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[5.198.68.184]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-482c9c0bef5sm1901896f8f.31.2026.08.22.04.42.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Aug 2026 04:42:12 -0700 (PDT) From: Edward Blair To: linux-sound@vger.kernel.org Cc: perex@perex.cz, tiwai@suse.com, linux-kernel@vger.kernel.org, Edward Blair Subject: [PATCH] ALSA: usb-audio: Add quirk flags for SMSL USB DAC Date: Sat, 22 Aug 2026 12:41:10 +0100 Message-ID: <20260822114110.1069541-1-edward.blair@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The SMSL USB DAC with USB ID 152a:85dd produces an audible pop when snd-usb-audio performs its redundant probe-time interface setup. It also pops when returning from runtime suspend. Skip the probe-time interface setup and disable runtime autosuspend for this device. Both flags have been verified through the quirk_flags module parameter. Keep QUIRK_FLAG_DSD_RAW in the device entry because the exact match takes precedence over the generic 0x152a vendor entry from which the device currently inherits that flag. Signed-off-by: Edward Blair --- sound/usb/quirks.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index eb1750def..eca86b62c 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -2393,6 +2393,9 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { QUIRK_FLAG_IFB_SILENCE_ON_EMPTY), DEVICE_FLG(0x13e5, 0x0001, /* Serato Phono */ QUIRK_FLAG_IGNORE_CTL_ERROR), + DEVICE_FLG(0x152a, 0x85dd, /* SMSL USB DAC */ + QUIRK_FLAG_DSD_RAW | QUIRK_FLAG_DISABLE_AUTOSUSPEND | + QUIRK_FLAG_SKIP_IFACE_SETUP), DEVICE_FLG(0x152a, 0x880a, /* NeuralDSP Quad Cortex */ 0), /* Doesn't have the vendor quirk which would otherwise apply */ DEVICE_FLG(0x1532, 0x055e, /* Razer Nommo V2 X */ -- 2.55.0