ALSA: hda - Inform too slow responses

For the sake of debugging, show each response that took too long time
and its corresponding last verb.  Since such an error happens in
series once when started, use the ratelimited variant for suppressing
the flood.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_controller.c

@@ -789,6 +789,7 @@ static int azx_rirb_get_response(struct hdac_bus *bus, unsigned int addr,
 	unsigned long timeout;
 	unsigned long loopcounter;
 	int do_poll = 0;
+	bool warned = false;
 
  again:
 	timeout = jiffies + msecs_to_jiffies(1000);
@@ -808,9 +809,17 @@ static int azx_rirb_get_response(struct hdac_bus *bus, unsigned int addr,
 		spin_unlock_irq(&bus->reg_lock);
 		if (time_after(jiffies, timeout))
 			break;
-		if (hbus->needs_damn_long_delay || loopcounter > 3000)
+#define LOOP_COUNT_MAX	3000
+		if (hbus->needs_damn_long_delay ||
+		    loopcounter > LOOP_COUNT_MAX) {
+			if (loopcounter > LOOP_COUNT_MAX && !warned) {
+				dev_dbg_ratelimited(chip->card->dev,
+						    "too slow response, last cmd=%#08x\n",
+						    bus->last_cmd[addr]);
+				warned = true;
+			}
 			msleep(2); /* temporary workaround */
-		else {
+		} else {
 			udelay(10);
 			cond_resched();
 		}