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8b8c99bd3e
There maybe an overshoot:
- when disabling, then re-enabling vrefbuf too quickly
- or upon platform reset as external capacitor maybe slow
discharging (VREFBUF is HiZ at reset by default).
VREFBUF is used by ADC/DAC on some boards. An overshoot on the reference
voltage make the conversions inaccurate for a short period of time. So:
- Don't put the VREFBUF in HiZ when disabling, to force an active
discharge.
- Enforce a 1ms OFF/ON delay, also upon reset
Penalty is a 1ms delay is applied (even for a cold boot), when enabling
VREFBUF.
Fixes:
|
||
|---|---|---|
| .. | ||
| acpi_pmc | ||
| battery | ||
| domain | ||
| fuel_gauge | ||
| mfd | ||
| pmic | ||
| regulator | ||
| axp152.c | ||
| axp209.c | ||
| axp221.c | ||
| axp809.c | ||
| axp818.c | ||
| exynos-tmu.c | ||
| ftpmu010.c | ||
| Kconfig | ||
| Makefile | ||
| mt6323.c | ||
| palmas.c | ||
| power_core.c | ||
| power_dialog.c | ||
| power_fsl.c | ||
| power_i2c.c | ||
| power_spi.c | ||
| sy8106a.c | ||
| tps6586x.c | ||
| twl4030.c | ||
| twl6030.c | ||