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Commit bd92c12e authored by Mayank Rana's avatar Mayank Rana Committed by Azhar Shaikh
Browse files

usb: phy-msm-qusb: Support low power mode 



Enables support for low power mode for QUSB2 PHY.
Allows XO shutdown during bus suspend.

Change-Id: I5ee42112f7c63c957d00889acb26931d2b555f9e
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
Signed-off-by: default avatarAzhar Shaikh <azhars@codeaurora.org>
parent f1a9f6d4

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

+40 −17
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>

#include <linux/usb/phy.h>

#include <linux/usb/msm_hsusb.h>



#define QUSB2PHY_PORT_POWERDOWN		0xB4

#define CLAMP_N_EN			BIT(5)
@@ -34,6 +35,13 @@ 
#define QUSB2PHY_PORT_TUNE3             0x88

#define QUSB2PHY_PORT_TUNE4             0x8C



#define QUSB2PHY_PORT_INTR_CTRL         0xBC

#define CHG_DET_INTR_EN                 BIT(4)

#define DMSE_INTR_HIGH_SEL              BIT(3)

#define DMSE_INTR_EN                    BIT(2)

#define DPSE_INTR_HIGH_SEL              BIT(1)

#define DPSE_INTR_EN                    BIT(0)



#define UTMI_OTG_VBUS_VALID             BIT(20)

#define SW_SESSVLD_SEL                  BIT(28)
@@ -246,6 +254,7 @@ static void qusb_write_readback(void *base, u32 offset, 
static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend)

{

	struct qusb_phy *qphy = container_of(phy, struct qusb_phy, phy);

	u32 intr_mask = 0;



	if (!qphy->clocks_enabled) {

		dev_dbg(phy->dev, "clocks not enabled yet\n");
@@ -259,26 +268,44 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend) 
	}



	if (suspend) {

		/* Suspend case */

		if (qphy->cable_connected) {

			return -EAGAIN;

		/* Bus suspend case */

		if (qphy->cable_connected ||

			(qphy->phy.flags & PHY_HOST_MODE)) {

			/* Clear all interrupts */

			writel_relaxed(0x00,

				qphy->base + QUSB2PHY_PORT_INTR_CTRL);



			/* Enable D+ interrupt */

			intr_mask |= DPSE_INTR_EN;



			/* Select D+ falling edge as the trigger */

			intr_mask &= ~DPSE_INTR_HIGH_SEL;



			writel_relaxed(intr_mask,

				qphy->base + QUSB2PHY_PORT_INTR_CTRL);



			clk_disable_unprepare(qphy->cfg_ahb_clk);

			clk_disable_unprepare(qphy->ref_clk);

		} else { /* Disconnect case */

			/* Disable the PHY */

			writel_relaxed(CLAMP_N_EN | FREEZIO_N | POWER_DOWN,

				qphy->base + QUSB2PHY_PORT_POWERDOWN);

			clk_disable_unprepare(qphy->cfg_ahb_clk);

			clk_disable_unprepare(qphy->ref_clk);

			qusb_phy_enable_power(qphy, false);

		}

		qphy->suspended = true;

	} else {

		/* Bus suspend case */

		if (qphy->cable_connected ||

			(qphy->phy.flags & PHY_HOST_MODE)) {

			clk_prepare_enable(qphy->ref_clk);

			clk_prepare_enable(qphy->cfg_ahb_clk);

			/* Clear all interrupts on resume */

			writel_relaxed(0x00,

				qphy->base + QUSB2PHY_PORT_INTR_CTRL);

		} else {

			qusb_phy_enable_power(qphy, true);

			clk_prepare_enable(qphy->ref_clk);

			clk_prepare_enable(qphy->cfg_ahb_clk);

		/* Enable the PHY */

		writel_relaxed(CLAMP_N_EN | FREEZIO_N,

			qphy->base + QUSB2PHY_PORT_POWERDOWN);

		/* Caller needs to call qusb_phy_init to apply tuning params */

		}

		qphy->suspended = false;

	}
@@ -411,10 +438,6 @@ static int qusb_phy_probe(struct platform_device *pdev) 
	if (ret)

		return ret;



	clk_prepare_enable(qphy->ref_clk);

	clk_prepare_enable(qphy->cfg_ahb_clk);

	qphy->clocks_enabled = true;



	platform_set_drvdata(pdev, qphy);



	qphy->phy.label			= "msm-qusb-phy";