fsl_usb2_udc: Add a wmb before priming endpoint.
Add a wmb to fsl_queue_td before priming the endpoint. This ensures that the modifications to the QH are seen by the hardware. Added comment as suggested by Felipe Balbi. Signed-off-by: Will Newton <will.newton@gmail.com> Acked-by: Li Yang <leoli@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -643,6 +643,9 @@ static void fsl_queue_td(struct fsl_ep *ep, struct fsl_req *req)
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| EP_QUEUE_HEAD_STATUS_HALT));
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dQH->size_ioc_int_sts &= temp;
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/* Ensure that updates to the QH will occure before priming. */
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wmb();
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/* Prime endpoint by writing 1 to ENDPTPRIME */
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temp = ep_is_in(ep)
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? (1 << (ep_index(ep) + 16))
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