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Commit 583b9be1 authored by Mayank Rana's avatar Mayank Rana Committed by Sriharsha Allenki
Browse files

usb: phy: qusb: Use scm call to update LVL_SHIFTER register 



TCSR_QUSB2PHY_CX2PX_LVL_SHIFT_KEEPER register is required to updated
to clamp level shifter with QUSB PHY. On some platforms, this register
is secured. Hence add functionality to perform secure write to this
register using scm call.

Change-Id: I7bc9d0cc54057eb95f533025b9f5dc50a6841e3b
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent 0a56af85

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

+29 −13
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#include <linux/usb/phy.h>

#include <linux/usb/msm_hsusb.h>



#include <soc/qcom/scm.h>



/* TCSR_PHY_CLK_SCHEME_SEL bit mask */

#define PHY_CLK_SCHEME_SEL BIT(0)
@@ -112,6 +114,8 @@ 


#define QUSB2PHY_REFCLK_ENABLE		BIT(0)



#define QUSB2PHY_LVL_SHIFTER_CMD_ID	0x1B



unsigned int tune2;

module_param(tune2, uint, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(tune2, "QUSB PHY TUNE2");
@@ -164,8 +168,26 @@ struct qusb_phy { 
	int			emu_dcm_reset_seq_len;

	spinlock_t		pulse_lock;

	bool			put_into_high_z_state;

	bool			scm_lvl_shifter_update;

};



static void qusb_phy_update_tcsr_level_shifter(struct qusb_phy *qphy, u32 val)

{

	int scm_ret, resp_ret;



	dev_dbg(qphy->phy.dev, "%s(): update tcsr lvl shift value:%d\n",

				__func__, val);

	if (qphy->tcsr_phy_lvl_shift_keeper)

		writel_relaxed(val, qphy->tcsr_phy_lvl_shift_keeper);



	else if (qphy->scm_lvl_shifter_update) {

		scm_ret = scm_call(SCM_SVC_BOOT, QUSB2PHY_LVL_SHIFTER_CMD_ID,

			&val, sizeof(val), &resp_ret, sizeof(resp_ret));

		dev_dbg(qphy->phy.dev, "%s(): scm_ret:%d resp_ret:%d\n",

				__func__, scm_ret, resp_ret);

	}

}



static void qusb_phy_enable_clocks(struct qusb_phy *qphy, bool on)

{

	dev_dbg(qphy->phy.dev, "%s(): clocks_enabled:%d on:%d\n",
@@ -409,10 +431,7 @@ static int qusb_phy_update_dpdm(struct usb_phy *phy, int value) 
			}



			if (qphy->put_into_high_z_state) {

				if (qphy->tcsr_phy_lvl_shift_keeper)

					writel_relaxed(0x1,

					       qphy->tcsr_phy_lvl_shift_keeper);



				qusb_phy_update_tcsr_level_shifter(qphy, 0x1);

				qusb_phy_gdsc(qphy, true);

				qusb_phy_enable_clocks(qphy, true);
@@ -484,9 +503,7 @@ static int qusb_phy_update_dpdm(struct usb_phy *phy, int value) 
			}



			if (!qphy->cable_connected) {

				if (qphy->tcsr_phy_lvl_shift_keeper)

					writel_relaxed(0x0,

					       qphy->tcsr_phy_lvl_shift_keeper);

				qusb_phy_update_tcsr_level_shifter(qphy, 0x0);

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

				ret = qusb_phy_enable_power(qphy, false);

			}
@@ -1015,9 +1032,7 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend) 
			wmb();



			qusb_phy_enable_clocks(qphy, false);

			if (qphy->tcsr_phy_lvl_shift_keeper)

				writel_relaxed(0x0,

					qphy->tcsr_phy_lvl_shift_keeper);

			qusb_phy_update_tcsr_level_shifter(qphy, 0x0);

			/* Do not disable power rails if there is vote for it */

			if (!qphy->rm_pulldown)

				qusb_phy_enable_power(qphy, false);
@@ -1044,9 +1059,7 @@ 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_phy_lvl_shift_keeper)

				writel_relaxed(0x1,

					qphy->tcsr_phy_lvl_shift_keeper);

			qusb_phy_update_tcsr_level_shifter(qphy, 0x1);

			qusb_phy_enable_clocks(qphy, true);

		}

		qphy->suspended = false;
@@ -1165,6 +1178,9 @@ static int qusb_phy_probe(struct platform_device *pdev) 
		}

	}



	qphy->scm_lvl_shifter_update = of_property_read_bool(dev->of_node,

					"qcom,secure-level-shifter-update");



	qphy->dpdm_pulsing_enabled = of_property_read_bool(dev->of_node,

					"qcom,enable-dpdm-pulsing");