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

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Message-ID: <20150306120333.GE3318@x1>
Date:	Fri, 6 Mar 2015 12:03:33 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	heiko@...ech.de, dianders@...omium.org, dtor@...omium.org,
	djkurtz@...omium.org, sonnyrao@...omium.org,
	linux-rockchip@...ts.infradead.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: rk808: disable the under voltage detect

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@...k-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
Follow Linaro: Facebook | Twitter | Blog
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