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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2009-04-28 06:54:10 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-06-16 08:44:48 +0400 |
| commit | 6b403b020c1f42180b14d28d832da61167cff822 (patch) | |
| tree | 4b7271244f3b150a31c856970651d2171343d2c7 /drivers/usb/core/urb.c | |
| parent | 7f84eef0dafb1d318263d8b71c38700aaf2d530d (diff) | |
| download | linux-6b403b020c1f42180b14d28d832da61167cff822.tar.xz | |
USB: Add SuperSpeed to the list of USB device speeds.
Modify the USB core to handle the new USB 3.0 speed, "SuperSpeed". This
is 5.0 Gbps (wire speed). There are probably more places that check for
speed that I've missed.
SuperSpeed devices have a 512 byte endpoint 0 max packet size. This shows
up as a bMaxPacketSize0 set to 0x09 (see table 9-8 of the USB 3.0 bus
spec).
xHCI spec says that the xHC can handle intervals up to 2^15 microframes. That
might change when real silicon becomes available.
Add FIXME note for SuperSpeed isochronous endpoints. They can transmit up
to 16 packets in one "burst" before they wait for an acknowledgment of the
packets. They can do up to 3 bursts per microframe (determined by the
mult value in the endpoint companion descriptor). The xHCI driver doesn't
have support for isoc yet, so fix this later.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/urb.c')
| -rw-r--r-- | drivers/usb/core/urb.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 3376055f36e7..02eb0ef7a4c3 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -351,6 +351,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) if (xfertype == USB_ENDPOINT_XFER_ISOC) { int n, len; + /* FIXME SuperSpeed isoc endpoints have up to 16 bursts */ /* "high bandwidth" mode, 1-3 packets/uframe? */ if (dev->speed == USB_SPEED_HIGH) { int mult = 1 + ((max >> 11) & 0x03); @@ -426,6 +427,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) return -EINVAL; /* too big? */ switch (dev->speed) { + case USB_SPEED_SUPER: /* units are 125us */ + /* Handle up to 2^(16-1) microframes */ + if (urb->interval > (1 << 15)) + return -EINVAL; + max = 1 << 15; case USB_SPEED_HIGH: /* units are microframes */ /* NOTE usb handles 2^15 */ if (urb->interval > (1024 * 8)) |