usb: dwc3: Add ENDXFER command polling
ENDXFER polling is available on version 3.10a and later of the
DWC_usb3 (USB 3.0) controller. With this feature, the software can poll
the CMDACT bit in the DEPCMD register after issuing an ENDXFER command.
This feature is enabled by writing GUCTL2[14].
This feature is NOT available on the DWC_usb31 (USB 3.1) IP.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 25e424e..d6d3fa0 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -704,6 +704,17 @@
break;
}
+ /*
+ * ENDXFER polling is available on version 3.10a and later of
+ * the DWC_usb3 controller. It is NOT available in the
+ * DWC_usb31 controller.
+ */
+ if (!dwc3_is_usb31(dwc) && dwc->revision >= DWC3_REVISION_310A) {
+ reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
+ reg |= DWC3_GUCTL2_RST_ACTBITLATER;
+ dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
+ }
+
return 0;
err4: