linux-kernel - [PATCH v3] usb: typec: qcom: check regulator enable status before disabling it

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Message-Id: <20230828-qcom-tcpc-v3-1-e95b7afa34d9@quicinc.com>
Date:   Mon, 28 Aug 2023 13:16:30 +0800
From:   Hui Liu via B4 Relay <devnull+quic_huliu.quicinc.com@...nel.org>
To:     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>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_fenglinw@...cinc.com,
        subbaram@...cinc.com, Hui Liu <quic_huliu@...cinc.com>
Subject: [PATCH v3] usb: typec: qcom: check regulator enable status before
 disabling it

From: Hui Liu <quic_huliu@...cinc.com>

Check regulator enable status before disabling it to avoid
unbalanced regulator disable warnings.

Reviewed-by: Guenter Roeck <linux@...ck-us.net>
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>
Signed-off-by: Hui Liu <quic_huliu@...cinc.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>