mfd: sec-core: Disable buck voltage reset on watchdog falling edge

The WRSTBI bit (disabled by default but enabled by bootloader), when
set, is responsible for resetting voltages to default values of
certain bucks on falling edge of Warm Reset Input pin from AP.

However on some boards (with S2MPS13) the pin is pulled down so any
suspend will effectively trigger the reset of bucks supplying the power
to the little and big cores. In the same time when resuming, these bucks
must provide voltage greater or equal to voltage before suspend to match
the frequency chosen by cpufreq. If voltage (default value of voltage
after reset) is lower than one set by cpufreq before suspend, then
system will hang during resuming.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index 589e5efc2d7fcc051402bd89c3d92d109312b518..2626fc0b5b8cf199eab8cdfe7854797275afbba2 100644 (file)
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -262,6 +262,29 @@ static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
                dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
 }
 
+static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
+{
+       int err;
+
+       if (sec_pmic->device_type != S2MPS13X)
+               return;
+
+       if (sec_pmic->pdata->disable_wrstbi) {
+               /*
+                * If WRSTBI pin is pulled down this feature must be disabled
+                * because each Suspend to RAM will trigger buck voltage reset
+                * to default values.
+                */
+               err = regmap_update_bits(sec_pmic->regmap_pmic,
+                                        S2MPS13_REG_WRSTBI,
+                                        S2MPS13_REG_WRSTBI_MASK, 0x0);
+               if (err)
+                       dev_warn(sec_pmic->dev,
+                                "Cannot initialize WRSTBI config: %d\n",
+                                err);
+       }
+}
+
 #ifdef CONFIG_OF
 /*
  * Only the common platform data elements for s5m8767 are parsed here from the
@@ -289,6 +312,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 
        pd->manual_poweroff = of_property_read_bool(dev->of_node,
                                                "samsung,s2mps11-acokb-ground");
+       pd->disable_wrstbi = of_property_read_bool(dev->of_node,
+                                               "samsung,s2mps11-wrstbi-ground");
        return pd;
 }
 #else
@@ -434,6 +459,7 @@ static int sec_pmic_probe(struct i2c_client *i2c,
                goto err_mfd;
 
        device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
+       sec_pmic_configure(sec_pmic);
        sec_pmic_dump_rev(sec_pmic);
 
        return ret;

diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
index aa78957e092fff7152f745d0c40b8dfc20be1397..a0609863939912d4c5f9b3c47acc66c8ac2ee46f 100644 (file)
--- a/include/linux/mfd/samsung/core.h
+++ b/include/linux/mfd/samsung/core.h
@@ -134,6 +134,8 @@ struct sec_platform_data {
        int                             buck4_init;
        /* Whether or not manually set PWRHOLD to low during shutdown. */
        bool                            manual_poweroff;
+       /* Disable the WRSTBI (buck voltage warm reset) when probing? */
+       bool                            disable_wrstbi;
 };
 
 /**

diff --git a/include/linux/mfd/samsung/s2mps13.h b/include/linux/mfd/samsung/s2mps13.h
index b1fd675fa36f36a7ec5b68d2ba9d76684ad3bcfd..239e977ba45d97a83391092ed5065f1c0902188f 100644 (file)
--- a/include/linux/mfd/samsung/s2mps13.h
+++ b/include/linux/mfd/samsung/s2mps13.h
@@ -184,5 +184,6 @@ enum s2mps13_regulators {
  * Let's assume that default value will be set.
  */
 #define S2MPS13_BUCK_RAMP_DELAY                12500
+#define S2MPS13_REG_WRSTBI_MASK                BIT(5)
 
 #endif /*  __LINUX_MFD_S2MPS13_H */