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usb: dwc3: gadget: do not map/unmap ZLP transfers 

If the gadget drivers sends a ZLP we are trying to map this this request
which does not work on all implementations. So we simply skip mapping
it.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Sebastian Andrzej Siewior 2011-08-31 17:12:02 +02:00 committed by Felipe Balbi
parent 42077b0a33
commit 78c58a53c9
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/dwc3/gadget.c
View File

@ -61,6 +61,11 @@ void dwc3_map_buffer_to_dma(struct dwc3_request *req)
{
struct dwc3 *dwc = req->dep->dwc;
if (req->request.length == 0) {
/* req->request.dma = dwc->setup_buf_addr; */
return;
}
if (req->request.dma == DMA_ADDR_INVALID) {
req->request.dma = dma_map_single(dwc->dev, req->request.buf,
req->request.length, req->direction
@ -78,6 +83,11 @@ void dwc3_unmap_buffer_from_dma(struct dwc3_request *req)
{
struct dwc3 *dwc = req->dep->dwc;
if (req->request.length == 0) {
req->request.dma = DMA_ADDR_INVALID;
return;
}
if (req->mapped) {
dma_unmap_single(dwc->dev, req->request.dma,
req->request.length, req->direction