linux-kernel - Re: [PATCH V1] fix da9052 volatile register definition ommissions

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Date:	Mon, 3 Feb 2014 10:29:19 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	"Anthony Olech <anthony.olech.opensource@...semi.com>" 
	<Anthony.Olech.OpenSource@...semi.com>
Cc:	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	David Dajun Chen <david.chen@...semi.com>
Subject: Re: [PATCH V1] fix da9052 volatile register definition ommissions

> Three of the PMIC registers have some bits that are changed
> autonomously by the PMIC itself (some time) after being set
> by some component driver of the DA9052 PMIC and hence they
> need to be marked as volatile so that the regmap API will
> not cache their values.
> 
> Signed-off-by: Anthony Olech <anthony.olech.opensource@...semi.com>
> Signed-off-by: David Dajun Chen <david.chen@...semi.com>

These are not correct.

Who authored the patch?

> ---
> This patch is relative to linux-next repository tag next-20140128
> 
> The bug that this patch fixes affects two components of DA9052 namely:
> 
> WATCHDOG - the first kick will work but sebsequent ones will not
>            thus the will timeout at 2 x interval.
> 
> REGULATORS - the first change to any DA9052 BUCK voltage will be
>              actioned, but sebsequent ones will not.

Which patch caused the bug?

>  drivers/mfd/da9052-core.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
> index 25838f1..e8af816 100644
> --- a/drivers/mfd/da9052-core.c
> +++ b/drivers/mfd/da9052-core.c
> @@ -279,6 +279,9 @@ static bool da9052_reg_volatile(struct device *dev, unsigned int reg)
>  	case DA9052_EVENT_B_REG:
>  	case DA9052_EVENT_C_REG:
>  	case DA9052_EVENT_D_REG:
> +	case DA9052_CONTROL_B_REG:
> +	case DA9052_CONTROL_D_REG:
> +	case DA9052_SUPPLY_REG:
>  	case DA9052_FAULTLOG_REG:
>  	case DA9052_CHG_TIME_REG:
>  	case DA9052_ADC_RES_L_REG:

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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