diff options
| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2015-10-07 09:44:41 +0900 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2015-10-30 17:20:37 +0000 |
| commit | 8a97d4287e2659f3460a8dec61ccc935154726c0 (patch) | |
| tree | d1d6a7c84147b53bc2470e60fffec0eaf36bd1c6 /include/linux/mfd | |
| parent | c2c9f1fe4bf2d6597bbaaab7514d9c9092b5b2f6 (diff) | |
| download | op-kernel-dev-8a97d4287e2659f3460a8dec61ccc935154726c0.zip op-kernel-dev-8a97d4287e2659f3460a8dec61ccc935154726c0.tar.gz | |
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>
Diffstat (limited to 'include/linux/mfd')
| -rw-r--r-- | include/linux/mfd/samsung/core.h | 2 | ||||
| -rw-r--r-- | include/linux/mfd/samsung/s2mps13.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h index aa78957..a060986 100644 --- 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 b1fd675..239e977 100644 --- 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 */ |
