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usb-linux: fix max_packet_size for highspeed.

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Calculate the max packet size correctly.  Only bits 0..11 specify the size,
bits 11+12 specify the number of (highspeed) microframes the endpoint wants
to use.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-05-16 11:30:57 +02:00
parent 71138531d3
commit 6dfcdccb09
1 changed files with 17 additions and 2 deletions
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19
usb-linux.c
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@ -213,6 +213,22 @@ static int get_iso_buffer_used(USBHostDevice *s, int ep)
return s->endp_table[ep - 1].iso_buffer_used;
}
static void set_max_packet_size(USBHostDevice *s, int ep, uint8_t *descriptor)
{
int raw = descriptor[4] + (descriptor[5] << 8);
int size, microframes;
size = raw & 0x7ff;
switch ((raw >> 11) & 3) {
case 1: microframes = 2; break;
case 2: microframes = 3; break;
default: microframes = 1; break;
}
DPRINTF("husb: max packet size: 0x%x -> %d x %d\n",
raw, microframes, size);
s->endp_table[ep - 1].max_packet_size = size * microframes;
}
static int get_max_packet_size(USBHostDevice *s, int ep)
{
return s->endp_table[ep - 1].max_packet_size;
@ -1008,8 +1024,7 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
break;
case 0x01:
type = USBDEVFS_URB_TYPE_ISO;
s->endp_table[(devep & 0xf) - 1].max_packet_size =
descriptors[i + 4] + (descriptors[i + 5] << 8);
set_max_packet_size(s, (devep & 0xf), descriptors + i);
break;
case 0x02:
type = USBDEVFS_URB_TYPE_BULK;