diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2015-05-05 23:56:04 +0200 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-05-06 08:46:56 -0600 |
| commit | 2b338ef41127351089254b748de5cefd95c3e800 (patch) | |
| tree | 10f3488e386e2832d68acd6bc133713862eb3945 /common/usb.c | |
| parent | cb8a2c148a55adfd0f07e723eedbc4ef95e8226d (diff) | |
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>
Diffstat (limited to 'common/usb.c')
| -rw-r--r-- | common/usb.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/common/usb.c b/common/usb.c index a4820d3e94..1b26bfab36 100644 --- 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; |