usb: dwc3: Fall back to high speed when SSPHY fails

In some cases, it has been observed that SSPHY fails to initialized.
This change detects this condition and configures controller to work
into high speed mode only.

Change-Id: I50c4041d8572d0cdc4535812eebd10fc18b78e98
Signed-off-by: Mayank Rana <mrana@codeaurora.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 6ae3202..5fa3423 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -107,8 +107,15 @@ static int dwc3_init_usb_phys(struct dwc3 *dwc)
                                __func__, ret);
                return ret;
        }
+
        ret = usb_phy_init(dwc->usb3_phy);
-       if (ret) {
+       if (ret == -EBUSY) {
+               /*
+                * Setting Max speed as high when USB3 PHY initialiation
+                * is failing and USB superspeed can't be supported.
+                */
+               dwc->maximum_speed = USB_SPEED_HIGH;
+       } else if (ret) {
                pr_err("%s: usb_phy_init(dwc->usb3_phy) returned %d\n",
                                __func__, ret);
                return ret;