From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 663FAC10F29 for ; Tue, 17 Mar 2020 16:34:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45F0320735 for ; Tue, 17 Mar 2020 16:34:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726697AbgCQQeQ (ORCPT ); Tue, 17 Mar 2020 12:34:16 -0400 Received: from mga06.intel.com ([134.134.136.31]:47605 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726066AbgCQQeO (ORCPT ); Tue, 17 Mar 2020 12:34:14 -0400 IronPort-SDR: W8cJvy6K8Pg5muopLI/hQYNbmrgw3pcuqH4Ngm3s6g7atwVqgx+e2/tm5rM6D/y0OYFYhG2n/O PoN+NGQfPgmw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Mar 2020 09:34:14 -0700 IronPort-SDR: 9Sh7qCZdtwQavnDgqSRizJyeLKpbru1aoWPI5pNznFIT7CefrBg8og90MV2U/ATKZZ6bUMT+hY SmZce7yrMGmg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,565,1574150400"; d="scan'208";a="244533129" Received: from aavila-mobl1.amr.corp.intel.com (HELO pbossart-mobl3.amr.corp.intel.com) ([10.255.36.39]) by orsmga003.jf.intel.com with ESMTP; 17 Mar 2020 09:34:11 -0700 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, vkoul@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com, Bard liao , Rander Wang , Ranjani Sridharan , Hui Wang , Rander Wang , Pierre-Louis Bossart , Sanyog Kale Subject: [PATCH v2 03/17] soundwire: cadence: add interface to check clock status Date: Tue, 17 Mar 2020 11:33:15 -0500 Message-Id: <20200317163329.25501-4-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200317163329.25501-1-pierre-louis.bossart@linux.intel.com> References: <20200317163329.25501-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rander Wang If master is in clock stop state, driver can't modify registers in master except the registers for clock stop setting. Signed-off-by: Rander Wang Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/cadence_master.c | 11 +++++++++++ drivers/soundwire/cadence_master.h | 2 ++ 2 files changed, 13 insertions(+) diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 941809ea00a8..1bfdc1d4fcb1 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -1207,6 +1207,17 @@ static const struct sdw_master_port_ops cdns_port_ops = { .dpn_port_enable_ch = cdns_port_enable, }; +/** + * sdw_cdns_is_clock_stop: Check clock status + * + * @cdns: Cadence instance + */ +bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns) +{ + return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP); +} +EXPORT_SYMBOL(sdw_cdns_is_clock_stop); + /** * sdw_cdns_probe() - Cadence probe routine * @cdns: Cadence instance diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index 44e802bba702..691faa386889 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -144,6 +144,8 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns, int sdw_cdns_exit_reset(struct sdw_cdns *cdns); int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state); +bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns); + #ifdef CONFIG_DEBUG_FS void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root); #endif -- 2.20.1