Commits
Peter Chen committed 8bf9aa453b7
ENGR00154704 usb-gadget: wmb is needed after dtd pointer is updated for armv7 At armv7 SoC, the dma_alloc_coherent returns non-cachable, but bufferable region, so the driver needs to drain write buffer by itself, if the controller needs to visit dma buffer immediately after cpu writes There is a discussion for this armv7 change: http://marc.info/?t=127918539100004&r=1&w=2 For this issue, the next dtd pointer is invalid sometimes, the reason is the region which is used to store dtd is dma buffer, so the data may not be written to memory when the controller visit this data. Signed-off-by: Peter Chen <peter.chen@freescale.com>