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=-10.6 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 00F86C433E6 for ; Fri, 26 Feb 2021 17:47:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0E6664F1F for ; Fri, 26 Feb 2021 17:47:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230128AbhBZRr3 (ORCPT ); Fri, 26 Feb 2021 12:47:29 -0500 Received: from mga09.intel.com ([134.134.136.24]:6509 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229967AbhBZRrZ (ORCPT ); Fri, 26 Feb 2021 12:47:25 -0500 IronPort-SDR: VjmcFmXCyoDfSxCwfRUIoY7V9svM4oK3K7OP6IO9FOFQ9JQjtVMZl7N2531vaN1rcRtJbFi1Lh drRw2D1eZA1g== X-IronPort-AV: E=McAfee;i="6000,8403,9907"; a="186066745" X-IronPort-AV: E=Sophos;i="5.81,209,1610438400"; d="scan'208";a="186066745" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2021 09:45:39 -0800 IronPort-SDR: Y0GiQagDo5GTv1ZbQ03rpUeN62xAuAnWazm1QzYWLEEBE5IEnu7+iFEmPfDYwUlwJYTFCKD63S b7lsREAmef/w== X-IronPort-AV: E=Sophos;i="5.81,209,1610438400"; d="scan'208";a="432857280" Received: from esnyder-desk.amr.corp.intel.com (HELO [10.255.230.205]) ([10.255.230.205]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2021 09:45:38 -0800 From: Pierre-Louis Bossart Subject: Re: [PATCH 2/3] soundwire: qcom: add auto enumeration support To: Srinivas Kandagatla , vkoul@kernel.org Cc: yung-chuan.liao@linux.intel.com, sanyog.r.kale@intel.com, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org References: <20210226170250.9067-1-srinivas.kandagatla@linaro.org> <20210226170250.9067-3-srinivas.kandagatla@linaro.org> Message-ID: <0c551b23-7ed4-59d7-72c2-284bdf8584f1@linux.intel.com> Date: Fri, 26 Feb 2021 11:44:06 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210226170250.9067-3-srinivas.kandagatla@linaro.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > +static int qcom_swrm_enumerate(struct sdw_bus *bus) > +{ > + struct qcom_swrm_ctrl *ctrl = to_qcom_sdw(bus); > + struct sdw_slave *slave, *_s; > + struct sdw_slave_id id; > + u32 val1, val2; > + u64 addr; > + int i; > + char *buf1 = (char *)&val1, *buf2 = (char *)&val2; > + > + for (i = 1; i < (SDW_MAX_DEVICES + 1); i++) { I don't understand the (SDW_MAX_DEVICES + 1)? > + /*SCP_Devid5 - Devid 4*/ > + ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_1(i), &val1); > + > + /*SCP_Devid3 - DevId 2 Devid 1 Devid 0*/ > + ctrl->reg_read(ctrl, SWRM_ENUMERATOR_SLAVE_DEV_ID_2(i), &val2); Do you mind explaining a bit what happens here? Does the hardware issue commands to read all DevID registers and set the device number automagically? If yes, then in SoundWire parlance the enumeration is complete. What you are doing below is no longer part of the enumeration. > + > + if (!val1 && !val2) > + break; > + > + addr = buf2[1] | (buf2[0] << 8) | (buf1[3] << 16) | > + ((u64)buf1[2] << 24) | ((u64)buf1[1] << 32) | > + ((u64)buf1[0] << 40); > + > + sdw_extract_slave_id(bus, addr, &id); > + /* Now compare with entries */ > + list_for_each_entry_safe(slave, _s, &bus->slaves, node) { > + if (sdw_compare_devid(slave, id) == 0) { > + u32 status = qcom_swrm_get_n_device_status(ctrl, i); > + if (status == SDW_SLAVE_ATTACHED) { > + slave->dev_num = i; > + mutex_lock(&bus->bus_lock); > + set_bit(i, bus->assigned); > + mutex_unlock(&bus->bus_lock); > + > + } And that part is strange as well. The bus->assigned bit should be set even if the Slave is not in the list provided by platform firmware. It's really tracking the state of the hardware, and it should not be influenced by what software knows to manage. > + break; > + } > + } > + } > + > + complete(&ctrl->enumeration); you have init_completion() and complete() in this patch, but no wait_for_completion(), so that should be added in a later patch, no? > + return 0; > +} > + > static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id) > { > struct qcom_swrm_ctrl *swrm = dev_id; > - u32 value, intr_sts, intr_sts_masked; > + u32 value, intr_sts, intr_sts_masked, slave_status; > u32 i; > u8 devnum = 0; > int ret = IRQ_HANDLED; > @@ -382,10 +443,19 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id) > break; > case SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED: > case SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS: > - dev_err_ratelimited(swrm->dev, "%s: SWR new slave attached\n", > + dev_err_ratelimited(swrm->dev, "%s: SWR slave status changed\n", > __func__); > - qcom_swrm_get_device_status(swrm); > - sdw_handle_slave_status(&swrm->bus, swrm->status); > + swrm->reg_read(swrm, SWRM_MCP_SLV_STATUS, &slave_status); > + if (swrm->slave_status == slave_status) { > + dev_err(swrm->dev, "Slave status not changed %x\n", > + slave_status); > + break; > + } else { > + dev_err(swrm->dev, "Slave status handle %x\n", slave_status); > + qcom_swrm_get_device_status(swrm); > + qcom_swrm_enumerate(&swrm->bus); > + sdw_handle_slave_status(&swrm->bus, swrm->status); > + } > break; > case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET: > dev_err_ratelimited(swrm->dev, > @@ -472,8 +542,8 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl) > > ctrl->reg_write(ctrl, SWRM_MCP_FRAME_CTRL_BANK_ADDR(0), val); > > - /* Disable Auto enumeration */ > - ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 0); > + /* Enable Auto enumeration */ > + ctrl->reg_write(ctrl, SWRM_ENUMERATOR_CFG_ADDR, 1); > > ctrl->intr_mask = SWRM_INTERRUPT_STATUS_RMSK; > /* Mask soundwire interrupts */ > @@ -507,6 +577,7 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl) > ctrl->reg_write(ctrl, SWRM_INTERRUPT_CPU_EN, > SWRM_INTERRUPT_STATUS_RMSK); > } > + ctrl->slave_status = 0; > return 0; > } > > @@ -1068,6 +1139,7 @@ static int qcom_swrm_probe(struct platform_device *pdev) > dev_set_drvdata(&pdev->dev, ctrl); > mutex_init(&ctrl->port_lock); > init_completion(&ctrl->broadcast); > + init_completion(&ctrl->enumeration); > > ctrl->bus.ops = &qcom_swrm_ops; > ctrl->bus.port_ops = &qcom_swrm_port_ops; >