linux-kernel - Re: [PATCH v5] usb: typec: qcom: Update the logic of regulator enable and disable

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Date:   Mon, 4 Sep 2023 10:04:51 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     quic_huliu@...cinc.com
Cc:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_fenglinw@...cinc.com,
        subbaram@...cinc.com
Subject: Re: [PATCH v5] usb: typec: qcom: Update the logic of regulator
 enable and disable

On Thu, Aug 31, 2023 at 06:19:45PM +0800, Hui Liu via B4 Relay wrote:
> From: Hui Liu <quic_huliu@...cinc.com>
> 
> Removed the call logic of disable and enable regulator
> in reset function. Enable the regulator in qcom_pmic_typec_start
> function and disable it in qcom_pmic_typec_stop function to
> avoid unbalanced regulator disable warnings.
> 
> Fixes: a4422ff22142 ("usb: typec: qcom: Add Qualcomm PMIC Type-C driver")
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Acked-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Tested-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org> # rb5
> Signed-off-by: Hui Liu <quic_huliu@...cinc.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> Changes in v5:
> - Removed Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> - Updated V4 history
> - Link to v4: https://lore.kernel.org/r/20230830-qcom-tcpc-v4-1-c19b0984879b@quicinc.com
> 
> Changes in v4:
> - Rephrased commit text
> - Link to v3: https://lore.kernel.org/r/20230828-qcom-tcpc-v3-1-e95b7afa34d9@quicinc.com
> 
> Changes in v3:
> - Take Bryan's proposal to remove enable/disable operation in pdphy
> enable and pdphy disable function, then enable regulator in pdphy start
> function and disable it in pdphy stop function.
> - Link to v2: https://lore.kernel.org/r/20230824-qcom-tcpc-v2-1-3dd8c3424564@quicinc.com
> 
> Changes in v2:
> - Add Fixes tag
> - Link to v1: https://lore.kernel.org/r/20230823-qcom-tcpc-v1-1-fa81a09ca056@quicinc.com
> ---
>  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
> index bb0b8479d80f..52c81378e36e 100644
> --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
> +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
> @@ -381,10 +381,6 @@ static int qcom_pmic_typec_pdphy_enable(struct pmic_typec_pdphy *pmic_typec_pdph
>  	struct device *dev = pmic_typec_pdphy->dev;
>  	int ret;
>  
> -	ret = regulator_enable(pmic_typec_pdphy->vdd_pdphy);
> -	if (ret)
> -		return ret;
> -
>  	/* PD 2.0, DR=TYPEC_DEVICE, PR=TYPEC_SINK */
>  	ret = regmap_update_bits(pmic_typec_pdphy->regmap,
>  				 pmic_typec_pdphy->base + USB_PDPHY_MSG_CONFIG_REG,
> @@ -422,8 +418,6 @@ static int qcom_pmic_typec_pdphy_disable(struct pmic_typec_pdphy *pmic_typec_pdp
>  	ret = regmap_write(pmic_typec_pdphy->regmap,
>  			   pmic_typec_pdphy->base + USB_PDPHY_EN_CONTROL_REG, 0);
>  
> -	regulator_disable(pmic_typec_pdphy->vdd_pdphy);
> -
>  	return ret;
>  }
>  
> @@ -447,6 +441,10 @@ int qcom_pmic_typec_pdphy_start(struct pmic_typec_pdphy *pmic_typec_pdphy,
>  	int i;
>  	int ret;
>  
> +	ret = regulator_enable(pmic_typec_pdphy->vdd_pdphy);
> +	if (ret)
> +		return ret;
> +
>  	pmic_typec_pdphy->tcpm_port = tcpm_port;
>  
>  	ret = pmic_typec_pdphy_reset(pmic_typec_pdphy);
> @@ -467,6 +465,8 @@ void qcom_pmic_typec_pdphy_stop(struct pmic_typec_pdphy *pmic_typec_pdphy)
>  		disable_irq(pmic_typec_pdphy->irq_data[i].irq);
>  
>  	qcom_pmic_typec_pdphy_reset_on(pmic_typec_pdphy);
> +
> +	regulator_disable(pmic_typec_pdphy->vdd_pdphy);
>  }
>  
>  struct pmic_typec_pdphy *qcom_pmic_typec_pdphy_alloc(struct device *dev)
> 
> ---
> base-commit: bbb9e06d2c6435af9c62074ad7048910eeb2e7bc
> change-id: 20230822-qcom-tcpc-d41954ac65fa
> 
> Best regards,
> -- 
> Hui Liu <quic_huliu@...cinc.com>

-- 
heikki