diff options
| author | Xu Ziyuan <xzy.xu@rock-chips.com> | 2016-07-14 14:52:35 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-07-25 20:44:19 -0600 |
| commit | 9424f1418377bfb0c95ed36a8854e7fe53436229 (patch) | |
| tree | 33768026a1ec458f79ba7b19234b71d27bbd7497 /drivers/usb/gadget | |
| parent | 47117882671fbfb5ffa20cd25ec29da5b7143009 (diff) | |
usb: dwc2 : invalidate dcache before starting DMA
Invalidate dcache before starting the DMA to ensure coherency. In case
there are any dirty lines from the DMA buffer in the cache, subsequent
cache-line replacements may corrupt the buffer in memory while the DMA
is still going on. Cache-line replacement can happen if the CPU tries to
bring some other memory locations into the cache while the DMA is going
on.
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c b/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c index 12f5c85c31..0d6d2fba8a 100644 --- a/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c +++ b/drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c @@ -110,6 +110,9 @@ static int setdma_rx(struct dwc2_ep *ep, struct dwc2_request *req) ctrl = readl(®->out_endp[ep_num].doepctl); + invalidate_dcache_range((unsigned long) ep->dma_buf, + (unsigned long) ep->dma_buf + ep->len); + writel((unsigned int) ep->dma_buf, ®->out_endp[ep_num].doepdma); writel(DOEPT_SIZ_PKT_CNT(pktcnt) | DOEPT_SIZ_XFER_SIZE(length), ®->out_endp[ep_num].doeptsiz); |