ALSA: hda: Unify get_response handling

Now most of the get_response handling became quite similar between
HDA-core and legacy drivers, and the only differences are:

- the handling of extra-long polling delay for some codecs
- the debug message for the stalled communication

and both are worth to share in the common code.

This patch unifies the code into snd_hdac_bus_get_response(), and use
this from the legacy get_response callback.  It results in a good
amount of code reduction in the end.

Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191212191101.19517-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hda_codec.h

@@ -51,7 +51,6 @@ struct hda_bus {
 	DECLARE_BITMAP(pcm_dev_bits, SNDRV_PCM_DEVICES);
 
 	/* misc op flags */
-	unsigned int needs_damn_long_delay :1;
 	unsigned int allow_bus_reset:1;	/* allow bus reset at fatal error */
 	/* status for codec/controller */
 	unsigned int shutdown :1;	/* being unloaded */

include/sound/hdaudio.h

@@ -338,6 +338,7 @@ struct hdac_bus {
 	bool reverse_assign:1;		/* assign devices in reverse order */
 	bool corbrp_self_clear:1;	/* CORBRP clears itself after reset */
 	bool polling_mode:1;
+	bool needs_damn_long_delay:1;
 
 	int poll_count;
 

sound/hda/hdac_controller.c

@@ -242,6 +242,7 @@ int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
 	unsigned long timeout;
 	unsigned long loopcounter;
 	wait_queue_entry_t wait;
+	bool warned = false;
 
 	init_wait_entry(&wait, 0);
 	timeout = jiffies + msecs_to_jiffies(1000);
@@ -264,9 +265,17 @@ int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
 		spin_unlock_irq(&bus->reg_lock);
 		if (time_after(jiffies, timeout))
 			break;
+#define LOOP_COUNT_MAX	3000
 		if (!bus->polling_mode) {
 			schedule_timeout(msecs_to_jiffies(2));
-		} else if (loopcounter > 3000) {
+		} else if (bus->needs_damn_long_delay ||
+			   loopcounter > LOOP_COUNT_MAX) {
+			if (loopcounter > LOOP_COUNT_MAX && !warned) {
+				dev_dbg_ratelimited(bus->dev,
+						    "too slow response, last cmd=%#08x\n",
+						    bus->last_cmd[addr]);
+				warned = true;
+			}
 			msleep(2); /* temporary workaround */
 		} else {
 			udelay(10);

sound/pci/hda/hda_controller.c

@@ -784,53 +784,12 @@ static int azx_rirb_get_response(struct hdac_bus *bus, unsigned int addr,
 {
 	struct azx *chip = bus_to_azx(bus);
 	struct hda_bus *hbus = &chip->bus;
-	unsigned long timeout;
-	unsigned long loopcounter;
-	wait_queue_entry_t wait;
-	bool warned = false;
+	int err;
 
-	init_wait_entry(&wait, 0);
  again:
-	timeout = jiffies + msecs_to_jiffies(1000);
-
-	for (loopcounter = 0;; loopcounter++) {
-		spin_lock_irq(&bus->reg_lock);
-		if (!bus->polling_mode)
-			prepare_to_wait(&bus->rirb_wq, &wait,
-					TASK_UNINTERRUPTIBLE);
-		if (bus->polling_mode)
-			snd_hdac_bus_update_rirb(bus);
-		if (!bus->rirb.cmds[addr]) {
-			if (res)
-				*res = bus->rirb.res[addr]; /* the last value */
-			if (!bus->polling_mode)
-				finish_wait(&bus->rirb_wq, &wait);
-			spin_unlock_irq(&bus->reg_lock);
-			return 0;
-		}
-		spin_unlock_irq(&bus->reg_lock);
-		if (time_after(jiffies, timeout))
-			break;
-#define LOOP_COUNT_MAX	3000
-		if (!bus->polling_mode) {
-			schedule_timeout(msecs_to_jiffies(2));
-		} else 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 {
-			udelay(10);
-			cond_resched();
-		}
-	}
-
-	if (!bus->polling_mode)
-		finish_wait(&bus->rirb_wq, &wait);
+	err = snd_hdac_bus_get_response(bus, addr, res);
+	if (!err)
+		return 0;
 
 	if (hbus->no_response_fallback)
 		return -EIO;

sound/pci/hda/hda_intel.c

@@ -1809,7 +1809,7 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci,
 
 	if (chip->driver_type == AZX_DRIVER_NVIDIA) {
 		dev_dbg(chip->card->dev, "Enable delay in RIRB handling\n");
-		chip->bus.needs_damn_long_delay = 1;
+		chip->bus.core.needs_damn_long_delay = 1;
 	}
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);

sound/pci/hda/hda_tegra.c

@@ -394,7 +394,7 @@ static int hda_tegra_create(struct snd_card *card,
 	if (err < 0)
 		return err;
 
-	chip->bus.needs_damn_long_delay = 1;
+	chip->bus.core.needs_damn_long_delay = 1;
 
 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 	if (err < 0) {

sound/pci/hda/patch_ca0110.c

@@ -53,7 +53,7 @@ static int patch_ca0110(struct hda_codec *codec)
 	codec->patch_ops = ca0110_patch_ops;
 
 	spec->multi_cap_vol = 1;
-	codec->bus->needs_damn_long_delay = 1;
+	codec->bus->core.needs_damn_long_delay = 1;
 
 	err = ca0110_parse_auto_config(codec);
 	if (err < 0)

sound/pci/hda/patch_sigmatel.c

@@ -4908,7 +4908,7 @@ static int patch_stac927x(struct hda_codec *codec)
 	 * The below flag enables the longer delay (see get_response
 	 * in hda_intel.c).
 	 */
-	codec->bus->needs_damn_long_delay = 1;
+	codec->bus->core.needs_damn_long_delay = 1;
 
 	snd_hda_apply_fixup(codec, HDA_FIXUP_ACT_PROBE);