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: Peter Chen <peter.chen@nxp.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 322e4de6b24a..6d8331e7da99 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -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);