linux-kernel - [PATCH] sound: usb: quirks: add quirk for Samsung USBC Headset (AKG)

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Message-ID: <1592910203-24035-1-git-send-email-macpaul.lin@mediatek.com>
Date:   Tue, 23 Jun 2020 19:03:23 +0800
From:   Macpaul Lin <macpaul.lin@...iatek.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alexander Tsoy <alexander@...y.me>,
        Jussi Laako <jussi@...arnerd.net>,
        Nick Kossifidis <mickflemm@...il.com>,
        Dmitry Panchenko <dmitry@...ystems.ee>,
        Chris Wulff <crwulff@...il.com>,
        Jesus Ramos <jesus-ramos@...e.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
CC:     Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul.lin@...iatek.com>,
        Macpaul Lin <macpaul.lin@...il.com>,
        <linux-usb@...r.kernel.org>,
        Chihhao Chen <chihhao.chen@...iatek.com>,
        <stable@...r.kernel.org>
Subject: [PATCH] sound: usb: quirks: add quirk for Samsung USBC Headset (AKG)

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
---
 sound/usb/quirks.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index bca0179..ebba29a 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1673,6 +1673,14 @@ 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);
 }
 
 /*
-- 
1.7.9.5