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Commit cd3fb8ae authored by Pratham Pratap's avatar Pratham Pratap
Browse files

usb: phy: qusb2: Add regulator support which powers refgen 



Since QUSB2PHY take biases from REFGEN it is necessary to
power refgen for QUSB2PHY to operate. This change adds regulator
support which powers the refgen. The regulator handle needs to be
passed from device tree.

Change-Id: Icd17252103d5fbc90416020ba452f303c01f1f65
Signed-off-by: default avatarPratham Pratap <prathampratap@codeaurora.org>
parent 74de7711

drivers/usb/phy/phy-msm-qusb-v2.c

+92 −17
Original line number Diff line number Diff line
@@ -54,6 +54,10 @@ 
#define QUSB2PHY_3P3_VOL_MAX		3200000 /* uV */

#define QUSB2PHY_3P3_HPM_LOAD		30000	/* uA */



#define QUSB2PHY_REFGEN_VOL_MIN		1200000 /* uV */

#define QUSB2PHY_REFGEN_VOL_MAX		1200000 /* uV */

#define QUSB2PHY_REFGEN_HPM_LOAD	30000	/* uA */



#define LINESTATE_DP			BIT(0)

#define LINESTATE_DM			BIT(1)
@@ -106,6 +110,7 @@ struct qusb_phy { 
	struct regulator	*vdd;

	struct regulator	*vdda33;

	struct regulator	*vdda18;

	struct regulator	*refgen;

	int			vdd_levels[3]; /* none, low, high */

	int			init_seq_len;

	int			*qusb_phy_init_seq;
@@ -193,6 +198,24 @@ static int qusb_phy_disable_power(struct qusb_phy *qphy) 
	dev_dbg(qphy->phy.dev, "%s:req to turn off regulators\n",

			__func__);



	ret = regulator_disable(qphy->refgen);

	if (ret)

		dev_err(qphy->phy.dev, "Unable to disable refgen:%d\n", ret);



	if (!regulator_is_enabled(qphy->refgen)) {

		ret = regulator_set_voltage(qphy->refgen, 0,

					QUSB2PHY_REFGEN_VOL_MAX);

		if (ret)

			dev_err(qphy->phy.dev,

				"Unable to set (0) voltage for refgen:%d\n",

					ret);



		ret = regulator_set_load(qphy->refgen, 0);

		if (ret < 0)

			dev_err(qphy->phy.dev,

					"Unable to set (0) HPM of refgen\n");

	}



	ret = regulator_disable(qphy->vdda33);

	if (ret)

		dev_err(qphy->phy.dev, "Unable to disable vdda33:%d\n", ret);
@@ -309,12 +332,47 @@ static int qusb_phy_enable_power(struct qusb_phy *qphy) 
		goto unset_vdd33;

	}



	ret = regulator_set_load(qphy->refgen, QUSB2PHY_REFGEN_HPM_LOAD);

	if (ret < 0) {

		dev_err(qphy->phy.dev, "Unable to set HPM of refgen:%d\n", ret);

		goto disable_vdd33;

	}



	ret = regulator_set_voltage(qphy->refgen, QUSB2PHY_REFGEN_VOL_MIN,

						QUSB2PHY_REFGEN_VOL_MAX);

	if (ret) {

		dev_err(qphy->phy.dev,

				"Unable to set voltage for refgen:%d\n", ret);

		goto put_refgen_lpm;

	}



	ret = regulator_enable(qphy->refgen);

	if (ret) {

		dev_err(qphy->phy.dev, "Unable to enable refgen\n");

		goto unset_refgen;

	}

	pr_debug("%s(): QUSB PHY's regulators are turned ON.\n", __func__);



	mutex_unlock(&qphy->lock);



	return ret;



unset_refgen:

	ret = regulator_set_voltage(qphy->refgen, 0, QUSB2PHY_REFGEN_VOL_MAX);

	if (ret)

		dev_err(qphy->phy.dev,

			"Unable to set (0) voltage for refgen:%d\n", ret);



put_refgen_lpm:

	ret = regulator_set_load(qphy->refgen, 0);

	if (ret < 0)

		dev_err(qphy->phy.dev, "Unable to set (0) HPM of refgen\n");



disable_vdd33:

	ret = regulator_disable(qphy->vdda33);

	if (ret)

		dev_err(qphy->phy.dev, "Unable to disable vdda33:%d\n", ret);



unset_vdd33:

	ret = regulator_set_voltage(qphy->vdda33, 0, QUSB2PHY_3P3_VOL_MAX);

	if (ret)
@@ -963,6 +1021,37 @@ static int qusb_phy_create_debugfs(struct qusb_phy *qphy) 
	return ret;

}



static int qusb2_get_regulators(struct qusb_phy *qphy)

{

	struct device *dev = qphy->phy.dev;



	qphy->vdd = devm_regulator_get(dev, "vdd");

	if (IS_ERR(qphy->vdd)) {

		dev_err(dev, "unable to get vdd supply\n");

		return PTR_ERR(qphy->vdd);

	}



	qphy->vdda33 = devm_regulator_get(dev, "vdda33");

	if (IS_ERR(qphy->vdda33)) {

		dev_err(dev, "unable to get vdda33 supply\n");

		return PTR_ERR(qphy->vdda33);

	}



	qphy->vdda18 = devm_regulator_get(dev, "vdda18");

	if (IS_ERR(qphy->vdda18)) {

		dev_err(dev, "unable to get vdda18 supply\n");

		return PTR_ERR(qphy->vdda18);

	}



	qphy->refgen = devm_regulator_get(dev, "refgen");

	if (IS_ERR(qphy->refgen)) {

		dev_err(dev, "unable to get refgen supply\n");

		return PTR_ERR(qphy->refgen);

	}



	return 0;

}



static int qusb_phy_probe(struct platform_device *pdev)

{

	struct qusb_phy *qphy;
@@ -1216,23 +1305,9 @@ static int qusb_phy_probe(struct platform_device *pdev) 
		return ret;

	}



	qphy->vdd = devm_regulator_get(dev, "vdd");

	if (IS_ERR(qphy->vdd)) {

		dev_err(dev, "unable to get vdd supply\n");

		return PTR_ERR(qphy->vdd);

	}



	qphy->vdda33 = devm_regulator_get(dev, "vdda33");

	if (IS_ERR(qphy->vdda33)) {

		dev_err(dev, "unable to get vdda33 supply\n");

		return PTR_ERR(qphy->vdda33);

	}



	qphy->vdda18 = devm_regulator_get(dev, "vdda18");

	if (IS_ERR(qphy->vdda18)) {

		dev_err(dev, "unable to get vdda18 supply\n");

		return PTR_ERR(qphy->vdda18);

	}

	ret = qusb2_get_regulators(qphy);

	if (ret)

		return ret;



	mutex_init(&qphy->lock);

	platform_set_drvdata(pdev, qphy);