[PATCH] mfd: rk808: disable the under voltage detect

[PATCH] mfd: rk808: disable the under voltage detect

[Chris Zhong]

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@rock-chips.com>

---

 drivers/mfd/rk808.c       | 1 +
 include/linux/mfd/rk808.h | 3 +++
 2 files changed, 4 insertions(+)

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)
-- 
1.9.1

Re: [PATCH] mfd: rk808: disable the under voltage detect

[Lee Jones]

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@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
Linaro.org │ Open source software for ARM SoCs
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