From nobody Fri Jan 2 18:50:54 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9283CE95A96 for ; Mon, 9 Oct 2023 15:34:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376776AbjJIPee (ORCPT ); Mon, 9 Oct 2023 11:34:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376478AbjJIPec (ORCPT ); Mon, 9 Oct 2023 11:34:32 -0400 Received: from mx0b-001ae601.pphosted.com (mx0a-001ae601.pphosted.com [67.231.149.25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D315A8F for ; Mon, 9 Oct 2023 08:34:31 -0700 (PDT) Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 3998HnwY015992; Mon, 9 Oct 2023 10:34:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h= from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding:content-type; s=PODMain02222019; bh=Y F8GMFdoqe5hznvMm3y2/t2RPeHrqis4CldRU1rABgw=; b=QsaUCaqh1Wbzs/Jt3 f+uizHqbTqVVG/3d3v3SYpbStO7gPr7zGJVJxmc4dnjHj2wXE1MrekR9+7+wzy0g 9/6u/eF+q0s7KcltCJjoWflfX16EdKiuqFPN30k9WVg+x9OOUNekPs0nmeEntNGN ySUion/ca1y/+EEEvjC5MnQ3fmwUx+liiE+7/rK6cnOrpGwLDGUEJrlUgjqF/feW mbGtAOTGWv6P9+n5nj45KDhGFX8N3NbbvALLcNqBKr5l9YhfZeTc7gsyEw9v5sGa 5QXEhl4OMq9X7cLxgw4py+XszGF0NcoTb531AV8nbSSHVeE4XTDKBwBN8j/fC6zJ 8mXnQ== Received: from ediex02.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3tkhkc1tyh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 09 Oct 2023 10:34:18 -0500 (CDT) Received: from ediex01.ad.cirrus.com (198.61.84.80) by ediex02.ad.cirrus.com (198.61.84.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.37; Mon, 9 Oct 2023 16:34:16 +0100 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by ediex01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.2.1118.37 via Frontend Transport; Mon, 9 Oct 2023 16:34:16 +0100 Received: from EDIN4L06LR3.ad.cirrus.com (EDIN4L06LR3.ad.cirrus.com [198.61.65.230]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id B14D5B06; Mon, 9 Oct 2023 15:34:15 +0000 (UTC) From: Richard Fitzgerald To: CC: , , , Richard Fitzgerald Subject: [PATCH] ASoC: cs35l56: ASP1 DOUT must default to Hi-Z when not transmitting Date: Mon, 9 Oct 2023 16:34:12 +0100 Message-ID: <20231009153412.30380-1-rf@opensource.cirrus.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: etGRMJSsjEDt_F24RyJ-U4IEtwZvHZzI X-Proofpoint-GUID: etGRMJSsjEDt_F24RyJ-U4IEtwZvHZzI X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The ASP1 DOUT line must be defaulted to be high-impedance when it is not actually transmitting data for an active channel. In non-SoundWire modes ASP1 will usually be shared by multiple amps so each amp must only drive the line during the slot for an enabled TX channel. In SoundWire mode a custom firmware can use ASP1 as a secondary chip-to-chip audio link or as GPIO. It should be defaulted to high-impedance since by default the purpose of this pin is not known. Backport note: On kernel versions before 6.6 the cs35l56->base.regmap argument to regmap_set_bits() must be changed to cs35l56->regmap. Signed-off-by: Richard Fitzgerald Fixes: e49611252900 ("ASoC: cs35l56: Add driver for Cirrus Logic CS35L56") --- sound/soc/codecs/cs35l56.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sound/soc/codecs/cs35l56.c b/sound/soc/codecs/cs35l56.c index 8ccdd3f134a5..45b4de3eff94 100644 --- a/sound/soc/codecs/cs35l56.c +++ b/sound/soc/codecs/cs35l56.c @@ -1197,6 +1197,12 @@ int cs35l56_init(struct cs35l56_private *cs35l56) /* Registers could be dirty after soft reset or SoundWire enumeration */ regcache_sync(cs35l56->base.regmap); =20 + /* Set ASP1 DOUT to high-impedance when it is not transmitting audio data= . */ + ret =3D regmap_set_bits(cs35l56->base.regmap, CS35L56_ASP1_CONTROL3, + CS35L56_ASP1_DOUT_HIZ_CTRL_MASK); + if (ret) + return dev_err_probe(cs35l56->base.dev, ret, "Failed to write ASP1_CONTR= OL3\n"); + cs35l56->base.init_done =3D true; complete(&cs35l56->init_completion); =20 --=20 2.30.2