From patchwork Fri Mar 10 04:08:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13168722 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 308FEC64EC4 for ; Fri, 10 Mar 2023 04:12:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231183AbjCJEMk (ORCPT ); Thu, 9 Mar 2023 23:12:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230287AbjCJELT (ORCPT ); Thu, 9 Mar 2023 23:11:19 -0500 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B3CFF31C9 for ; Thu, 9 Mar 2023 20:10:00 -0800 (PST) Received: by mail-pl1-x636.google.com with SMTP id y11so4337211plg.1 for ; Thu, 09 Mar 2023 20:10:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678421392; 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=Cfp/acTiWdK8wUm8C9dXVBGQPGUivfzPYcratFFfeXU=; b=IS3acGy5v+D1VrXLpVM4lVMitkBA6ZuCnc6t6WwzHNiDo99e6PL6fuhKYY/+Yq/yMZ LdZat7BftgHuO2RraexQ1g77BV+Iz7iCa5UrrspEL6OT7wykulaC0h6Yd4h/JTBCz30J FCSJMwZARxsKLBmXk5AzY9vcsd7hnx9Q47KT+pLYE0FOJEArcER7cOWmMZP6K9zgbs15 KJSMQv5e+JhI+WA4xdf1Yfxy1dDLvzbSMhivgV8JqxUd86wnhq6JfNkZ/XnrI77uK0+W 0kQ1oFhSV33XY1D0/YTfp42tBnyEsgYoxF6R8pAELjDFhsnAHB9hv9R6Vh6vSROBErEE 62KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678421392; 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=Cfp/acTiWdK8wUm8C9dXVBGQPGUivfzPYcratFFfeXU=; b=5HedaeMEtwxqCaW1RlK83kT/UbJxCRla1v/mPOyiw2SNUvyzq8nWVvsHiqKLvRlh9R I67WmWbhk/lBuQdYLk8Z6wMcSAXSNDpSIQVaqBmPxuKWx2IHeupIN/HGNEws5aMJY6s1 O2OlPrIqfCNE6Co/fOD8dFGPj25rS4W8sJek61GrcRK8UL+vuh5kRt87CVDlTQBaSRqJ RfLNszfu3656VMCLQzq81pN+YAqv+38qo/wMAFETOVt7EyhrW5tC8kPibReHwPzMHSP+ 7++fl00uk2cpMcgB7E1+UfssOy2/dEaOh+IBxt4RGcgIegieUY+J9f3V0iLepJpbfZFw zTkA== X-Gm-Message-State: AO0yUKUX526gIXceJxm6fDEcFjd7lAfx5MlxjaWB8zEjjMc3cZTBQ4VJ 0/k7ZKUr9ZzliemaffbVH6tz X-Google-Smtp-Source: AK7set+IKlMWqaM2XNdJYO2si2eZpmwBP99pU4gDIsIruNSA7QDd6FFNQO9ZrRMxs4CL8ydTBTeo1w== X-Received: by 2002:a05:6a20:548a:b0:cc:d891:b2b1 with SMTP id i10-20020a056a20548a00b000ccd891b2b1mr31419746pzk.35.1678421392094; Thu, 09 Mar 2023 20:09:52 -0800 (PST) Received: from localhost.localdomain ([27.111.75.67]) by smtp.gmail.com with ESMTPSA id y26-20020aa7855a000000b0058d92d6e4ddsm361846pfn.5.2023.03.09.20.09.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Mar 2023 20:09:51 -0800 (PST) From: Manivannan Sadhasivam To: andersson@kernel.org, lpieralisi@kernel.org, kw@linux.com, krzysztof.kozlowski+dt@linaro.org, robh@kernel.org Cc: konrad.dybcio@linaro.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, quic_srichara@quicinc.com, Manivannan Sadhasivam Subject: [PATCH v3 19/19] PCI: qcom: Expose link transition counts via debugfs for v2.4.0 Date: Fri, 10 Mar 2023 09:38:16 +0530 Message-Id: <20230310040816.22094-20-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230310040816.22094-1-manivannan.sadhasivam@linaro.org> References: <20230310040816.22094-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Qualcomm PCIe controllers of version v2.4.0 have debug registers in the PARF region that count PCIe link transitions. Expose them over debugfs to userspace to help debug the low power issues. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom.c | 33 ++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index f99b7e7f3f73..0b41f007fa90 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -37,6 +37,7 @@ /* PARF registers */ #define PARF_SYS_CTRL 0x00 #define PARF_PM_CTRL 0x20 +#define PARF_PM_STTS 0x24 #define PARF_PCS_DEEMPH 0x34 #define PARF_PCS_SWING 0x38 #define PARF_PHY_CTRL 0x40 @@ -84,6 +85,12 @@ /* PARF_PM_CTRL register fields */ #define REQ_NOT_ENTR_L1 BIT(5) +/* PARF_PM_STTS register fields */ +#define PM_LINKST_IN_L1SUB BIT(8) +#define PM_LINKST_IN_L0S BIT(7) +#define PM_LINKST_IN_L2 BIT(5) +#define PM_LINKST_IN_L1 BIT(4) + /* PARF_PCS_DEEMPH register fields */ #define PCS_DEEMPH_TX_DEEMPH_GEN1(x) FIELD_PREP(GENMASK(21, 16), x) #define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) FIELD_PREP(GENMASK(13, 8), x) @@ -737,6 +744,31 @@ static int qcom_pcie_post_init_2_4_0(struct qcom_pcie *pcie) return 0; } +static int qcom_pcie_debugfs_func_2_4_0(struct seq_file *s, void *data) +{ + struct qcom_pcie *pcie = (struct qcom_pcie *) dev_get_drvdata(s->private); + + seq_printf(s, "L0s transition count: %u\n", + readl_relaxed(pcie->parf + PM_LINKST_IN_L0S)); + + seq_printf(s, "L1 transition count: %u\n", + readl_relaxed(pcie->parf + PM_LINKST_IN_L1)); + + seq_printf(s, "L1.1 transition count: %u\n", + readl_relaxed(pcie->parf + PM_LINKST_IN_L1SUB)); + + seq_printf(s, "L2 transition count: %u\n", + readl_relaxed(pcie->parf + PM_LINKST_IN_L2)); + + return 0; +} + + +static void qcom_pcie_init_debugfs_2_4_0(struct qcom_pcie *pcie) +{ + qcom_pcie_init_debugfs(pcie, qcom_pcie_debugfs_func_2_4_0); +} + static int qcom_pcie_get_resources_2_3_3(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_3_3 *res = &pcie->res.v2_3_3; @@ -1300,6 +1332,7 @@ static const struct qcom_pcie_ops ops_2_4_0 = { .post_init = qcom_pcie_post_init_2_4_0, .deinit = qcom_pcie_deinit_2_4_0, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, + .init_debugfs = qcom_pcie_init_debugfs_2_4_0, }; /* Qcom IP rev.: 2.3.3 Synopsys IP rev.: 4.30a */