In the default 'auto' mode regulators that are very lightly loaded can be put in PFM mode and fail to regulator properly. Switching them to always use continuous PWM mode has a neglibable affect on system power and garuntees proper regulation under lightly loaded circumstances.
Signed-off-by: Tim Harvey tharvey@gateworks.com --- board/gateworks/gw_ventana/common.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/board/gateworks/gw_ventana/common.c b/board/gateworks/gw_ventana/common.c index 9f5f20f781..b5a0162c5e 100644 --- a/board/gateworks/gw_ventana/common.c +++ b/board/gateworks/gw_ventana/common.c @@ -1596,6 +1596,32 @@ void setup_pmic(void) pmic_reg_write(p, PFUZE100_VGEN6VOL, reg); } } + + /* put all switchers in continuous mode */ + pmic_reg_read(p, PFUZE100_SW1ABMODE, ®); + reg &= ~(SW_MODE_MASK); + reg |= PWM_PWM; + pmic_reg_write(p, PFUZE100_SW1ABMODE, reg); + + pmic_reg_read(p, PFUZE100_SW2MODE, ®); + reg &= ~(SW_MODE_MASK); + reg |= PWM_PWM; + pmic_reg_write(p, PFUZE100_SW2MODE, reg); + + pmic_reg_read(p, PFUZE100_SW3AMODE, ®); + reg &= ~(SW_MODE_MASK); + reg |= PWM_PWM; + pmic_reg_write(p, PFUZE100_SW3AMODE, reg); + + pmic_reg_read(p, PFUZE100_SW3BMODE, ®); + reg &= ~(SW_MODE_MASK); + reg |= PWM_PWM; + pmic_reg_write(p, PFUZE100_SW3BMODE, reg); + + pmic_reg_read(p, PFUZE100_SW4MODE, ®); + reg &= ~(SW_MODE_MASK); + reg |= PWM_PWM; + pmic_reg_write(p, PFUZE100_SW4MODE, reg); }
/* configure LTC3676 PMIC */