Unverified Commit 58a3cefb authored by Peter Chen's avatar Peter Chen
Browse files

usb: chipidea: imx: add two samsung picophy parameters tuning implementation 



These two parameters are used to improve USB signal for board level,
in this commit, we read it from the dtb, and write to related register
during the initialization.

Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
parent 8977c947

drivers/usb/chipidea/ci_hdrc_imx.c

+5 −0
Original line number Diff line number Diff line
@@ -165,6 +165,11 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev) 
	if (of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI)

		data->ulpi = 1;



	of_property_read_u32(np, "samsung,picophy-pre-emp-curr-control",

			&data->emp_curr_control);

	of_property_read_u32(np, "samsung,picophy-dc-vol-level-adjust",

			&data->dc_vol_level_adjust);



	return data;

}

drivers/usb/chipidea/ci_hdrc_imx.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ struct imx_usbmisc_data { 
	unsigned int ext_vbus:1; /* Vbus from exteranl event */

	struct usb_phy *usb_phy;

	enum usb_dr_mode available_role; /* runtime usb dr mode */

	int emp_curr_control;

	int dc_vol_level_adjust;

};



int imx_usbmisc_init(struct imx_usbmisc_data *data);

drivers/usb/chipidea/usbmisc_imx.c

+21 −0
Original line number Diff line number Diff line
@@ -128,6 +128,12 @@ 
#define MX7D_USB_OTG_PHY_STATUS_VBUS_VLD	BIT(3)

#define MX7D_USB_OTG_PHY_STATUS_CHRGDET		BIT(29)



#define MX7D_USB_OTG_PHY_CFG1		0x30

#define TXPREEMPAMPTUNE0_BIT		28

#define TXPREEMPAMPTUNE0_MASK		(3 << 28)

#define TXVREFTUNE0_BIT			20

#define TXVREFTUNE0_MASK		(0xf << 20)



#define MX6_USB_OTG_WAKEUP_BITS (MX6_BM_WAKEUP_ENABLE | MX6_BM_VBUS_WAKEUP | \

				 MX6_BM_ID_WAKEUP)
@@ -649,6 +655,21 @@ static int usbmisc_imx7d_init(struct imx_usbmisc_data *data) 
		writel(reg | MX7D_USB_VBUS_WAKEUP_SOURCE_BVALID

			| MX7D_USBNC_AUTO_RESUME,

			usbmisc->base + MX7D_USBNC_USB_CTRL2);

		/* PHY tuning for signal quality */

		reg = readl(usbmisc->base + MX7D_USB_OTG_PHY_CFG1);

		if (data->emp_curr_control && data->emp_curr_control <=

			(TXPREEMPAMPTUNE0_MASK >> TXPREEMPAMPTUNE0_BIT)) {

			reg &= ~TXPREEMPAMPTUNE0_MASK;

			reg |= (data->emp_curr_control << TXPREEMPAMPTUNE0_BIT);

		}



		if (data->dc_vol_level_adjust && data->dc_vol_level_adjust <=

			(TXVREFTUNE0_MASK >> TXVREFTUNE0_BIT)) {

			reg &= ~TXVREFTUNE0_MASK;

			reg |= (data->dc_vol_level_adjust << TXVREFTUNE0_BIT);

		}



		writel(reg, usbmisc->base + MX7D_USB_OTG_PHY_CFG1);

	}



	spin_unlock_irqrestore(&usbmisc->lock, flags);