usb: Read device descriptor after device is addressed for xHCI

For xHCI it is not possible to read a device descriptor before it has been assigned an address. That's why usb_setup_descriptor() was called with 'do_read' being false. But we really need try to read the device descriptor before starting any real communication with the default control endpoint. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

usb: Read device descriptor after device is addressed for xHCI
For xHCI it is not possible to read a device descriptor before it has been assigned an address. That's why usb_setup_descriptor() was called with 'do_read' being false. But we really need try to read the device descriptor before starting any real communication with the default control endpoint. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Bin Meng · Marek Vasut
1 parent c008faa773
Showing 1 changed file with 11 additions and 0 deletions Side-by-side Diff
common/usb.c
@@ -1052,6 +1052,17 @@
  
 	mdelay(10);	/* Let the SET_ADDRESS settle */
  
+	/*
+	 * If we haven't read device descriptor before, read it here
+	 * after device is assigned an address. This is only applicable
+	 * to xHCI so far.
+	 */
+	if (!do_read) {
+		err = usb_setup_descriptor(dev, true);
+		if (err)
+			return err;
+	}
+
 	return 0;
 }
...	...	@@ -1052,6 +1052,17 @@
1052	1052
1053	1053	mdelay(10); /* Let the SET_ADDRESS settle */
1054	1054
	1055	+ /*
	1056	+ * If we haven't read device descriptor before, read it here
	1057	+ * after device is assigned an address. This is only applicable
	1058	+ * to xHCI so far.
	1059	+ */
	1060	+ if (!do_read) {
	1061	+ err = usb_setup_descriptor(dev, true);
	1062	+ if (err)
	1063	+ return err;
	1064	+ }
	1065	+
1055	1066	return 0;
1056	1067	}
1057	1068