diff options
| author | Julius Werner <jwerner@chromium.org> | 2013-04-15 22:55:04 (GMT) |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-06-05 23:41:47 (GMT) |
| commit | 01c5f4477d527732ecaf92d9b3d2201c8030000b (patch) | |
| tree | 408de03b6f45f1127290b49bb416bbb2dc35b5e7 /drivers/usb/host/xhci.c | |
| parent | 0c967e7ecdc2cf42853b4c76f0b2e94ba53c5b92 (diff) | |
| download | linux-fsl-qoriq-01c5f4477d527732ecaf92d9b3d2201c8030000b.tar.xz | |
usb: xhci-dbg: Display endpoint number and direction in context dump
When CONFIG_XHCI_HCD_DEBUGGING is activated, the XHCI driver can dump
device and input contexts to the console. The endpoint contexts in that
dump are labeled "Endpoint N Context", where N is the XHCI endpoint
index (DCI - 1). This can be very confusing, especially for people who
are not that familiar with the XHCI specification. This patch introduces
an xhci_get_endpoint_address function (as a counterpart to the reverse
xhci_get_endpoint_index), and uses it to additionally display the
endpoint number and direction when dumping contexts, which are much more
commonly used concepts in USB.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index b4aa79d..9e72caf 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1111,6 +1111,16 @@ unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc) return index; } +/* The reverse operation to xhci_get_endpoint_index. Calculate the USB endpoint + * address from the XHCI endpoint index. + */ +unsigned int xhci_get_endpoint_address(unsigned int ep_index) +{ + unsigned int number = DIV_ROUND_UP(ep_index, 2); + unsigned int direction = ep_index % 2 ? USB_DIR_OUT : USB_DIR_IN; + return direction | number; +} + /* Find the flag for this endpoint (for use in the control context). Use the * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is * bit 1, etc. |