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Commit 94bd0759 authored by Chandana Kishori Chiluveru's avatar Chandana Kishori Chiluveru Committed by Gerrit - the friendly Code Review server
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QUSB2PHY: Fix leakage current issue during wall charger disconnect 



It is required to disable QUSB2PHY level shifter by writing to
TCSR_QUSB2PHY_CX2PX_LVL_SHIFT_KEEPER register during disconnect
to avoid leakage current. Hence add support for the same.

Change-Id: I666617d513314903533f2356b5db4b9ca3eac6e4
Signed-off-by: default avatarVijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent d5954b91

Documentation/devicetree/bindings/usb/msm-phy.txt

+3 −0
Original line number Diff line number Diff line
@@ -160,6 +160,9 @@ Optional properties: 
   "efuse_addr": EFUSE address to read and update analog tune parameter.

   "emu_phy_base" : phy base address used for programming emulation target phy.

   "ref_clk_addr" : ref_clk bcr address used for on/off ref_clk before reset.

   "tcsr_clamp_dig_n" : To enable/disable digital clamp to the phy. When

   de-asserted, it will prevent random leakage from qusb2 phy resulting from

   out of sequence turn on/off of 1p8, 3p3 and DVDD regulators.

   "refgen_north_bg_reg" : address used to read REFGEN status for overriding QUSB PHY register.

 - clocks: a list of phandles to the PHY clocks. Use as per

   Documentation/devicetree/bindings/clock/clock-bindings.txt

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

+25 −0
Original line number Diff line number Diff line
@@ -103,6 +103,7 @@ struct qusb_phy { 
	void __iomem		*base;

	void __iomem		*tune2_efuse_reg;

	void __iomem		*ref_clk_base;

	void __iomem		*tcsr_clamp_dig_n;



	struct clk		*ref_clk_src;

	struct clk		*ref_clk;
@@ -652,6 +653,9 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend) 
			wmb();



			qusb_phy_enable_clocks(qphy, false);

			if (qphy->tcsr_clamp_dig_n)

				writel_relaxed(0x0,

					qphy->tcsr_clamp_dig_n);

			qusb_phy_enable_power(qphy, false);



			/*
@@ -674,6 +678,9 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend) 
				qphy->base + QUSB2PHY_PORT_INTR_CTRL);

		} else {

			qusb_phy_enable_power(qphy, true);

			if (qphy->tcsr_clamp_dig_n)

				writel_relaxed(0x1,

					qphy->tcsr_clamp_dig_n);

			qusb_phy_enable_clocks(qphy, true);

		}

		qphy->suspended = false;
@@ -723,6 +730,10 @@ static int qusb_phy_dpdm_regulator_enable(struct regulator_dev *rdev) 
		}

		qphy->dpdm_enable = true;

		if (qphy->put_into_high_z_state) {

			if (qphy->tcsr_clamp_dig_n)

				writel_relaxed(0x1,

				qphy->tcsr_clamp_dig_n);



			qusb_phy_gdsc(qphy, true);

			qusb_phy_enable_clocks(qphy, true);
@@ -776,6 +787,9 @@ static int qusb_phy_dpdm_regulator_disable(struct regulator_dev *rdev) 


	if (qphy->dpdm_enable) {

		if (!qphy->cable_connected) {

			if (qphy->tcsr_clamp_dig_n)

				writel_relaxed(0x0,

					qphy->tcsr_clamp_dig_n);

			dev_dbg(qphy->phy.dev, "turn off for HVDCP case\n");

			ret = qusb_phy_enable_power(qphy, false);

			if (ret < 0) {
@@ -916,6 +930,17 @@ static int qusb_phy_probe(struct platform_device *pdev) 
		}

	}



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,

						"tcsr_clamp_dig_n_1p8");

	if (res) {

		qphy->tcsr_clamp_dig_n = devm_ioremap_nocache(dev,

				res->start, resource_size(res));

		if (IS_ERR(qphy->tcsr_clamp_dig_n)) {

			dev_err(dev, "err reading tcsr_clamp_dig_n\n");

			qphy->tcsr_clamp_dig_n = NULL;

		}

	}



	qphy->ref_clk_src = devm_clk_get(dev, "ref_clk_src");

	if (IS_ERR(qphy->ref_clk_src))

		dev_dbg(dev, "clk get failed for ref_clk_src\n");