usb: phy: omap_usb_phy: implement usb_phy_power() for AM437x
Newer AM437x silicon requires us to explicitly power up
the USB2 PHY. By implementing usb_phy_power() we can
achieve that.
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/phy/omap_usb_phy.c b/drivers/usb/phy/omap_usb_phy.c
index af46db2..f78d532 100644
--- a/drivers/usb/phy/omap_usb_phy.c
+++ b/drivers/usb/phy/omap_usb_phy.c
@@ -222,7 +222,22 @@
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 */