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path: root/drivers/usb/phy/omap_usb_phy.c
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Diffstat (limited to 'drivers/usb/phy/omap_usb_phy.c')
-rw-r--r--drivers/usb/phy/omap_usb_phy.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/usb/phy/omap_usb_phy.c b/drivers/usb/phy/omap_usb_phy.c
index af46db2edd..f78d532966 100644
--- a/drivers/usb/phy/omap_usb_phy.c
+++ b/drivers/usb/phy/omap_usb_phy.c
@@ -222,7 +222,22 @@ static void am437x_enable_usb2_phy2(struct omap_xhci *omap)
void usb_phy_power(int on)
{
- return;
+ u32 val;
+
+ /* USB1_CTRL */
+ val = readl(USB1_CTRL);
+ if (on) {
+ /*
+ * these bits are re-used on AM437x to power up/down the USB
+ * CM and OTG PHYs, if we don't toggle them, USB will not be
+ * functional on newer silicon revisions
+ */
+ val &= ~(USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN);
+ } else {
+ val |= USB1_CTRL_CM_PWRDN | USB1_CTRL_OTG_PWRDN;
+ }
+
+ writel(val, USB1_CTRL);
}
#endif /* CONFIG_AM437X_USB2PHY2_HOST */