usb: gadget: aspeed: Workaround memory ordering issue

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The Aspeed SoC has a memory ordering issue that (thankfully)
only affects the USB gadget device. A read back is necessary
after writing to memory and before letting the device DMA
from it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

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This commit is contained in:

Benjamin Herrenschmidt 2018-07-12 15:05:02 +10:00 • committed by Felipe Balbi

parent 9566a7c72f

commit bb28633695

3 changed files with 46 additions and 3 deletions

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2

drivers/usb/gadget/udc/aspeed-vhub/ep0.c

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14

drivers/usb/gadget/udc/aspeed-vhub/epn.c

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33

drivers/usb/gadget/udc/aspeed-vhub/vhub.h

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