From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 095653FE357; Thu, 16 Jul 2026 13:58:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210307; cv=none; b=HAYxRSi6xCfz4rub0p8yHDOIFVJJpW+MFnhvM3u2TlXjvZUqkjwr0OZM9yMBu05yCYcSL2zlglTCbX9UHctswU6S8R9O7UriA8h+szV1mVts/wscucqq0TPRrrTdCtyH7Jn9TZaYt88c/+t1LEtT/r06ppe0ziaOVKbUj4vpcFQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784210307; c=relaxed/simple; bh=lbUrvx98TdN8SwgzF4EdM0mS6s494PhIbr16+SBNa+M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sq5PuelBvrRCRUw9fQ+0Trw9wKm2VrPM8IBcCoxh5rkyg5dP/Tg6vMFHEu4l/nd2IaaujhzkQJlpDCtFxKW/pbXmFA86wEKRZhjcbrcMXv1SxYI6DgrR6cuKXJYADgB+abXd94TrXEyi5BbR9ec14SI5xzBvSwgy2arXugkG09I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2SB4kFo/; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2SB4kFo/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7005A1F000E9; Thu, 16 Jul 2026 13:58:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784210305; bh=EdhGIANJNqArmo0NoPVC5xH/Tp6WuSL7Adixf+G3hVQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=2SB4kFo//HNlkFYnL2Bm8R0lZ/lcVi+xy46QK5Mzj57dsx0bMU8shhseXbh/4hTbw zwZFFhavCXaUVoqUW5VJEgZUZraLGXBAB0Sz+Bfh4n6ucAIE7OutaqiuWv8ba6aEWF VLA2bB9M0kO/8WRjB45Eu7SyCkKNx8jjbpvGoxpA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Rong Zhang , Takashi Iwai Subject: [PATCH 7.1 516/518] ALSA: doc: usb-audio: Add doc for QUIRK_FLAG_IFB_SILENCE_ON_EMPTY Date: Thu, 16 Jul 2026 15:33:04 +0200 Message-ID: <20260716133059.129888530@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133047.772246337@linuxfoundation.org> References: <20260716133047.772246337@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rong Zhang commit 06363f96e3d6b54ff7b5d2ce85cab95bd5e874b0 upstream. QUIRK_FLAG_IFB_SILENCE_ON_EMPTY was introduced into usb-audio before without appropriate documentation, so add it. Fixes: a23812004228 ("ALSA: usb-audio: add IFB_SILENCE_ON_EMPTY quirk for Behringer Flow 8") Signed-off-by: Rong Zhang Link: https://patch.msgid.link/20260527-uac-quirk-get-cur-vol-v1-1-e9362b712e5e@rong.moe Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- Documentation/sound/alsa-configuration.rst | 6 ++++++ 1 file changed, 6 insertions(+) --- a/Documentation/sound/alsa-configuration.rst +++ b/Documentation/sound/alsa-configuration.rst @@ -2383,6 +2383,12 @@ quirk_flags ``V(x) = k * x``; ``dB(x) = 20 * log10(x)``. Overrides bit 24 * bit 28: ``mixer_capture_linear_vol`` Similar to bit 27 but for capture streams. Overrides bit 25 + * bit 29: ``ifb_silence_on_empty`` + In implicit feedback mode, when an entire capture URB returns with + all iso_frame_desc[i].status != 0 (bytes==0), do not silently return + from snd_usb_handle_sync_urb. Instead fall through and enqueue a + packet_info containing only size-0 packets, so the OUT ring keeps + moving (emits silence). Needed by Behringer Flow 8 (1397:050c). This module supports multiple devices, autoprobe and hotplugging.