usb: xhci-exynos5: Disable USB 3.0 port for host mode

xhci driver have not been completely implemented, so the controller
cannot recognize the USB 3.0 device when it is connected to xhci-hosted
port. This patch disable USB 3.0 port of xhci host, then super-speed
devices can be recognized as at least high-speed devices.

Change-Id: I6100f6c441993ae882db371d880a457cdcde4ae5
Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

diff --git a/arch/arm/mach-exynos/include/mach/xhci-exynos.h b/arch/arm/mach-exynos/include/mach/xhci-exynos.h
index 403b1e1..add8a80 100644 (file)
--- a/arch/arm/mach-exynos/include/mach/xhci-exynos.h
+++ b/arch/arm/mach-exynos/include/mach/xhci-exynos.h
@@ -62,6 +62,10 @@
 
 #define PHYBATCHG_UTMI_CLKSEL                  (0x1 << 2)
 
+
+#define LINK_PORT_HOST_U3_PORT_DISABLE         (0x1 << 8)
+#define LINK_PORT_HOST_U2_PORT_DISABLE         (0x1 << 7)
+
 #define FSEL_CLKSEL_24M                                (0x5)
 
 /* XHCI PHY register structure */

diff --git a/drivers/usb/host/xhci-exynos5.c b/drivers/usb/host/xhci-exynos5.c
index 6fb7a7f..2979a96 100644 (file)
--- a/drivers/usb/host/xhci-exynos5.c
+++ b/drivers/usb/host/xhci-exynos5.c
@@ -112,6 +112,15 @@ static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
        writel(0x0, &phy->phy_resume);
 
        /*
+        * FIXME: If xhci becomes being able to fully support super-speed
+        * devices, this should be reverted.
+        *
+        * Disable USB 3.0 port and enable USB 2.0 port only
+        */
+       clrbits_le32(&phy->link_port, LINK_PORT_HOST_U2_PORT_DISABLE);
+       setbits_le32(&phy->link_port, LINK_PORT_HOST_U3_PORT_DISABLE);
+
+       /*
         * Setting the Frame length Adj value[6:1] to default 0x20
         * See xHCI 1.0 spec, 5.2.4
         */