On 14 July 2016 at 21:20, Simon Glass sjg@chromium.org wrote:
On 14 July 2016 at 00:52, Ziyuan Xu xzy.xu@rock-chips.com wrote:
From: Xu Ziyuan xzy.xu@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@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@chromium.org
Applied to u-boot-rockchip, thanks!