121 	CX18_DEBUG_API("%s: req %#010x ack %#010x cmd %#010x err %#010x args%s\n",  in dump_mb()
122 		       name, mb->request, mb->ack, mb->cmd, mb->error,  in dump_mb()
406 		CX18_WARN("Unhandled RPU (%d) for command %x ack\n",  in mb_ack_irq()
412 	/* Don't ack if the RPU has gotten impatient and timed us out */  in mb_ack_irq()
414 	    req == cx18_readl(cx, &ack_mb->ack)) {  in mb_ack_irq()
415 …CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence …  in mb_ack_irq()
420 	cx18_writel(cx, req, &ack_mb->ack);  in mb_ack_irq()
562 	/* mb->request and mb->ack.  N.B. we want to read mb->ack last */  in cx18_api_epu_cmd_irq()
566 	if (order_mb->request == order_mb->ack) {  in cx18_api_epu_cmd_irq()
567 …CX18_DEBUG_WARN("Possibly falling behind: %s self-ack'ed our incoming %s to EPU mailbox (sequence …  in cx18_api_epu_cmd_irq()
575 	 * Individual EPU command processing is responsible for ack-ing  in cx18_api_epu_cmd_irq()
592 	u32 irq, req, ack, err;  in cx18_api_call()  local
640 	 * If the XPU is responding with Ack's, the mailbox shouldn't be in  in cx18_api_call()
643 	 * If the wait for ack after sending a previous command was interrupted  in cx18_api_call()
645 	 * mark it "not busy" from our end, if the XPU hasn't ack'ed it still.  in cx18_api_call()
650 				 (ack = cx18_readl(cx, &mb->ack)) == req,  in cx18_api_call()
652 	if (req != ack) {  in cx18_api_call()
654 		cx18_writel(cx, req, &mb->ack);  in cx18_api_call()
669 	cx18_writel(cx, req - 1, &mb->ack); /* ensure ack & req are distinct */  in cx18_api_call()
672 	 * Notify the XPU and wait for it to send an Ack back  in cx18_api_call()
684 	ack = cx18_readl(cx, &mb->ack);  in cx18_api_call()
685 	if (ack != req) {  in cx18_api_call()
688 		ack = cx18_readl(cx, &mb->ack);  in cx18_api_call()
695 	if (req != ack) {  in cx18_api_call()
702 …woken up before mailbox ack was ready after submitting %s to RPU.  only waited %d msecs on req %u …  in cx18_api_call()
705 					req, ack);  in cx18_api_call()