On Sat, 28 Feb 2015, Chris Zhong wrote:
> Rk808 has a under voltage detect function, when the voltage of buck is
> under 85% the target voltage, the buck output will reset. But if the
> power load is too heavy, this function maybe err, when current over
> 4.2A, although the voltage is normal, but RK808 mistakenly think it is
> under 85%, and reset the buck. So let's disable this function.
>
> Signed-off-by: Chris Zhong <zyw at rock-chips.com>
>
> ---
>
> drivers/mfd/rk808.c | 1 +
> include/linux/mfd/rk808.h | 3 +++
> 2 files changed, 4 insertions(+)
Applied, thanks.
> diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
> index bd02150..7cf25c7 100644
> --- a/drivers/mfd/rk808.c
> +++ b/drivers/mfd/rk808.c
> @@ -89,6 +89,7 @@ static const struct rk808_reg_data pre_init_reg[] = {
> { RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
> { RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK, BUCK_ILMIN_200MA },
> { RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK, BUCK_ILMIN_200MA },
> + { RK808_DCDC_UV_ACT_REG, BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE},
> { RK808_VB_MON_REG, MASK_ALL, VB_LO_ACT |
> VB_LO_SEL_3500MV },
> };
> diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
> index fb09312..441b6ee 100644
> --- a/include/linux/mfd/rk808.h
> +++ b/include/linux/mfd/rk808.h
> @@ -156,6 +156,9 @@ enum rk808_reg {
> #define BUCK2_RATE_MASK (3 << 3)
> #define MASK_ALL 0xff
>
> +#define BUCK_UV_ACT_MASK 0x0f
> +#define BUCK_UV_ACT_DISABLE 0
> +
> #define SWITCH2_EN BIT(6)
> #define SWITCH1_EN BIT(5)
> #define DEV_OFF_RST BIT(3)
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
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