[PATCH v2] ALSA: usb-audio: Add quirk for Logitech PRO X 2 LIGHTSPEED

[Brian van den Berg]

The UAC mixer of Logitech PRO X 2 LIGHTSPEED works fine except that its
volume GET_CUR method returns sticky values.

Since commit 86aa1ea1f15c
("ALSA: usb-audio: Do not expose sticky mixers"), the sticky check
considers the mixer to be sticky and unnecessarily disables the mixer.

Add QUIRK_FLAG_MIXER_GET_CUR_BROKEN for Logitech PRO X 2 LIGHTSPEED
(046d:0af7) to address this.

Compiled and tested on 7.2-rc5

Signed-off-by: Brian van den Berg <faxuser@xxxxxxxxx>
---
Output with quirk enabled:

  usb 3-2.1: New USB device found, idVendor=046d, idProduct=0af7, bcdDevice= 1.00
  usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  usb 3-2.1: Product: PRO X 2 LIGHTSPEED
  usb 3-2.1: Manufacturer: Logitech
  usb 3-2.1: SerialNumber: 0000000000000000
  input: Logitech PRO X 2 LIGHTSPEED Consumer Control as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input6
  input: Logitech PRO X 2 LIGHTSPEED as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input7
  input: Logitech PRO X 2 LIGHTSPEED as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input8
  usb 3-2.1: 2:0: broken mixer GET_CUR (-18944/0/256 => -2662)
  usb 3-2.1: 6:0: broken mixer GET_CUR (-18944/0/256 => 0)

Changes in v2:
- Commmit message missed the version I compiled and tested it on.
- I forgot to add v2 to the patch.
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 0de7c9d94259..e038b5ccbcba 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2251,6 +2251,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 	DEVICE_FLG(0x046d, 0x0a8f, /* Logitech H390 headset */
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M |
 		   QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
+	DEVICE_FLG(0x046d, 0x0af7 /* Logitech PRO X 2 LIGHTSPEED */
+		   QUIRK_FLAG_MIXER_GET_CUR_BROKEN),
 	DEVICE_FLG(0x0499, 0x1506, /* Yamaha THR5 */
 		   QUIRK_FLAG_GENERIC_IMPLICIT_FB),
 	DEVICE_FLG(0x0499, 0x1509, /* Steinberg UR22 */

base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
-- 
2.55.0