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 <ba...@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
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