usb: dwc3: core: Enable AutoRetry feature in the controller
By default when core sees any transaction error (CRC or overflow) it
replies with terminating retry ACK (Retry=1 and Nump == 0).
Enabling this Auto Retry feature in controller will make the core send
a non-terminanting ACK upon such transaction errors. That is, ACK TP
with Retry=1 and Nump != 0.
Doing so will give controller a chance to recover from transient error
conditions.
Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.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 64ba664..88c80fc 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -985,6 +985,22 @@
dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
}
+ if (dwc->dr_mode == USB_DR_MODE_HOST ||
+ dwc->dr_mode == USB_DR_MODE_OTG) {
+ reg = dwc3_readl(dwc->regs, DWC3_GUCTL);
+
+ /*
+ * Enable Auto retry Feature to make the controller operating in
+ * Host mode on seeing transaction errors(CRC errors or internal
+ * overrun scenerios) on IN transfers to reply to the device
+ * with a non-terminating retry ACK (i.e, an ACK transcation
+ * packet with Retry=1 & Nump != 0)
+ */
+ reg |= DWC3_GUCTL_HSTINAUTORETRY;
+
+ dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
+ }
+
/*
* Must config both number of packets and max burst settings to enable
* RX and/or TX threshold.