ALSA: usb-audio: Move playback_first flag into quirk_flags

The snd_usb_audio.playback_first flag is used by the implicit feedback
mode handling, and this can be also moved to quirk_flags.

Link: https://lore.kernel.org/r/20210729073855.19043-6-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/endpoint.c

@@ -1382,7 +1382,7 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
 		goto __error;
 
 	if (snd_usb_endpoint_implicit_feedback_sink(ep) &&
-	    !ep->chip->playback_first) {
+	    !(ep->chip->quirk_flags & QUIRK_FLAG_PLAYBACK_FIRST)) {
 		for (i = 0; i < ep->nurbs; i++) {
 			struct snd_urb_ctx *ctx = ep->urb + i;
 			list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);

sound/usb/implicit.c

@@ -171,7 +171,7 @@ static int add_roland_implicit_fb(struct snd_usb_audio *chip,
 	if (!usb_endpoint_is_isoc_in(epd) ||
 	    (epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
 		return 0;
-	chip->playback_first = 1;
+	chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
 	return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress, 0,
 				       alts->desc.bInterfaceNumber, alts);
 }
@@ -320,7 +320,7 @@ static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
 		case IMPLICIT_FB_FIXED:
 			return 0; /* no quirk */
 		case IMPLICIT_FB_BOTH:
-			chip->playback_first = 1;
+			chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
 			return add_generic_implicit_fb(chip, fmt, alts);
 		}
 	}
@@ -344,7 +344,7 @@ static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
 
 	/* Pioneer devices with vendor spec class */
 	if (is_pioneer_implicit_fb(chip, alts)) {
-		chip->playback_first = 1;
+		chip->quirk_flags |= QUIRK_FLAG_PLAYBACK_FIRST;
 		return add_implicit_fb_sync_ep(chip, fmt,
 					       get_endpoint(alts, 1)->bEndpointAddress,
 					       1, alts->desc.bInterfaceNumber,

sound/usb/usbaudio.h

@@ -36,7 +36,6 @@ struct snd_usb_audio {
 	wait_queue_head_t shutdown_wait;
 	unsigned int quirk_flags;
 	unsigned int need_delayed_register:1; /* warn for delayed registration */
-	unsigned int playback_first:1;	/* for implicit fb: don't wait for the first capture URBs */
 	int num_interfaces;
 	int num_suspended_intf;
 	int sample_rate_read_error;
@@ -139,11 +138,14 @@ extern bool snd_usb_skip_validation;
  *  slots (audio frames)
  * QUIRK_TX_LENGTH:
  *  Add length specifier to transfers
+ * QUIRK_FLAG_PLAYBACK_FIRST:
+ *  Start playback stream at first even in implement feedback mode
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE	(1U << 0)
 #define QUIRK_FLAG_SHARE_MEDIA_DEVICE	(1U << 1)
 #define QUIRK_FLAG_ALIGN_TRANSFER	(1U << 2)
 #define QUIRK_FLAG_TX_LENGTH		(1U << 3)
+#define QUIRK_FLAG_PLAYBACK_FIRST	(1U << 4)
 
 #endif /* __USBAUDIO_H */