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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 8CB4CC433ED for ; Mon, 19 Apr 2021 05:30:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5DFF161107 for ; Mon, 19 Apr 2021 05:30:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233620AbhDSF1w (ORCPT ); Mon, 19 Apr 2021 01:27:52 -0400 Received: from mga04.intel.com ([192.55.52.120]:44552 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229473AbhDSF1v (ORCPT ); Mon, 19 Apr 2021 01:27:51 -0400 IronPort-SDR: ya6AzH+K9CsXr/0OH2WCoJa/DLXfpM+DJVvJNamn78Cy4iF+h3B7vKOnTdi2jidgtptKEciqBM pDk+Ek5ojhfA== X-IronPort-AV: E=McAfee;i="6200,9189,9958"; a="193147297" X-IronPort-AV: E=Sophos;i="5.82,233,1613462400"; d="scan'208";a="193147297" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Apr 2021 22:27:21 -0700 IronPort-SDR: k9P6StV0RiSZa0lmn8oEu9RJBlXf11x55TwSqro0oc2XCxgyt1xWmSAYNJwvfBqBPt7ad8AlG5 94mTEl8EAO0Q== X-IronPort-AV: E=Sophos;i="5.82,233,1613462400"; d="scan'208";a="426370598" Received: from bard-ubuntu.sh.intel.com ([10.239.185.57]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Apr 2021 22:27:17 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, srinivas.kandagatla@linaro.org, rander.wang@linux.intel.com, hui.wang@canonical.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, bard.liao@intel.com Subject: [PATCH 1/4] soundwire: bus: only use CLOCK_STOP_MODE0 and fix confusions Date: Mon, 19 Apr 2021 13:27:00 +0800 Message-Id: <20210419052703.2782-2-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210419052703.2782-1-yung-chuan.liao@linux.intel.com> References: <20210419052703.2782-1-yung-chuan.liao@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pierre-Louis Bossart Existing devices and implementations only support the required CLOCK_STOP_MODE0. All the code related to CLOCK_STOP_MODE1 has not been tested and is highly questionable, with a clear confusion between CLOCK_STOP_MODE1 and the simple clock stop state machine. This patch removes all usages of CLOCK_STOP_MODE1 - which has no impact on any solution - and fixes the use of the simple clock stop state machine. The resulting code should be a lot more symmetrical and easier to maintain. Note that CLOCK_STOP_MODE1 is not supported in the SoundWire Device Class specification so it's rather unlikely that we need to re-add this mode later. Signed-off-by: Pierre-Louis Bossart Reviewed-by: Guennadi Liakhovetski Reviewed-by: Rander Wang Signed-off-by: Bard Liao --- drivers/soundwire/bus.c | 100 ++++++++++++++-------------------- include/linux/soundwire/sdw.h | 2 - 2 files changed, 40 insertions(+), 62 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index a9e0aa72654d..dc4033b6f2e9 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -821,26 +821,6 @@ static void sdw_modify_slave_status(struct sdw_slave *slave, mutex_unlock(&bus->bus_lock); } -static enum sdw_clk_stop_mode sdw_get_clk_stop_mode(struct sdw_slave *slave) -{ - enum sdw_clk_stop_mode mode; - - /* - * Query for clock stop mode if Slave implements - * ops->get_clk_stop_mode, else read from property. - */ - if (slave->ops && slave->ops->get_clk_stop_mode) { - mode = slave->ops->get_clk_stop_mode(slave); - } else { - if (slave->prop.clk_stop_mode1) - mode = SDW_CLK_STOP_MODE1; - else - mode = SDW_CLK_STOP_MODE0; - } - - return mode; -} - static int sdw_slave_clk_stop_callback(struct sdw_slave *slave, enum sdw_clk_stop_mode mode, enum sdw_clk_stop_type type) @@ -933,7 +913,6 @@ static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num) */ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) { - enum sdw_clk_stop_mode slave_mode; bool simple_clk_stop = true; struct sdw_slave *slave; bool is_slave = false; @@ -955,10 +934,8 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) /* Identify if Slave(s) are available on Bus */ is_slave = true; - slave_mode = sdw_get_clk_stop_mode(slave); - slave->curr_clk_stop_mode = slave_mode; - - ret = sdw_slave_clk_stop_callback(slave, slave_mode, + ret = sdw_slave_clk_stop_callback(slave, + SDW_CLK_STOP_MODE0, SDW_CLK_PRE_PREPARE); if (ret < 0) { dev_err(&slave->dev, @@ -966,22 +943,29 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) return ret; } - ret = sdw_slave_clk_stop_prepare(slave, - slave_mode, true); - if (ret < 0) { - dev_err(&slave->dev, - "pre-prepare failed:%d", ret); - return ret; - } - - if (slave_mode == SDW_CLK_STOP_MODE1) + /* Only prepare a Slave device if needed */ + if (!slave->prop.simple_clk_stop_capable) { simple_clk_stop = false; + + ret = sdw_slave_clk_stop_prepare(slave, + SDW_CLK_STOP_MODE0, + true); + if (ret < 0) { + dev_err(&slave->dev, + "pre-prepare failed:%d", ret); + return ret; + } + } } /* Skip remaining clock stop preparation if no Slave is attached */ if (!is_slave) return ret; + /* + * Don't wait for all Slaves to be ready if they follow the simple + * state machine + */ if (!simple_clk_stop) { ret = sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); @@ -998,17 +982,13 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) slave->status != SDW_SLAVE_ALERT) continue; - slave_mode = slave->curr_clk_stop_mode; + ret = sdw_slave_clk_stop_callback(slave, + SDW_CLK_STOP_MODE0, + SDW_CLK_POST_PREPARE); - if (slave_mode == SDW_CLK_STOP_MODE1) { - ret = sdw_slave_clk_stop_callback(slave, - slave_mode, - SDW_CLK_POST_PREPARE); - - if (ret < 0) { - dev_err(&slave->dev, - "post-prepare failed:%d", ret); - } + if (ret < 0) { + dev_err(&slave->dev, + "post-prepare failed:%d", ret); } } @@ -1059,7 +1039,6 @@ EXPORT_SYMBOL(sdw_bus_clk_stop); */ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) { - enum sdw_clk_stop_mode mode; bool simple_clk_stop = true; struct sdw_slave *slave; bool is_slave = false; @@ -1081,31 +1060,33 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) /* Identify if Slave(s) are available on Bus */ is_slave = true; - mode = slave->curr_clk_stop_mode; - - if (mode == SDW_CLK_STOP_MODE1) { - simple_clk_stop = false; - continue; - } - - ret = sdw_slave_clk_stop_callback(slave, mode, + ret = sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0, SDW_CLK_PRE_DEPREPARE); if (ret < 0) dev_warn(&slave->dev, "clk stop deprep failed:%d", ret); - ret = sdw_slave_clk_stop_prepare(slave, mode, - false); + /* Only de-prepare a Slave device if needed */ + if (!slave->prop.simple_clk_stop_capable) { + simple_clk_stop = false; - if (ret < 0) - dev_warn(&slave->dev, - "clk stop deprep failed:%d", ret); + ret = sdw_slave_clk_stop_prepare(slave, SDW_CLK_STOP_MODE0, + false); + + if (ret < 0) + dev_warn(&slave->dev, + "clk stop deprep failed:%d", ret); + } } /* Skip remaining clock stop de-preparation if no Slave is attached */ if (!is_slave) return 0; + /* + * Don't wait for all Slaves to be ready if they follow the simple + * state machine + */ if (!simple_clk_stop) sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM); @@ -1117,8 +1098,7 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) slave->status != SDW_SLAVE_ALERT) continue; - mode = slave->curr_clk_stop_mode; - sdw_slave_clk_stop_callback(slave, mode, + sdw_slave_clk_stop_callback(slave, SDW_CLK_STOP_MODE0, SDW_CLK_POST_DEPREPARE); } diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index ced07f8fde87..5d93d9949653 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -624,7 +624,6 @@ struct sdw_slave_ops { int (*port_prep)(struct sdw_slave *slave, struct sdw_prepare_ch *prepare_ch, enum sdw_port_prep_ops pre_ops); - int (*get_clk_stop_mode)(struct sdw_slave *slave); int (*clk_stop)(struct sdw_slave *slave, enum sdw_clk_stop_mode mode, enum sdw_clk_stop_type type); @@ -675,7 +674,6 @@ struct sdw_slave { struct list_head node; struct completion port_ready[SDW_MAX_PORTS]; unsigned int m_port_map[SDW_MAX_PORTS]; - enum sdw_clk_stop_mode curr_clk_stop_mode; u16 dev_num; u16 dev_num_sticky; bool probed; -- 2.17.1