struct regmap_config da9052_regmap_config = { }; EXPORT_SYMBOL_GPL(da9052_regmap_config); +static int da9052_clear_fault_log(struct da9052 *da9052) +{ + int ret = 0; + int fault_log = 0; + + fault_log = da9052_reg_read(da9052, DA9052_FAULTLOG_REG); + if (fault_log < 0) { + dev_err(da9052->dev, + "Cannot read FAULT_LOG %d\n", fault_log); + return fault_log; + } + + if (fault_log) { + if (fault_log & DA9052_FAULTLOG_TWDERROR) + dev_dbg(da9052->dev, + "Fault log entry detected: TWD_ERROR\n"); + if (fault_log & DA9052_FAULTLOG_VDDFAULT) + dev_dbg(da9052->dev, + "Fault log entry detected: VDD_FAULT\n"); + if (fault_log & DA9052_FAULTLOG_VDDSTART) + dev_dbg(da9052->dev, + "Fault log entry detected: VDD_START\n"); + if (fault_log & DA9052_FAULTLOG_TEMPOVER) + dev_dbg(da9052->dev, + "Fault log entry detected: TEMP_OVER\n"); + if (fault_log & DA9052_FAULTLOG_KEYSHUT) + dev_dbg(da9052->dev, + "Fault log entry detected: KEY_SHUT\n"); + if (fault_log & DA9052_FAULTLOG_NSDSET) + dev_dbg(da9052->dev, + "Fault log entry detected: nSD_SHUT\n"); + if (fault_log & DA9052_FAULTLOG_WAITSET) + dev_dbg(da9052->dev, + "Fault log entry detected: WAIT_SHUT\n"); + + ret = da9052_reg_write(da9052, + DA9052_FAULTLOG_REG, + 0xFF); + if (ret < 0) + dev_err(da9052->dev, + "Cannot reset FAULT_LOG values %d\n", ret); + } + + return ret; +} + int da9052_device_init(struct da9052 *da9052, u8 chip_id) { struct da9052_pdata *pdata = dev_get_platdata(da9052->dev); @@ -549,6 +596,10 @@ int da9052_device_init(struct da9052 *da9052, u8 chip_id) mutex_init(&da9052->auxadc_lock); init_completion(&da9052->done); + ret = da9052_clear_fault_log(da9052); + if (ret < 0) + dev_warn(da9052->dev, "Cannot clear FAULT_LOG\n"); + if (pdata && pdata->init != NULL) pdata->init(da9052); |