From nobody Mon Feb 9 17:34:51 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 1AB39C77B75 for ; Mon, 15 May 2023 06:51:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240273AbjEOGu7 (ORCPT ); Mon, 15 May 2023 02:50:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240170AbjEOGus (ORCPT ); Mon, 15 May 2023 02:50:48 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7CDE72699 for ; Sun, 14 May 2023 23:50:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1684133438; x=1715669438; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=xKsOmGgpfRTaoYi/C0Rex9lD4JYFMvLzVqkjtEvqo9k=; b=G9lxGxSw372a26MCw7DfcNPWonstBGIqWG1Rvv0liJ+h1tginpiDrVKY YVbasQqng62u0zT33XIEtAB/KoJdN1goq3YFListrqGYT/EXNoVOUXSd7 h5dtdFVl2wETI1ymY1yQZdmFlf9OZ7XejBMVJzQIUXzWWuHN7HxIeNbsE ZkU0Fh/z3/OAjzSZZGfaxxLkC0X4uaXMGwjdaDZYbQb/wn0qbIANCRzif 3Br/5IVqnsF+fZkoHINikTUfsLZg1n/yACQmO5PPvT/lToI1/NIZHfnA2 LuLlKa0jj/LGI8Q3s7DeOg98iBh0o1s3cLbmR32f37Xq14AV3qMytz13a A==; X-IronPort-AV: E=McAfee;i="6600,9927,10710"; a="349966331" X-IronPort-AV: E=Sophos;i="5.99,275,1677571200"; d="scan'208";a="349966331" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 May 2023 23:50:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10710"; a="694908641" X-IronPort-AV: E=Sophos;i="5.99,275,1677571200"; d="scan'208";a="694908641" Received: from bard-ubuntu.sh.intel.com ([10.239.185.57]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 May 2023 23:50:35 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org, broonie@kernel.org, tiwai@suse.de Cc: linux-kernel@vger.kernel.org, vinod.koul@linaro.org, pierre-louis.bossart@linux.intel.com, bard.liao@intel.com Subject: [PATCH v2 07/26] soundwire: intel: add eml_lock in the interface for new platforms Date: Mon, 15 May 2023 15:10:23 +0800 Message-Id: <20230515071042.2038-8-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230515071042.2038-1-yung-chuan.liao@linux.intel.com> References: <20230515071042.2038-1-yung-chuan.liao@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pierre-Louis Bossart In existing Intel/SoundWire systems, all the SoundWire configuration is 'self-contained', with the 'shim_lock' mutex used to protect access to shared registers in multi-link configurations. With the move of part of the SoundWire registers to the HDaudio multi-link structure, we need a unified lock. The hda-mlink implementation provides an 'eml_lock' that is used to protect shared registers such as LCTL and LSYNC, we can pass it to the SoundWire side. There is no issue with possible dangling pointers since the SoundWire auxiliary devices are children of the PCI device, so the 'eml_lock' cannot be removed while the SoundWire side is in use. This patch only adds the interface for now. Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Reviewed-by: P=C3=A9ter Ujfalusi Reviewed-by: Ranjani Sridharan Signed-off-by: Bard Liao --- include/linux/soundwire/sdw_intel.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/= sdw_intel.h index c4281aa06e2e..bafc6f2554b0 100644 --- a/include/linux/soundwire/sdw_intel.h +++ b/include/linux/soundwire/sdw_intel.h @@ -327,6 +327,8 @@ struct sdw_intel_ctx { * @alh_base: sdw alh base. * @ext: extended HDaudio link support * @hbus: hdac_bus pointer, needed for power management + * @eml_lock: mutex protecting shared registers in the HDaudio multi-link + * space */ struct sdw_intel_res { const struct sdw_intel_hw_ops *hw_ops; @@ -343,6 +345,7 @@ struct sdw_intel_res { u32 alh_base; bool ext; struct hdac_bus *hbus; + struct mutex *eml_lock; }; =20 /* --=20 2.25.1