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authorFelipe Balbi <balbi@ti.com>2014-06-23 17:18:24 -0500
committerMarek Vasut <marex@denx.de>2014-07-09 22:11:51 +0200
commit5ba95541b700d2edecb4d97d4b905f51ed8551b3 (patch)
tree26c9d9f31c03ce6815b63ef152d026a895907004 /drivers
parent26707d9e6bb0d2e5e6de706cd68bddcea34e731f (diff)
downloadtalos-obmc-uboot-5ba95541b700d2edecb4d97d4b905f51ed8551b3.tar.gz
talos-obmc-uboot-5ba95541b700d2edecb4d97d4b905f51ed8551b3.zip
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>
Diffstat (limited to 'drivers')
-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 */
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