[U-Boot] [PATCH 2/2] usb: phy: omap_usb_phy: implement usb_phy_power() for AM437x

[Felipe Balbi <balbi@ti.com>]

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>
---
 drivers/usb/phy/omap_usb_phy.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/phy/omap_usb_phy.c b/drivers/usb/phy/omap_usb_phy.c
index af46db2..0ed3e70 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(0x44e10628);
+	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 &= ~0x3;
+	} else {
+		val |= 0x3;
+	}
+
+	writel(val, 0x44e10628);
 }
 #endif /* CONFIG_AM437X_USB2PHY2_HOST */
 
-- 
2.0.0.390.gcb682f8