usb: phy: mxs: add delay before set phyctrl.clkgate

There is a request from IC engineer that if we doesn't
set phypwd as 0xffffffff, we need to delay about five
32Khz cycles before set phy's pwd register, otherwise,
the wakeup signal may can't wake up controller.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index c3177a1..8f7cb06 100644 (file)
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -371,10 +371,16 @@ static int mxs_phy_suspend(struct usb_phy *x, int suspend)
                 * connect. The low speed connection will have problem at
                 * very rare cases during usb suspend and resume process.
                 */
-               if (low_speed_connection & vbus_is_on)
-                       writel(0xfffbffff, x->io_priv + HW_USBPHY_PWD);
-               else
+               if (low_speed_connection & vbus_is_on) {
+                       /*
+                        * If value to be set as pwd value is not 0xffffffff,
+                        * several 32Khz cycles are needed.
+                        */
+                       mxs_phy_clock_switch_delay();
+                       writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD);
+               } else {
                        writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
+               }
                writel(BM_USBPHY_CTRL_CLKGATE,
                       x->io_priv + HW_USBPHY_CTRL_SET);
                clk_disable_unprepare(mxs_phy->clk);