ALSA: usb-audio: Move set-interface-first workaround into common quirk

The recent quirk for WALKMAN (commit 7af5a14371c1: "ALSA: usb-audio:
Fix regression on Sony WALKMAN NW-A45 DAC") may be required for other
devices and is worth to be put into the common quirk flags.
This patch adds a new quirk flag bit QUIRK_FLAG_SET_IFACE_FIRST and a
quirk table entry for the device.

Link: https://lore.kernel.org/r/20210824055720.9240-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/alsa-configuration.rst

@@ -2278,6 +2278,7 @@ quirk_flags
         * bit 13: Disable runtime PM autosuspend
         * bit 14: Ignore errors for mixer access
         * bit 15: Support generic DSD raw U32_BE format
+        * bit 16: Set up the interface at first like UAC1
 
 This module supports multiple devices, autoprobe and hotplugging.
 

sound/usb/endpoint.c

@@ -1293,10 +1293,8 @@ int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
 	 * to be set up before parameter setups
 	 */
 	iface_first = ep->cur_audiofmt->protocol == UAC_VERSION_1;
-	/* Workaround for Sony WALKMAN NW-A45 DAC;
-	 * it requires the interface setup at first like UAC1
-	 */
-	if (chip->usb_id == USB_ID(0x054c, 0x0b8c))
+	/* Workaround for devices that require the interface setup at first like UAC1 */
+	if (chip->quirk_flags & QUIRK_FLAG_SET_IFACE_FIRST)
 		iface_first = true;
 	if (iface_first) {
 		err = endpoint_set_interface(chip, ep, true);

sound/usb/quirks.c

@@ -1790,6 +1790,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
 	DEVICE_FLG(0x04e8, 0xa051, /* Samsung USBC Headset (AKG) */
 		   QUIRK_FLAG_SKIP_CLOCK_SELECTOR | QUIRK_FLAG_CTL_MSG_DELAY_5M),
+	DEVICE_FLG(0x054c, 0x0b8c, /* Sony WALKMAN NW-A45 DAC */
+		   QUIRK_FLAG_SET_IFACE_FIRST),
 	DEVICE_FLG(0x0556, 0x0014, /* Phoenix Audio TMX320VC */
 		   QUIRK_FLAG_GET_SAMPLE_RATE),
 	DEVICE_FLG(0x05a3, 0x9420, /* ELP HD USB Camera */

sound/usb/usbaudio.h

@@ -161,6 +161,8 @@ extern bool snd_usb_skip_validation;
  *  Ignore errors for mixer access
  * QUIRK_FLAG_DSD_RAW:
  *  Support generic DSD raw U32_BE format
+ * QUIRK_FLAG_SET_IFACE_FIRST:
+ *  Set up the interface at first like UAC1
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE	(1U << 0)
@@ -179,5 +181,6 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_DISABLE_AUTOSUSPEND	(1U << 13)
 #define QUIRK_FLAG_IGNORE_CTL_ERROR	(1U << 14)
 #define QUIRK_FLAG_DSD_RAW		(1U << 15)
+#define QUIRK_FLAG_SET_IFACE_FIRST	(1U << 16)
 
 #endif /* __USBAUDIO_H */