usb: dwc3: ep0: preparation for handling non maxpacket aligned transfers > 512
No functional change. This is in preparation for handling non maxpacket
aligned transfers greater than bounce buffer size. This is basically to
avoid code duplication when using chained TRB transfers to handle
non maxpacket aligned transfers greater than bounce buffer size.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 672d55a..396c2af 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -783,7 +783,11 @@
struct usb_request *ur;
struct dwc3_trb *trb;
struct dwc3_ep *ep0;
- u32 transferred;
+ unsigned transfer_size = 0;
+ unsigned maxp;
+ unsigned remaining_ur_length;
+ void *buf;
+ u32 transferred = 0;
u32 status;
u32 length;
u8 epnum;
@@ -812,20 +816,24 @@
}
ur = &r->request;
+ buf = ur->buf;
+ remaining_ur_length = ur->length;
length = trb->size & DWC3_TRB_SIZE_MASK;
+ maxp = ep0->endpoint.maxpacket;
+
if (dwc->ep0_bounced) {
- unsigned maxp = ep0->endpoint.maxpacket;
- unsigned transfer_size = roundup(ur->length, maxp);
+ transfer_size = roundup((ur->length - transfer_size),
+ maxp);
/* Maximum of DWC3_EP0_BOUNCE_SIZE can only be received */
if (transfer_size > DWC3_EP0_BOUNCE_SIZE)
transfer_size = DWC3_EP0_BOUNCE_SIZE;
- transferred = min_t(u32, ur->length,
- transfer_size - length);
- memcpy(ur->buf, dwc->ep0_bounce, transferred);
+ transferred = min_t(u32, remaining_ur_length,
+ transfer_size - length);
+ memcpy(buf, dwc->ep0_bounce, transferred);
} else {
transferred = ur->length - length;
}
@@ -934,7 +942,7 @@
DWC3_TRBCTL_CONTROL_DATA);
} else if (!IS_ALIGNED(req->request.length, dep->endpoint.maxpacket)
&& (dep->number == 0)) {
- u32 transfer_size;
+ u32 transfer_size = 0;
u32 maxpacket;
ret = usb_gadget_map_request(&dwc->gadget, &req->request,
@@ -945,7 +953,8 @@
}
maxpacket = dep->endpoint.maxpacket;
- transfer_size = roundup(req->request.length, maxpacket);
+ transfer_size = roundup((req->request.length - transfer_size),
+ maxpacket);
if (transfer_size > DWC3_EP0_BOUNCE_SIZE) {
dev_WARN(dwc->dev, "bounce buf can't handle req len\n");