usb: Fix maxpacketsize for first descriptor read for low-speed usb devs

This fixes descriptor reading of lowspeed devices through ohci not working.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Marek Vasut <marex@denx.de>

diff --git a/common/usb.c b/common/usb.c
index a4820d3e949a17c15c7deda9a3b0209abd0b3b74..1b26bfab367d2675a2dcc79bc62e81cc66762714 100644 (file)
--- a/common/usb.c
+++ b/common/usb.c
@@ -946,13 +946,18 @@ static int usb_setup_descriptor(struct usb_device *dev, bool do_read)
         * send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
         * only 18 bytes long, this will terminate with a short packet.  But if
         * the maxpacket size is 8 or 16 the device may be waiting to transmit
-        * some more, or keeps on retransmitting the 8 byte header. */
+        * some more, or keeps on retransmitting the 8 byte header.
+        */
 
-       dev->descriptor.bMaxPacketSize0 = 64;       /* Start off at 64 bytes  */
-       /* Default to 64 byte max packet size */
-       dev->maxpacketsize = PACKET_SIZE_64;
-       dev->epmaxpacketin[0] = 64;
-       dev->epmaxpacketout[0] = 64;
+       if (dev->speed == USB_SPEED_LOW) {
+               dev->descriptor.bMaxPacketSize0 = 8;
+               dev->maxpacketsize = PACKET_SIZE_8;
+       } else {
+               dev->descriptor.bMaxPacketSize0 = 64;
+               dev->maxpacketsize = PACKET_SIZE_64;
+       }
+       dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;
+       dev->epmaxpacketout[0] = dev->descriptor.bMaxPacketSize0;
 
        if (do_read) {
                int err;