From nobody Fri Sep 12 15:14:55 2025 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 14B86C7EE31 for ; Thu, 25 May 2023 13:39:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241369AbjEYNjE (ORCPT ); Thu, 25 May 2023 09:39:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241202AbjEYNi4 (ORCPT ); Thu, 25 May 2023 09:38:56 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6F35197 for ; Thu, 25 May 2023 06:38:51 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id ffacd0b85a97d-3093a778089so1414132f8f.1 for ; Thu, 25 May 2023 06:38:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685021930; x=1687613930; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=0e4d294AXuwEBJZs4agoGK3jhgST3++yYamvsMPJTfc=; b=enk4tTOQPqyHhGGVUkh9wjJsA+DGP6BHKoVWWDAlaJEvZCUrr23mZ+YlG9L5sjUQjQ GEbt9AUjp5qgBY+RhmWKG3vK5BHzOlewlsaGRCa3wk5O5rFzoe9gn5CfCObtYlzoG9dq Mt0xwQH5Qa6wKEBBKGo6mrCCfEFHuGI0HUipri/Op0kJkA5JrBfnIxFtu6upGjumZ6rO JEXdo73k+YDPY5oQTEVGWGPllS34akWbHkst6za7pkb8f55CmRUBcWPgor7mkJEv5WVa mZgY1O/guESCD+AxM6rKPYsbU191IRl2aQjtVQbwqFPG+vc64TJcGKiDZ97dhvLasFSn 0wHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685021930; x=1687613930; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=0e4d294AXuwEBJZs4agoGK3jhgST3++yYamvsMPJTfc=; b=HMcvyfMrcE/aSD/Vv6wi26sVMFyGY+d6jRPnLfSBOF7ZcOecPZAhHOTebOpC8+8/zp yi7LSP7NpHpPdvEOfG1mpG8D0TChj05fXEPw0NbqiNZS30vfvB9FJH+fGxBrRovY0KBg /0Ezif+VGYS42PwDHVwATOai7tqwLEZb6enAlvTtQZ5EBn3ilW/cNzvj5dAiOpx2Y4lr 20zbEgXsnh1oGSGHYHkNwBej09ervFeQ1w5LU3TWI4NZzG24+eG5/UDqEnsXu93G1Wbu rvZY4CKmPKFqLjUfjNlY6sAlf3DkPPVdE8305BszX0YfPQJZ06kCo+dVX5XvKIaWbdBr NZkA== X-Gm-Message-State: AC+VfDy1vSbv6ojnMHuJUx/iLmu3jy4s3ExPkOywMinjI2mhicdJuZwt 4Ha2gXBVInvv0JwjGzt6YvU1BA== X-Google-Smtp-Source: ACHHUZ4O35f2uYOCtYMctE+1Yzb4uQOY0hA9HEUzlSdXlmKszPcNeQYC9QWL6M48LVxqYKuT78K5iQ== X-Received: by 2002:a5d:5710:0:b0:30a:bdfd:5c3c with SMTP id a16-20020a5d5710000000b0030abdfd5c3cmr1549534wrv.17.1685021930276; Thu, 25 May 2023 06:38:50 -0700 (PDT) Received: from localhost.localdomain ([5.133.47.210]) by smtp.gmail.com with ESMTPSA id z17-20020a5d6551000000b00301a351a8d6sm1803641wrv.84.2023.05.25.06.38.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 May 2023 06:38:49 -0700 (PDT) From: Srinivas Kandagatla To: vkoul@kernel.org Cc: andersson@kernel.org, yung-chuan.liao@linux.intel.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, Srinivas Kandagatla Subject: [PATCH v2 3/4] soundwire: qcom: add software workaround for bus clash interrupt assertion Date: Thu, 25 May 2023 14:38:11 +0100 Message-Id: <20230525133812.30841-4-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20230525133812.30841-1-srinivas.kandagatla@linaro.org> References: <20230525133812.30841-1-srinivas.kandagatla@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Sometimes Hard reset does not clear some of the registers, this sometimes results in firing a bus clash interrupt. Add workaround for this during power up sequence, as suggested by hardware manual. Signed-off-by: Srinivas Kandagatla --- drivers/soundwire/qcom.c | 56 ++++++++++++++++++++++++---------------- 1 file changed, 34 insertions(+), 22 deletions(-) diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index adf025194a31..1d2a105cb77f 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -793,6 +793,26 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void= *dev_id) return ret; } =20 +static bool swrm_wait_for_frame_gen_enabled(struct qcom_swrm_ctrl *ctrl) +{ + int retry =3D SWRM_LINK_STATUS_RETRY_CNT; + int comp_sts; + + do { + ctrl->reg_read(ctrl, SWRM_COMP_STATUS, &comp_sts); + + if (comp_sts & SWRM_FRM_GEN_ENABLED) + return true; + + usleep_range(500, 510); + } while (retry--); + + dev_err(ctrl->dev, "%s: link status not %s\n", __func__, + comp_sts & SWRM_FRM_GEN_ENABLED ? "connected" : "disconnected"); + + return false; +} + static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl) { u32 val; @@ -841,16 +861,28 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl) SWRM_RD_WR_CMD_RETRIES); } =20 + /* COMP Enable */ + ctrl->reg_write(ctrl, SWRM_COMP_CFG_ADDR, SWRM_COMP_CFG_ENABLE_MSK); + /* Set IRQ to PULSE */ ctrl->reg_write(ctrl, SWRM_COMP_CFG_ADDR, - SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK | - SWRM_COMP_CFG_ENABLE_MSK); + SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK); + + ctrl->reg_write(ctrl, ctrl->reg_layout[SWRM_REG_INTERRUPT_CLEAR], + 0xFFFFFFFF); =20 /* enable CPU IRQs */ if (ctrl->mmio) { ctrl->reg_write(ctrl, ctrl->reg_layout[SWRM_REG_INTERRUPT_CPU_EN], SWRM_INTERRUPT_STATUS_RMSK); } + + /* Set IRQ to PULSE */ + ctrl->reg_write(ctrl, SWRM_COMP_CFG_ADDR, + SWRM_COMP_CFG_IRQ_LEVEL_OR_PULSE_MSK | + SWRM_COMP_CFG_ENABLE_MSK); + + swrm_wait_for_frame_gen_enabled(ctrl); ctrl->slave_status =3D 0; ctrl->reg_read(ctrl, SWRM_COMP_PARAMS, &val); ctrl->rd_fifo_depth =3D FIELD_GET(SWRM_COMP_PARAMS_RD_FIFO_DEPTH, val); @@ -1626,26 +1658,6 @@ static int qcom_swrm_remove(struct platform_device *= pdev) return 0; } =20 -static bool swrm_wait_for_frame_gen_enabled(struct qcom_swrm_ctrl *ctrl) -{ - int retry =3D SWRM_LINK_STATUS_RETRY_CNT; - int comp_sts; - - do { - ctrl->reg_read(ctrl, SWRM_COMP_STATUS, &comp_sts); - - if (comp_sts & SWRM_FRM_GEN_ENABLED) - return true; - - usleep_range(500, 510); - } while (retry--); - - dev_err(ctrl->dev, "%s: link status not %s\n", __func__, - comp_sts & SWRM_FRM_GEN_ENABLED ? "connected" : "disconnected"); - - return false; -} - static int __maybe_unused swrm_runtime_resume(struct device *dev) { struct qcom_swrm_ctrl *ctrl =3D dev_get_drvdata(dev); --=20 2.21.0