usb: dwc3: gadget: conditionally disable Link State change events

Link State Change events are only needed for
debugging and to apply certain workarounds on known
errata. Let's save a few cycles by disabling these
events completely on working revisions of the core.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 99ad3ca..ee94942 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1537,11 +1537,13 @@ static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
                        DWC3_DEVTEN_CMDCMPLTEN |
                        DWC3_DEVTEN_ERRTICERREN |
                        DWC3_DEVTEN_WKUPEVTEN |
-                       DWC3_DEVTEN_ULSTCNGEN |
                        DWC3_DEVTEN_CONNECTDONEEN |
                        DWC3_DEVTEN_USBRSTEN |
                        DWC3_DEVTEN_DISCONNEVTEN);
 
+       if (dwc->revision < DWC3_REVISION_250A)
+               reg |= DWC3_DEVTEN_ULSTCNGEN;
+
        dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
 }