diff options
| author | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-04-05 12:14:31 +0200 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-04-19 10:11:51 +0200 |
| commit | 4faf75504a7db790483aa419d8f61e58cec4934c (patch) | |
| tree | f1993e47eaf5c429516465c043c31bbb2884d382 /drivers/usb | |
| parent | usb: dwc3: gadget: add trb enqueue/dequeue helpers (diff) | |
| download | linux-4faf75504a7db790483aa419d8f61e58cec4934c.tar.xz linux-4faf75504a7db790483aa419d8f61e58cec4934c.zip | |
usb: dwc3: gadget: move % operation to increment helpers
By moving our % DWC3_NUM_TRB operation to the
increment helpers, the rest of the driver can be
simplified.
It's also a good practice to make sure we will have
a single place dealing with details about how to
increment our enqueue and dequeue pointers.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 98d8a4549103..6c5eb0c59696 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -148,16 +148,18 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state) static void dwc3_ep_inc_enq(struct dwc3_ep *dep) { dep->trb_enqueue++; + dep->trb_enqueue %= DWC3_TRB_NUM; } static void dwc3_ep_inc_deq(struct dwc3_ep *dep) { dep->trb_dequeue++; + dep->trb_dequeue %= DWC3_TRB_NUM; } static int dwc3_ep_is_last_trb(unsigned int index) { - return (index % DWC3_TRB_NUM) == (DWC3_TRB_NUM - 1); + return index == DWC3_TRB_NUM - 1; } void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req, @@ -755,13 +757,13 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep, chain ? " chain" : ""); - trb = &dep->trb_pool[dep->trb_enqueue % DWC3_TRB_NUM]; + trb = &dep->trb_pool[dep->trb_enqueue]; if (!req->trb) { dwc3_gadget_move_started_request(req); req->trb = trb; req->trb_dma = dwc3_trb_dma_offset(dep, trb); - req->first_trb_index = dep->trb_enqueue % DWC3_TRB_NUM; + req->first_trb_index = dep->trb_enqueue; } dwc3_ep_inc_enq(dep); @@ -840,11 +842,11 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep, bool starting) BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM); /* the first request must not be queued */ - trbs_left = (dep->trb_dequeue - dep->trb_enqueue) % DWC3_TRB_NUM; + trbs_left = dep->trb_dequeue - dep->trb_enqueue; /* Can't wrap around on a non-isoc EP since there's no link TRB */ if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - max = DWC3_TRB_NUM - (dep->trb_enqueue % DWC3_TRB_NUM); + max = DWC3_TRB_NUM - dep->trb_enqueue; if (trbs_left > max) trbs_left = max; } |