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bootloader: Only apply VDDSDIO 1.8V->1.9V if regulator is enabled

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Fixes bug if regulator is disabled via efuse.
This commit is contained in:
Angus Gratton 2017-11-27 10:33:41 +11:00 committed by Angus Gratton
parent 75ff6dce15
commit fccc30d2d5
2 changed files with 5 additions and 4 deletions
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6
components/bootloader/Kconfig.projbuild
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@ -44,14 +44,16 @@ config BOOTLOADER_SPI_WP_PIN
The default value (GPIO 7) is correct for WP pin on ESP32-D2WD integrated flash.
config BOOTLOADER_VDDSDIO_BOOST
bool "Increase VDDSDIO LDO voltage to 1.9V"
bool "Increase VDDSDIO 1.8V LDO voltage to 1.9V"
default y
help
If this option is enabled, and VDDSDIO LDO is set to 1.8V (using EFUSE
or MTDI bootstrapping pin), bootloader will change LDO settings to
output 1.9V instead. This helps prevent flash chip from browning out
during flash programming operations.
For 3.3V flash, this option has no effect.
This option has no effect if VDDSDIO is set to 3.3V, or if the internal
VDDSDIO regulator is disabled via efuse.
endmenu # Bootloader

3
components/bootloader/subproject/main/bootloader_start.c
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@ -745,12 +745,11 @@ static void vddsdio_configure()
{
#if CONFIG_BOOTLOADER_VDDSDIO_BOOST
rtc_vddsdio_config_t cfg = rtc_vddsdio_get_config();
if (cfg.tieh == 0) { // 1.8V is used
if (cfg.enable == 1 && cfg.tieh == 0) { // VDDSDIO regulator is enabled @ 1.8V
cfg.drefh = 3;
cfg.drefm = 3;
cfg.drefl = 3;
cfg.force = 1;
cfg.enable = 1;
rtc_vddsdio_set_config(cfg);
ets_delay_us(10); // wait for regulator to become stable
}