linux-kernel - Re: [PATCH] pinctrl: qcom: spmi-mpp: Fix drive strength setting

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Date:   Mon, 3 Sep 2018 13:58:09 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [PATCH] pinctrl: qcom: spmi-mpp: Fix drive strength setting

On Thu 30 Aug 17:58 PDT 2018, Stephen Boyd wrote:

> It looks like we parse the drive strength setting here, but never
> actually write it into the hardware to update it. Parse the setting and
> then write it at the end of the pinconf setting function so that it
> actually sticks in the hardware.
> 
> Fixes: 0e948042c420 ("pinctrl: qcom: spmi-mpp: Implement support for sink mode")
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Doug Anderson <dianders@...omium.org>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/pinctrl/qcom/pinctrl-spmi-mpp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c b/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
> index 6556dbeae65e..1793a4d05e15 100644
> --- a/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
> +++ b/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
> @@ -455,7 +455,7 @@ static int pmic_mpp_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
>  			pad->dtest = arg;
>  			break;
>  		case PIN_CONFIG_DRIVE_STRENGTH:
> -			arg = pad->drive_strength;
> +			pad->drive_strength = arg;
>  			break;
>  		case PMIC_MPP_CONF_AMUX_ROUTE:
>  			if (arg >= PMIC_MPP_AMUX_ROUTE_ABUS4)
> @@ -502,6 +502,10 @@ static int pmic_mpp_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = pmic_mpp_write(state, pad, PMIC_MPP_REG_SINK_CTL, pad->drive_strength);
> +	if (ret < 0)
> +		return ret;
> +
>  	val = pad->is_enabled << PMIC_MPP_REG_MASTER_EN_SHIFT;
>  
>  	return pmic_mpp_write(state, pad, PMIC_MPP_REG_EN_CTL, val);
> -- 
> Sent by a computer through tubes
>