linux-kernel - [PATCH 5.4 044/178] ALSA: usb-audio: add quirk for Samsung USBC Headset (AKG)

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Date:   Mon, 29 Jun 2020 11:23:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Macpaul Lin <macpaul.lin@...iatek.com>,
        Chihhao Chen <chihhao.chen@...iatek.com>,
        Takashi Iwai <tiwai@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 5.4 044/178] ALSA: usb-audio: add quirk for Samsung USBC Headset (AKG)

From: Macpaul Lin <macpaul.lin@...iatek.com>

commit a32a1fc99807244d920d274adc46ba04b538cc8a upstream.

We've found Samsung USBC Headset (AKG) (VID: 0x04e8, PID: 0xa051)
need a tiny delay after each class compliant request.
Otherwise the device might not be able to be recognized each times.

Signed-off-by: Chihhao Chen <chihhao.chen@...iatek.com>
Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/1592910203-24035-1-git-send-email-macpaul.lin@mediatek.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/usb/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index eb3da0b71269c..bf5083a20b6d5 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1603,6 +1603,14 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 	     chip->usb_id == USB_ID(0x0951, 0x16ad)) &&
 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		usleep_range(1000, 2000);
+
+	/*
+	 * Samsung USBC Headset (AKG) need a tiny delay after each
+	 * class compliant request. (Model number: AAM625R or AAM627R)
+	 */
+	if (chip->usb_id == USB_ID(0x04e8, 0xa051) &&
+	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
+		usleep_range(5000, 6000);
 }
 
 /*
-- 
2.25.1