linux-kernel - [PATCH AUTOSEL 6.0 41/44] ALSA: usb-audio: add quirk to fix Hamedal C20 disconnect issue

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Message-Id: <20221119021124.1773699-41-sashal@kernel.org>
Date:   Fri, 18 Nov 2022 21:11:21 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ai Chao <aichao@...inos.cn>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>, perex@...ex.cz,
        tiwai@...e.com, ubizjak@...il.com, wanjiabing@...o.com,
        sdoregor@...re.me, connerknoxpublic@...il.com, cyrozap@...il.com,
        jussi@...arnerd.net, john-linux@...ago.org.uk, bp@...e.de,
        alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.0 41/44] ALSA: usb-audio: add quirk to fix Hamedal C20 disconnect issue

From: Ai Chao <aichao@...inos.cn>

[ Upstream commit bf990c10231937c0f51e5da5558e08cf5adc6a78 ]

For Hamedal C20, the current rate is different from the runtime rate,
snd_usb_endpoint stop and close endpoint to resetting rate.
if snd_usb_endpoint close the endpoint, sometimes usb will
disconnect the device.

Signed-off-by: Ai Chao <aichao@...inos.cn>
Link: https://lore.kernel.org/r/20221110063452.295110-1-aichao@kylinos.cn
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/usb/endpoint.c | 3 ++-
 sound/usb/quirks.c   | 2 ++
 sound/usb/usbaudio.h | 3 +++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 2420dc994632..4c9ea13f72d4 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -923,7 +923,8 @@ void snd_usb_endpoint_close(struct snd_usb_audio *chip,
 	usb_audio_dbg(chip, "Closing EP 0x%x (count %d)\n",
 		      ep->ep_num, ep->opened);
 
-	if (!--ep->iface_ref->opened)
+	if (!--ep->iface_ref->opened &&
+		!(chip->quirk_flags & QUIRK_FLAG_IFACE_SKIP_CLOSE))
 		endpoint_set_interface(chip, ep, false);
 
 	if (!--ep->opened) {
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index eadac586bcc8..a50e15be1229 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2185,6 +2185,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_GENERIC_IMPLICIT_FB),
 	DEVICE_FLG(0x2b53, 0x0031, /* Fiero SC-01 (firmware v1.1.0) */
 		   QUIRK_FLAG_GENERIC_IMPLICIT_FB),
+	DEVICE_FLG(0x0525, 0xa4ad, /* Hamedal C20 usb camero */
+		   QUIRK_FLAG_IFACE_SKIP_CLOSE),
 
 	/* Vendor matches */
 	VENDOR_FLG(0x045e, /* MS Lifecam */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 2c6575029b1c..e97141ef730a 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -170,6 +170,8 @@ extern bool snd_usb_skip_validation;
  *  Apply the generic implicit feedback sync mode (same as implicit_fb=1 option)
  * QUIRK_FLAG_SKIP_IMPLICIT_FB
  *  Don't apply implicit feedback sync mode
+ * QUIRK_FLAG_IFACE_SKIP_CLOSE
+ *  Don't closed interface during setting sample rate
  */
 
 #define QUIRK_FLAG_GET_SAMPLE_RATE	(1U << 0)
@@ -191,5 +193,6 @@ extern bool snd_usb_skip_validation;
 #define QUIRK_FLAG_SET_IFACE_FIRST	(1U << 16)
 #define QUIRK_FLAG_GENERIC_IMPLICIT_FB	(1U << 17)
 #define QUIRK_FLAG_SKIP_IMPLICIT_FB	(1U << 18)
+#define QUIRK_FLAG_IFACE_SKIP_CLOSE	(1U << 19)
 
 #endif /* __USBAUDIO_H */
-- 
2.35.1