[PATCH 3.18 085/145] usb: gadget: function: f_fs: pass companion descriptor along

Greg Kroah-Hartman
2017-04-16T11:11:58Z

From: Felipe Balbi <felipe.balbi@linux.intel.com>

commit 2bfa0719ac2a9b2f3c91345873d3cdebd0296ba9 upstream.

If we're dealing with SuperSpeed endpoints, we need
to make sure to pass along the companion descriptor
and initialize fields needed by the Gadget
API. Eventually, f_fs.c should be converted to use
config_ep_by_speed() like all other functions,
though.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/gadget/function/f_fs.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1649,11 +1649,14 @@ static int ffs_func_eps_enable(struct ff
spin_lock_irqsave(&func->ffs->eps_lock, flags);
do {
struct usb_endpoint_descriptor *ds;
+ struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
+ int needs_comp_desc = false;
int desc_idx;

- if (ffs->gadget->speed == USB_SPEED_SUPER)
+ if (ffs->gadget->speed == USB_SPEED_SUPER) {
desc_idx = 2;
- else if (ffs->gadget->speed == USB_SPEED_HIGH)
+ needs_comp_desc = true;
+ } else if (ffs->gadget->speed == USB_SPEED_HIGH)
desc_idx = 1;
else
desc_idx = 0;
@@ -1670,6 +1673,14 @@ static int ffs_func_eps_enable(struct ff

ep->ep->driver_data = ep;
ep->ep->desc = ds;
+
+ comp_desc = (struct usb_ss_ep_comp_descriptor *)(ds +
+ USB_DT_ENDPOINT_SIZE);
+ ep->ep->maxburst = comp_desc->bMaxBurst + 1;
+
+ if (needs_comp_desc)
+ ep->ep->comp_desc = comp_desc;
+
ret = usb_ep_enable(ep->ep);
if (likely(!ret)) {
epfile->ep = ep;