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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2015-10-07 03:44:41 +0300
committerLee Jones <lee.jones@linaro.org>2015-10-30 20:20:37 +0300
commit8a97d4287e2659f3460a8dec61ccc935154726c0 (patch)
treed1d6a7c84147b53bc2470e60fffec0eaf36bd1c6 /include/linux/mfd/samsung
parentc2c9f1fe4bf2d6597bbaaab7514d9c9092b5b2f6 (diff)
downloadlinux-8a97d4287e2659f3460a8dec61ccc935154726c0.tar.xz
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/samsung')
-rw-r--r--include/linux/mfd/samsung/core.h2
-rw-r--r--include/linux/mfd/samsung/s2mps13.h1
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
index aa78957e092f..a06098639399 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 b1fd675fa36f..239e977ba45d 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 */