112 	CX18_DEBUG_API("%s: req %#010x ack %#010x cmd %#010x err %#010x args%s\n",  in dump_mb()
113 		       name, mb->request, mb->ack, mb->cmd, mb->error,  in dump_mb()
398 		CX18_WARN("Unhandled RPU (%d) for command %x ack\n",  in mb_ack_irq()
404 	/* Don't ack if the RPU has gotten impatient and timed us out */  in mb_ack_irq()
406 	    req == cx18_readl(cx, &ack_mb->ack)) {  in mb_ack_irq()
407 …CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence …  in mb_ack_irq()
412 	cx18_writel(cx, req, &ack_mb->ack);  in mb_ack_irq()
554 	/* mb->request and mb->ack.  N.B. we want to read mb->ack last */  in cx18_api_epu_cmd_irq()
558 	if (order_mb->request == order_mb->ack) {  in cx18_api_epu_cmd_irq()
559 …CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence …  in cx18_api_epu_cmd_irq()
567 	 * Individual EPU command processing is responsible for ack-ing  in cx18_api_epu_cmd_irq()
584 	u32 irq, req, ack, err;  in cx18_api_call()  local
632 	 * If the XPU is responding with Ack's, the mailbox shouldn't be in  in cx18_api_call()
635 	 * If the wait for ack after sending a previous command was interrupted  in cx18_api_call()
637 	 * mark it "not busy" from our end, if the XPU hasn't ack'ed it still.  in cx18_api_call()
642 				 (ack = cx18_readl(cx, &mb->ack)) == req,  in cx18_api_call()
644 	if (req != ack) {  in cx18_api_call()
646 		cx18_writel(cx, req, &mb->ack);  in cx18_api_call()
661 	cx18_writel(cx, req - 1, &mb->ack); /* ensure ack & req are distinct */  in cx18_api_call()
664 	 * Notify the XPU and wait for it to send an Ack back  in cx18_api_call()
676 	ack = cx18_readl(cx, &mb->ack);  in cx18_api_call()
677 	if (ack != req) {  in cx18_api_call()
680 		ack = cx18_readl(cx, &mb->ack);  in cx18_api_call()
687 	if (req != ack) {  in cx18_api_call()
694 …woken up before mailbox ack was ready after submitting %s to RPU.  only waited %d msecs on req %u …  in cx18_api_call()
697 					req, ack);  in cx18_api_call()