linux-kernel - [PATCH v2 03/17] phy: qcom-qmp: Power-on PHY before initialization

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Message-Id: <1506502753-27408-4-git-send-email-mgautam@codeaurora.org>
Date:   Wed, 27 Sep 2017 14:28:59 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Felipe Balbi <balbi@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, Manu Gautam <mgautam@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Varadarajan Narayanan <varada@...eaurora.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        linux-kernel@...r.kernel.org (open list:GENERIC PHY FRAMEWORK)
Subject: [PATCH v2 03/17] phy: qcom-qmp: Power-on PHY before initialization

PHY must be powered on before turning ON clocks and
attempting to initialize it. Driver is exposing
separate init and power_on routines for this.
Apparently USB dwc3 core driver performs power-on after
init. Also, poweron and init for QMP PHY need to be
executed together always, hence remove poweron callback
from phy_ops and explicitly perform this from com_init,
similar changes needed for poweroff. On similar lines move
clk_enable from init to com_init which can be called once
for multi lane PHYs.

Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 61 +++++++++++++------------------------
 1 file changed, 21 insertions(+), 40 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 90794dd..2f427e3 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -720,33 +720,6 @@ static void qcom_qmp_phy_configure(void __iomem *base,
 	}
 }
 
-static int qcom_qmp_phy_poweron(struct phy *phy)
-{
-	struct qmp_phy *qphy = phy_get_drvdata(phy);
-	struct qcom_qmp *qmp = qphy->qmp;
-	int num = qmp->cfg->num_vregs;
-	int ret;
-
-	dev_vdbg(&phy->dev, "Powering on QMP phy\n");
-
-	/* turn on regulator supplies */
-	ret = regulator_bulk_enable(num, qmp->vregs);
-	if (ret)
-		dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
-
-	return ret;
-}
-
-static int qcom_qmp_phy_poweroff(struct phy *phy)
-{
-	struct qmp_phy *qphy = phy_get_drvdata(phy);
-	struct qcom_qmp *qmp = qphy->qmp;
-
-	regulator_bulk_disable(qmp->cfg->num_vregs, qmp->vregs);
-
-	return 0;
-}
-
 static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
 {
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
@@ -759,6 +732,19 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
 		return 0;
 	}
 
+	/* turn on regulator supplies */
+	ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
+	if (ret) {
+		mutex_unlock(&qmp->phy_mutex);
+		return ret;
+	}
+
+	ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks);
+	if (ret) {
+		dev_err(qmp->dev, "failed to enable clks, err=%d\n", ret);
+		goto err_clk_enable;
+	}
+
 	for (i = 0; i < cfg->num_resets; i++) {
 		ret = reset_control_deassert(qmp->resets[i]);
 		if (ret) {
@@ -803,6 +789,9 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
 err_rst:
 	while (--i >= 0)
 		reset_control_assert(qmp->resets[i]);
+	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
+err_clk_enable:
+	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
 	mutex_unlock(&qmp->phy_mutex);
 
 	return ret;
@@ -832,6 +821,10 @@ static int qcom_qmp_phy_com_exit(struct qcom_qmp *qmp)
 	while (--i >= 0)
 		reset_control_assert(qmp->resets[i]);
 
+	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
+
+	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
+
 	mutex_unlock(&qmp->phy_mutex);
 
 	return 0;
@@ -852,15 +845,9 @@ static int qcom_qmp_phy_init(struct phy *phy)
 
 	dev_vdbg(qmp->dev, "Initializing QMP phy\n");
 
-	ret = clk_bulk_prepare_enable(cfg->num_clks, qmp->clks);
-	if (ret) {
-		dev_err(qmp->dev, "failed to enable clks, err=%d\n", ret);
-		return ret;
-	}
-
 	ret = qcom_qmp_phy_com_init(qmp);
 	if (ret)
-		goto err_com_init;
+		return ret;
 
 	if (cfg->has_lane_rst) {
 		ret = reset_control_deassert(qphy->lane_rst);
@@ -915,8 +902,6 @@ static int qcom_qmp_phy_init(struct phy *phy)
 		reset_control_assert(qphy->lane_rst);
 err_lane_rst:
 	qcom_qmp_phy_com_exit(qmp);
-err_com_init:
-	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
 
 	return ret;
 }
@@ -943,8 +928,6 @@ static int qcom_qmp_phy_exit(struct phy *phy)
 
 	qcom_qmp_phy_com_exit(qmp);
 
-	clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks);
-
 	return 0;
 }
 
@@ -1057,8 +1040,6 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, struct device_node *np)
 static const struct phy_ops qcom_qmp_phy_gen_ops = {
 	.init		= qcom_qmp_phy_init,
 	.exit		= qcom_qmp_phy_exit,
-	.power_on	= qcom_qmp_phy_poweron,
-	.power_off	= qcom_qmp_phy_poweroff,
 	.owner		= THIS_MODULE,
 };
 
-- 
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