From patchwork Wed Aug 24 16:07:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Martin_Povi=C5=A1er?= X-Patchwork-Id: 12953788 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 529C8C32796 for ; Wed, 24 Aug 2022 16:09:09 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id E9D6C886; Wed, 24 Aug 2022 18:08:16 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz E9D6C886 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1661357347; bh=Wm/adu6xjbz51kq2laJgj6EkvU0AxmsJM1gyMjEOpyA=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=cgULiJtsC9nPOyXNimL05QbMewc4PmBd2704aM+KWG8FtQ++pOlorCsHdroMSsbfq BXezfniOplS/SJALYGRcOvFg+ORqGBGG4OIZNetdYuVwd76qEt31VHqzT2vpRvrG6/ zNjteHZGd1QJMJLkBxyAAea3VoUmTC4PwXl/EsGI= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 1E0E0F80529; Wed, 24 Aug 2022 18:07:30 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 3966BF80528; Wed, 24 Aug 2022 18:07:28 +0200 (CEST) Received: from hutie.ust.cz (hutie.ust.cz [185.8.165.127]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id E547AF804BD for ; Wed, 24 Aug 2022 18:07:20 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz E547AF804BD Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=cutebit.org header.i=@cutebit.org header.b="Bxm61ZEy" From: =?utf-8?q?Martin_Povi=C5=A1er?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cutebit.org; s=mail; t=1661357240; bh=aO38GJDIP/5aJG6S0vIu2Re6vO0yDujEU8aBKTpUOoc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Bxm61ZEynvpzn8cGD8yFgOWSblB7WYZYp8swzU6lksYgeFKL2Psl7tZMrQrQOgrEo o3qi86pna0Z+tnErdiyTmXsRMS6yaSjPN4brbS0SN8OLPzluwbGpU2uGRLSkfoeim0 6HGwKNyD5af9aDowtXFhKbnpOaCQnNKr6itIwkgM= To: =?utf-8?q?Martin_Povi=C5=A1er?= , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Hector Martin , Sven Peter , Philipp Zabel Subject: [PATCH v3 4/4] ASoC: apple: mca: Add locking Date: Wed, 24 Aug 2022 18:07:15 +0200 Message-Id: <20220824160715.95779-5-povik+lin@cutebit.org> In-Reply-To: <20220824160715.95779-1-povik+lin@cutebit.org> References: <20220824160715.95779-1-povik+lin@cutebit.org> MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org, asahi@lists.linux.dev, Alyssa Rosenzweig , linux-kernel@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" In DAI ops, accesses to the native cluster (of the DAI), and to data of clusters related to it by a DPCM frontend-backend link, should have been synchronized by the 'pcm_mutex' lock at ASoC level. What is not covered are the 'port_driver' accesses on foreign clusters to which the current cluster has no a priori relation, so fill in locking for that. (This should only matter in bizarre configurations of sharing one MCA peripheral between ASoC cards.) Signed-off-by: Martin PoviĊĦer --- sound/soc/apple/mca.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/sound/soc/apple/mca.c b/sound/soc/apple/mca.c index 807b85469408..aa67d57c9a9b 100644 --- a/sound/soc/apple/mca.c +++ b/sound/soc/apple/mca.c @@ -158,6 +158,9 @@ struct mca_data { struct reset_control *rstc; struct device_link *pd_link; + /* Mutex for accessing port_driver of foreign clusters */ + struct mutex port_mutex; + int nclusters; struct mca_cluster clusters[]; }; @@ -296,16 +299,21 @@ static bool mca_fe_clocks_in_use(struct mca_cluster *cl) struct mca_cluster *be_cl; int stream, i; + mutex_lock(&mca->port_mutex); for (i = 0; i < mca->nclusters; i++) { be_cl = &mca->clusters[i]; if (be_cl->port_driver != cl->no) continue; - for_each_pcm_streams(stream) - if (be_cl->clocks_in_use[stream]) + for_each_pcm_streams(stream) { + if (be_cl->clocks_in_use[stream]) { + mutex_unlock(&mca->port_mutex); return true; + } + } } + mutex_unlock(&mca->port_mutex); return false; } @@ -349,6 +357,11 @@ static int mca_be_hw_free(struct snd_pcm_substream *substream, if (cl->port_driver < 0) return -EINVAL; + /* + * We are operating on a foreign cluster here, but since we + * belong to the same PCM, accesses should have been + * synchronized at ASoC level. + */ fe_cl = &mca->clusters[cl->port_driver]; if (!mca_fe_clocks_in_use(fe_cl)) return 0; /* Nothing to do */ @@ -721,7 +734,9 @@ static int mca_be_startup(struct snd_pcm_substream *substream, cl->base + REG_PORT_CLOCK_SEL); writel_relaxed(PORT_DATA_SEL_TXA(fe_cl->no), cl->base + REG_PORT_DATA_SEL); + mutex_lock(&mca->port_mutex); cl->port_driver = fe_cl->no; + mutex_unlock(&mca->port_mutex); cl->port_started[substream->stream] = true; return 0; @@ -731,6 +746,7 @@ static void mca_be_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct mca_cluster *cl = mca_dai_to_cluster(dai); + struct mca_data *mca = cl->host; cl->port_started[substream->stream] = false; @@ -741,7 +757,9 @@ static void mca_be_shutdown(struct snd_pcm_substream *substream, */ writel_relaxed(0, cl->base + REG_PORT_ENABLES); writel_relaxed(0, cl->base + REG_PORT_DATA_SEL); + mutex_lock(&mca->port_mutex); cl->port_driver = -1; + mutex_unlock(&mca->port_mutex); } } @@ -962,6 +980,7 @@ static int apple_mca_probe(struct platform_device *pdev) return -ENOMEM; mca->dev = &pdev->dev; mca->nclusters = nclusters; + mutex_init(&mca->port_mutex); platform_set_drvdata(pdev, mca); clusters = mca->clusters;