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authorAlan Stern <stern@rowland.harvard.edu>2008-04-03 18:02:56 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:48 -0700
commit7329e211b987a493cbcfca0e98c60eb108ab42df (patch)
tree20be11f1264b32f53231d62564fee04e406da033 /drivers/usb/core/hcd.c
parent6fc88f53aaa4ff8ee621353ac27269b4a656d721 (diff)
USB: root hubs don't lie about their number of TTs
Currently EHCI root hubs enumerate with a bDeviceProtocol code indicating that they possess a Transaction Translator. However the vast majority of controllers do not; they rely on a companion controller to handle full- and low-speed communications. This patch (as1064) changes the root-hub device descriptor to match the actual situation. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hcd.c')
-rw-r--r--drivers/usb/core/hcd.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index f936de75f44..e68fef5361d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -129,7 +129,7 @@ static const u8 usb2_rh_dev_descriptor [18] = {
0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
0x00, /* __u8 bDeviceSubClass; */
- 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
+ 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
@@ -354,9 +354,10 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
__attribute__((aligned(4)));
const u8 *bufp = tbuf;
int len = 0;
- int patch_wakeup = 0;
int status;
int n;
+ u8 patch_wakeup = 0;
+ u8 patch_protocol = 0;
might_sleep();
@@ -433,6 +434,8 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
else
goto error;
len = 18;
+ if (hcd->has_tt)
+ patch_protocol = 1;
break;
case USB_DT_CONFIG << 8:
if (hcd->driver->flags & HCD_USB2) {
@@ -527,6 +530,13 @@ error:
bmAttributes))
((struct usb_config_descriptor *)ubuf)->bmAttributes
|= USB_CONFIG_ATT_WAKEUP;
+
+ /* report whether RH hardware has an integrated TT */
+ if (patch_protocol &&
+ len > offsetof(struct usb_device_descriptor,
+ bDeviceProtocol))
+ ((struct usb_device_descriptor *) ubuf)->
+ bDeviceProtocol = 1;
}
/* any errors get returned through the urb completion */