linux-kernel - [PATCH AUTOSEL 4.4 004/174] ALSA: usb-audio: update quirk for B&W PX to remove microphone

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Date:   Thu, 16 Jan 2020 12:40:01 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicolas Huaman <nicolas@...ochao.de>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 4.4 004/174] ALSA: usb-audio: update quirk for B&W PX to remove microphone

From: Nicolas Huaman <nicolas@...ochao.de>

[ Upstream commit c369c8db15d51fa175d2ba85928f79d16af6b562 ]

A quirk in snd-usb-audio was added to automate setting sample rate to
4800k and remove the previously exposed nonfunctional microphone for
the Bowers & Wilkins PX:
commit 240a8af929c7c57dcde28682725b29cf8474e8e5
https://lore.kernel.org/patchwork/patch/919689/

However the headphones where updated shortly after that to remove the
unintentional microphone functionality. I guess because of this the
headphones now crash when connecting them via USB while the quirk is
active. Dmesg:

snd-usb-audio: probe of 2-3:1.0 failed with error -22
usb 2-3: 2:1: cannot get min/max values for control 2 (id 2)

This patch removes the microfone and allows the headphones to connect
and work out of the box. It is based on the current mainline kernel
 and successfully applied an tested on my machine (4.18.10.arch1-1).

Fixes: 240a8af929c7 ("ALSA: usb-audio: Add a quirck for B&W PX headphones")
Signed-off-by: Nicolas Huaman <nicolas@...ochao.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/usb/quirks-table.h | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index d32727c74a16..c892b4d1e733 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3293,19 +3293,14 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
 				.ifnum = 0,
 				.type = QUIRK_AUDIO_STANDARD_MIXER,
 			},
-			/* Capture */
-			{
-				.ifnum = 1,
-				.type = QUIRK_IGNORE_INTERFACE,
-			},
 			/* Playback */
 			{
-				.ifnum = 2,
+				.ifnum = 1,
 				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
 				.data = &(const struct audioformat) {
 					.formats = SNDRV_PCM_FMTBIT_S16_LE,
 					.channels = 2,
-					.iface = 2,
+					.iface = 1,
 					.altsetting = 1,
 					.altset_idx = 1,
 					.attributes = UAC_EP_CS_ATTR_FILL_MAX |
-- 
2.20.1