[U-Boot] [PATCH 01/16] usb: Fix maxpacketsize for first descriptor read for low-speed usb devs

[Hans de Goede]

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

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 common/usb.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/common/usb.c b/common/usb.c
index 48f0780..4a09583 100644
--- a/common/usb.c
+++ b/common/usb.c
@@ -948,13 +948,18 @@ 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;
-- 
2.3.6