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>
---
arch/arm/include/asm/arch-am33xx/hardware_am43xx.h | 5 +++++
drivers/usb/phy/omap_usb_phy.c | 11 ++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
index b470319..efdecf4 100644
--- a/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
+++ b/arch/arm/include/asm/arch-am33xx/hardware_am43xx.h
@@ -43,6 +43,11 @@
#define VTP0_CTRL_ADDR 0x44E10E0C
#define VTP1_CTRL_ADDR 0x48140E10
+/* USB CTRL Base Address */
+#define USB1_CTRL 0x44e10628
+#define USB1_CTRL_CM_PWRDN BIT(0)
+#define USB1_CTRL_OTG_PWRDN BIT(1)
+
/* DDR Base address */
#define DDR_PHY_CMD_ADDR 0x44E12000
#define DDR_PHY_DATA_ADDR 0x44E120C8
diff --git a/drivers/usb/phy/omap_usb_phy.c b/drivers/usb/phy/omap_usb_phy.c
index af46db2..53778b3 100644
--- a/drivers/usb/phy/omap_usb_phy.c
+++ b/drivers/usb/phy/omap_usb_phy.c
@@ -222,7 +222,16 @@ static void am437x_enable_usb2_phy2(struct omap_xhci *omap)
void usb_phy_power(int on)
{
- return;
+ /*
+ * In order to get USB working on newer AM43xx silicon, we must
+ * explicitly power the USB PHYs.
+ */
+ if (on)
+ clrbits_le32(USB1_CTRL, USB1_CTRL_CM_PWRDN |
+ USB1_CTRL_OTG_PWRDN);
+ else
+ setbits_le32(USB1_CTRL, USB1_CTRL_CM_PWRDN |
+ USB1_CTRL_OTG_PWRDN);
}
#endif /* CONFIG_AM437X_USB2PHY2_HOST */
--
2.0.0.390.gcb682f8
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