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path: root/drivers/phy/phy-omap-usb2.c
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Diffstat (limited to 'drivers/phy/phy-omap-usb2.c')
-rw-r--r--drivers/phy/phy-omap-usb2.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 0c78f54d0650..b220202a3f30 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");