---

yaml --- r: 303838 b: refs/heads/master c: 07e7f47 h: refs/heads/master v: v3
git-mirror · Apr 11, 2012 · c3d1963 · c3d1963
1 parent a55e47d
commit c3d1963
Show file tree

Hide file tree

Showing 2 changed files with 19 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1522d7034d739f2d348f4c544fe12ff9627c36a4
+refs/heads/master: 07e7f47b6d8da3e290f90615c9a74dff0115709e
diff --git a/trunk/drivers/usb/dwc3/gadget.c b/trunk/drivers/usb/dwc3/gadget.c
@@ -1356,7 +1356,24 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 
 	reg = dwc3_readl(dwc->regs, DWC3_DCFG);
 	reg &= ~(DWC3_DCFG_SPEED_MASK);
-	reg |= dwc->maximum_speed;
+
+	/**
+	 * WORKAROUND: DWC3 revision < 2.20a have an issue
+	 * which would cause metastability state on Run/Stop
+	 * bit if we try to force the IP to USB2-only mode.
+	 *
+	 * Because of that, we cannot configure the IP to any
+	 * speed other than the SuperSpeed
+	 *
+	 * Refers to:
+	 *
+	 * STAR#9000525659: Clock Domain Crossing on DCTL in
+	 * USB 2.0 Mode
+	 */
+	if (dwc->revision < DWC3_REVISION_220A)
+		reg |= DWC3_DCFG_SUPERSPEED;
+	else
+		reg |= dwc->maximum_speed;
 	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 
 	dwc->start_config_issued = false;