[U-Boot] [PATCH v4 4/4] usb: dwc2 : invalidate dcache before starting DMA

[Simon Glass]

On 14 July 2016 at 00:52, Ziyuan Xu <xzy.xu at rock-chips.com> wrote:
> From: Xu Ziyuan <xzy.xu at rock-chips.com>
>
> 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 at rock-chips.com>
>
> ---
>
> Changes in v4: None
> Changes in v3:
> - New commit since v3 to fix the coherence issue between memory and
> cache
>
> Changes in v2: None
>
>  drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 3 +++
>  1 file changed, 3 insertions(+)

Acked-by: Simon Glass <sjg at chromium.org>