[PATCH V2] usb: ehci-mx6: Enable OTG detection on imx8mm and imx8mn

[Adam Ford]

The imx8mm and imx8mn appear compatible with imx7d-usb
flags in the OTG driver.  If the dr_mode is defined as
host or peripheral, the device appears to operate correctly,
however the auto host/peripheral detection results in an error.

The solution isn't just adding checks for imx8mm and imx8mn to
the check for imx7, because the USB clock needs to be running
to read from the USBNC_PHY_STATUS_OFFSET register or it will hang.

The init_type in both priv and plat data are the same, so it doesn't
make sense to configure the data in the plat data and copy the
data to priv when priv can be configured directly.  Instead, rename
ehci_usb_of_to_plat to ehci_usb_dr_mode and call it from the
probe functions after the clocks are enabled, but before the data
is required.

With that added, the additional checks for imx8mm and imx8mn will
allow reading the register to automatically determine the state
(host or device) of the OTG controller.

Signed-off-by: Adam Ford <aford173 at gmail.com>
---
V2:  Rename ehci_usb_of_to_plat to ehci_usb_dr_mode and call it
     from the probe after the clocks are enabled, but before
     the data is needed.

diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
index 1bd6147c76..f2a34b7f06 100644
--- a/drivers/usb/host/ehci-mx6.c
+++ b/drivers/usb/host/ehci-mx6.c
@@ -513,7 +513,7 @@ static const struct ehci_ops mx6_ehci_ops = {
 
 static int ehci_usb_phy_mode(struct udevice *dev)
 {
-	struct usb_plat *plat = dev_get_plat(dev);
+	struct ehci_mx6_priv_data *priv = dev_get_priv(dev);
 	void *__iomem addr = dev_read_addr_ptr(dev);
 	void *__iomem phy_ctrl, *__iomem phy_status;
 	const void *blob = gd->fdt_blob;
@@ -540,18 +540,18 @@ static int ehci_usb_phy_mode(struct udevice *dev)
 		val = readl(phy_ctrl);
 
 		if (val & USBPHY_CTRL_OTG_ID)
-			plat->init_type = USB_INIT_DEVICE;
+			priv->init_type = USB_INIT_DEVICE;
 		else
-			plat->init_type = USB_INIT_HOST;
-	} else if (is_mx7()) {
+			priv->init_type = USB_INIT_HOST;
+	} else if (is_mx7() || is_imx8mm() || is_imx8mn()) {
 		phy_status = (void __iomem *)(addr +
 					      USBNC_PHY_STATUS_OFFSET);
 		val = readl(phy_status);
 
 		if (val & USBNC_PHYSTATUS_ID_DIG)
-			plat->init_type = USB_INIT_DEVICE;
+			priv->init_type = USB_INIT_DEVICE;
 		else
-			plat->init_type = USB_INIT_HOST;
+			priv->init_type = USB_INIT_HOST;
 	} else {
 		return -EINVAL;
 	}
@@ -559,19 +559,19 @@ static int ehci_usb_phy_mode(struct udevice *dev)
 	return 0;
 }
 
-static int ehci_usb_of_to_plat(struct udevice *dev)
+static int ehci_usb_dr_mode(struct udevice *dev)
 {
-	struct usb_plat *plat = dev_get_plat(dev);
+	struct ehci_mx6_priv_data *priv = dev_get_priv(dev);
 	enum usb_dr_mode dr_mode;
 
 	dr_mode = usb_get_dr_mode(dev_ofnode(dev));
 
 	switch (dr_mode) {
 	case USB_DR_MODE_HOST:
-		plat->init_type = USB_INIT_HOST;
+		priv->init_type = USB_INIT_HOST;
 		break;
 	case USB_DR_MODE_PERIPHERAL:
-		plat->init_type = USB_INIT_DEVICE;
+		priv->init_type = USB_INIT_DEVICE;
 		break;
 	case USB_DR_MODE_OTG:
 	case USB_DR_MODE_UNKNOWN:
@@ -639,10 +639,8 @@ static int mx6_parse_dt_addrs(struct udevice *dev)
 
 static int ehci_usb_probe(struct udevice *dev)
 {
-	struct usb_plat *plat = dev_get_plat(dev);
 	struct usb_ehci *ehci = dev_read_addr_ptr(dev);
 	struct ehci_mx6_priv_data *priv = dev_get_priv(dev);
-	enum usb_init_type type = plat->init_type;
 	struct ehci_hccr *hccr;
 	struct ehci_hcor *hcor;
 	int ret;
@@ -660,8 +658,6 @@ static int ehci_usb_probe(struct udevice *dev)
 		return ret;
 
 	priv->ehci = ehci;
-	priv->init_type = type;
-	priv->phy_type = usb_get_phy_mode(dev_ofnode(dev));
 
 #if CONFIG_IS_ENABLED(CLK)
 	ret = clk_get_by_index(dev, 0, &priv->clk);
@@ -677,6 +673,11 @@ static int ehci_usb_probe(struct udevice *dev)
 	mdelay(1);
 #endif
 
+	ret = ehci_usb_dr_mode(dev);
+	if (ret)
+		goto err_clk;
+	priv->phy_type = usb_get_phy_mode(dev_ofnode(dev));
+
 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 	ret = device_get_supply_regulator(dev, "vbus-supply",
 					  &priv->vbus_supply);
@@ -700,7 +701,7 @@ static int ehci_usb_probe(struct udevice *dev)
 #if CONFIG_IS_ENABLED(DM_REGULATOR)
 	if (priv->vbus_supply) {
 		ret = regulator_set_enable(priv->vbus_supply,
-					   (type == USB_INIT_DEVICE) ?
+					   (priv->init_type == USB_INIT_DEVICE) ?
 					   false : true);
 		if (ret && ret != -ENOSYS) {
 			printf("Error enabling VBUS supply (ret=%i)\n", ret);
@@ -785,11 +786,9 @@ U_BOOT_DRIVER(usb_mx6) = {
 	.name	= "ehci_mx6",
 	.id	= UCLASS_USB,
 	.of_match = mx6_usb_ids,
-	.of_to_plat = ehci_usb_of_to_plat,
 	.probe	= ehci_usb_probe,
 	.remove = ehci_usb_remove,
 	.ops	= &ehci_usb_ops,
-	.plat_auto	= sizeof(struct usb_plat),
 	.priv_auto	= sizeof(struct ehci_mx6_priv_data),
 	.flags	= DM_FLAG_ALLOC_PRIV_DMA,
 };
-- 
2.32.0