diff options
Diffstat (limited to 'drivers/usb/phy/omap_usb_phy.c')
| -rw-r--r-- | drivers/usb/phy/omap_usb_phy.c | 17 |
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 */ |