phy: omap-usb2: Provide workaround for USB2PHY false disconnect

Enable the dra7x errata workaround for false disconnect problem
with USB2PHY. False disconnects were detected with some of the devices.
Reduce the sensitivity of the disconnect logic within the USB2PHY subsystem
to enusre these false disconnects are not registered.

[george.cherian@ti.com]
While at that, pass proper flags for each SoC's. This is a common driver
used across OMAP4,OMAP5,DRA7xx and AM437x USB2PHY.

False disconnect workaround is currently applicable for only DRA7x.

Signed-off-by: Austin Beam <austinbeam@ti.com>
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 0c78f54..b220202 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -31,6 +31,9 @@
 #include <linux/phy/phy.h>
 #include <linux/of_platform.h>
 
+#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
+#define USB2PHY_ANA_CONFIG1 0x4c
+
 /**
  * omap_usb2_set_comparator - links the comparator present in the sytem with
  *	this phy
@@ -116,7 +119,30 @@ static int omap_usb_power_on(struct phy *x)
 	return 0;
 }
 
+static int omap_usb_init(struct phy *x)
+{
+	struct omap_usb *phy = phy_get_drvdata(x);
+	u32 val;
+
+	if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
+		/*
+		 *
+		 * Reduce the sensitivity of internal PHY by enabling the
+		 * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
+		 * resolves issues with certain devices which can otherwise
+		 * be prone to false disconnects.
+		 *
+		 */
+		val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
+		val |= USB2PHY_DISCON_BYP_LATCH;
+		omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
+	}
+
+	return 0;
+}
+
 static struct phy_ops ops = {
+	.init		= omap_usb_init,
 	.power_on	= omap_usb_power_on,
 	.power_off	= omap_usb_power_off,
 	.owner		= THIS_MODULE,
@@ -128,6 +154,11 @@ static const struct usb_phy_data omap_usb2_data = {
 	.flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 };
 
+static const struct usb_phy_data dra7x_usb2_data = {
+	.label = "dra7x_usb2",
+	.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
+};
+
 static const struct usb_phy_data am437x_usb2_data = {
 	.label = "am437x_usb2",
 	.flags =  0,
@@ -139,6 +170,10 @@ static const struct of_device_id omap_usb2_id_table[] = {
 		.data = &omap_usb2_data,
 	},
 	{
+		.compatible = "ti,dra7x-usb2",
+		.data = &dra7x_usb2_data,
+	},
+	{
 		.compatible = "ti,am437x-usb2",
 		.data = &am437x_usb2_data,
 	},
@@ -151,6 +186,7 @@ static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb	*phy;
 	struct phy *generic_phy;
+	struct resource *res;
 	struct phy_provider *phy_provider;
 	struct usb_otg *otg;
 	struct device_node *node = pdev->dev.of_node;
@@ -185,6 +221,14 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	phy->phy.otg		= otg;
 	phy->phy.type		= USB_PHY_TYPE_USB2;
 
+	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
+		if (!phy->phy_base)
+			return -ENOMEM;
+		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
+	}
+
 	control_node = of_parse_phandle(node, "ctrl-module", 0);
 	if (!control_node) {
 		dev_err(&pdev->dev, "Failed to get control device phandle\n");