usb: gadget: mv_udc: optimize bounce

Only perform one copy, either in the bounce routine for IN transfers, or the debounce rtn for OUT transfer. On out transfers, only copy the number of bytes received from the bounce buffer Signed-off-by: Troy Kisky <[email protected]>
Keerthyj · Oct 20, 2013 · 1ebf027 · 1ebf027
1 parent 3b59abf
commit 1ebf027
Showing 1 changed file with 16 additions and 21 deletions.
diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c
@@ -261,7 +261,7 @@ static int mv_ep_disable(struct usb_ep *ep)
 	return 0;
 }
 
-static int mv_bounce(struct mv_ep *ep)
+static int mv_bounce(struct mv_ep *ep, int in)
 {
 	uint32_t addr = (uint32_t)ep->req.buf;
 	uint32_t ba;
@@ -290,8 +290,8 @@ static int mv_bounce(struct mv_ep *ep)
 		if (!ep->b_buf)
 			return -ENOMEM;
 	}
-
-	memcpy(ep->b_buf, ep->req.buf, ep->req.length);
+	if (in)
+		memcpy(ep->b_buf, ep->req.buf, ep->req.length);
 
 flush:
 	ba = (uint32_t)ep->b_buf;
@@ -300,29 +300,25 @@ static int mv_bounce(struct mv_ep *ep)
 	return 0;
 }
 
-static void mv_debounce(struct mv_ep *ep)
+static void mv_debounce(struct mv_ep *ep, int in)
 {
 	uint32_t addr = (uint32_t)ep->req.buf;
 	uint32_t ba = (uint32_t)ep->b_buf;
 
+	if (in) {
+		if (addr == ba)
+			return;		/* not a bounce */
+		goto free;
+	}
 	invalidate_dcache_range(ba, ba + ep->b_len);
 
-	/* Input buffer address is not aligned. */
-	if (addr & (ARCH_DMA_MINALIGN - 1))
-		goto copy;
-
-	/* Input buffer length is not aligned. */
-	if (ep->req.length & (ARCH_DMA_MINALIGN - 1))
-		goto copy;
-
-	/* The buffer is well aligned, only invalidate cache. */
-	return;
+	if (addr == ba)
+		return;		/* not a bounce */
 
-copy:
 	memcpy(ep->req.buf, ep->b_buf, ep->req.length);
-
+free:
 	/* Large payloads use allocated buffer, free it. */
-	if (ep->req.length > 64)
+	if (ep->b_buf != ep->b_fast)
 		free(ep->b_buf);
 }
 
@@ -340,7 +336,7 @@ static int mv_ep_queue(struct usb_ep *ep,
 	head = mv_get_qh(num, in);
 	len = req->length;
 
-	ret = mv_bounce(mv_ep);
+	ret = mv_bounce(mv_ep, in);
 	if (ret)
 		return ret;
 
@@ -383,10 +379,9 @@ static void handle_ep_complete(struct mv_ep *ep)
 		       num, in ? "in" : "out", item->info, item->page0);
 
 	len = (item->info >> 16) & 0x7fff;
-
-	mv_debounce(ep);
-
 	ep->req.length -= len;
+	mv_debounce(ep, in);
+
 	DBG("ept%d %s complete %x\n",
 			num, in ? "in" : "out", len);
 	ep->req.complete(&ep->ep, &ep->req);