From patchwork Thu Nov 14 18:16:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre-Louis Bossart X-Patchwork-Id: 11244231 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C5C7D14E5 for ; Thu, 14 Nov 2019 18:23:37 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 563552071B for ; Thu, 14 Nov 2019 18:23:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="C/bnMIrI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 563552071B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org 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 7C454168E; Thu, 14 Nov 2019 19:22:45 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 7C454168E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1573755815; bh=6+YeqGi/RVqo+9O94mHBaSl58d1W+x9KkbhLkZpkSzs=; h=From:To:Date:In-Reply-To:References:Cc:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=C/bnMIrIRPN2A2tOagUGZN+Lxv87g6DlZhdKKJWm+VlARtQtcg4hAzGh5Nr3dIuUa 6VfjwDfZ3oMIZU3igmFJvLcrOnjZAjjAZE9E588Ysz2PEx+VvrTeuAFmfpldOqxB5F HP6RvKvrTuW8PkOqMbbBIbB/zRp3TxUyEesMT+Ds= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 98268F8014A; Thu, 14 Nov 2019 19:18:13 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id C9188F80117; Thu, 14 Nov 2019 19:17:53 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=SPF_HELO_NONE,SPF_NONE, SURBL_BLOCKED,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (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 E5A86F800CC for ; Thu, 14 Nov 2019 19:17:45 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz E5A86F800CC X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Nov 2019 10:17:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,304,1569308400"; d="scan'208";a="195123462" Received: from chiahuil-mobl.amr.corp.intel.com (HELO pbossart-mobl3.amr.corp.intel.com) ([10.255.228.77]) by orsmga007.jf.intel.com with ESMTP; 14 Nov 2019 10:17:43 -0800 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Date: Thu, 14 Nov 2019 12:16:49 -0600 Message-Id: <20191114181702.22254-10-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191114181702.22254-1-pierre-louis.bossart@linux.intel.com> References: <20191114181702.22254-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Cc: Pierre-Louis Bossart , tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, Ranjani Sridharan , vkoul@kernel.org, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, slawomir.blauciak@intel.com, Sanyog Kale , Bard liao , Rander Wang Subject: [alsa-devel] [PATCH v3 09/22] soundwire: bus: add helper to reset Slave status to UNATTACHED 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" When resuming, we need to re-enumerate and restart from UNATTACHED. This will help implement a more robust state machine avoiding race conditions on resume. Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/bus.c | 24 ++++++++++++++++++++++++ drivers/soundwire/bus.h | 2 ++ 2 files changed, 26 insertions(+) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index d0461bb2fb86..b050a45d1745 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -1108,3 +1108,27 @@ int sdw_handle_slave_status(struct sdw_bus *bus, return ret; } EXPORT_SYMBOL(sdw_handle_slave_status); + +void sdw_clear_slave_status(struct sdw_bus *bus) +{ + struct sdw_slave *slave; + int i; + + /* Check all non-zero devices */ + for (i = 1; i <= SDW_MAX_DEVICES; i++) { + mutex_lock(&bus->bus_lock); + if (test_bit(i, bus->assigned) == false) { + mutex_unlock(&bus->bus_lock); + continue; + } + mutex_unlock(&bus->bus_lock); + + slave = sdw_get_slave(bus, i); + if (!slave) + continue; + + if (slave->status != SDW_SLAVE_UNATTACHED) + sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); + } +} +EXPORT_SYMBOL(sdw_clear_slave_status); diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index 93e7bbab0938..4e6fb5d2f5cc 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -167,4 +167,6 @@ sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val) return sdw_write(slave, addr, tmp); } +void sdw_clear_slave_status(struct sdw_bus *bus); + #endif /* __SDW_BUS_H */