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

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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>
This commit is contained in:
Hans de Goede 2015-05-05 23:56:04 +02:00 committed by Simon Glass
parent cb8a2c148a
commit 2b338ef411
1 changed files with 11 additions and 6 deletions
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17
common/usb.c
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@ -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;