From patchwork Tue Oct 10 15:59:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13415742 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 20723CD8CA5 for ; Tue, 10 Oct 2023 15:59:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233608AbjJJP7k (ORCPT ); Tue, 10 Oct 2023 11:59:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233673AbjJJP7i (ORCPT ); Tue, 10 Oct 2023 11:59:38 -0400 Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6CB597 for ; Tue, 10 Oct 2023 08:59:34 -0700 (PDT) Received: by mail-il1-x135.google.com with SMTP id e9e14a558f8ab-351574aca7bso19660055ab.3 for ; Tue, 10 Oct 2023 08:59:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1696953574; x=1697558374; darn=vger.kernel.org; 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=3XHRCY63hQtzpYUIBv5+mXIDtPmwcujXauM/JNVB8nw=; b=SDf7MCmQAEga71pshauObsxutTVz/eEpcgeWbSTX4ZcfhwDPBsfKPGDQYgjFXkDfhX A6mjI6wRkp1LfpNm2GTezfYQ7F967XhMFaK+8fCUN6rStRmb3QgtMjqBpp7RaqMeOMHy qY5sw2cfcHX+kLGtCU0SSw6kP+CD9GVwub+cMkoU5tGd2+4gRaI0KcetpEgTzh05RcH5 7y39wsrrbEUr3WLU6fZ0wAu0psYY0hKw6xw1quZPVQeQlE7G+uD0nrLj/J6YvXEZM73W BkGpqw6haT22QcjsKOh0exh0caENmVwW3UGHHEUdbo3rFK+teUEKX95nzZAU3QGM1jDo lnvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696953574; x=1697558374; 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=3XHRCY63hQtzpYUIBv5+mXIDtPmwcujXauM/JNVB8nw=; b=R3wZP7+SDMUsqytU3ZyS0OASAFwvpFy82i+HtBYMpKcvG0UW8zKAxs4Oux+8EmouQj ZLX4yMh0XqWdsQYa6y/iYvyjMKjfY1kfHZbRGVuk/jbhXzipYduzF2ynSdUaqzDouyaN BwPQ+q0vXTXi5m0qXmDf3sy+B9Q3KY1dn5EXo1MDJI75CoMQTRMLoujndKAOfGgVRZwI FYSTEMevefzORYrgSUnZg6dcK6lvxtMxnWcpXidd3KWuI+CVEhFyR5Jp2AOBuBSb9a4A DLtkneqXk/sSjT3/uMvLCSlC3mrQSxmrjSIFS/TIk1snxQeIAwyUzYawibzhD8+bHrEh 2Pog== X-Gm-Message-State: AOJu0Yx9/70z83yqwVxJkjaF06aPyhBrhhsLNkUCS0uLHrtCTT8gqhPY E3wlwID92fhZdro8epKKjnlH X-Google-Smtp-Source: AGHT+IGk6lhfteareySKoKmtG0TR3ZpRvS2BBgEg1dkurU1opNq04IT4XZ1Vl0Lw4Y6MvCuF22L94A== X-Received: by 2002:a05:6e02:ecc:b0:34f:c9b4:5f9c with SMTP id i12-20020a056e020ecc00b0034fc9b45f9cmr16813737ilk.31.1696953574071; Tue, 10 Oct 2023 08:59:34 -0700 (PDT) Received: from localhost.localdomain ([117.217.182.234]) by smtp.gmail.com with ESMTPSA id c24-20020a637258000000b0055c178a8df1sm6537023pgn.94.2023.10.10.08.59.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Oct 2023 08:59:33 -0700 (PDT) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com, bhelgaas@google.com Cc: robh@kernel.org, gustavo.pimentel@synopsys.com, jingoohan1@gmail.com, andersson@kernel.org, konrad.dybcio@linaro.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH v2 1/2] PCI: dwc: Add host_post_init() callback Date: Tue, 10 Oct 2023 21:29:13 +0530 Message-Id: <20231010155914.9516-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231010155914.9516-1-manivannan.sadhasivam@linaro.org> References: <20231010155914.9516-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This callback can be used by the platform drivers to do configuration once all the devices are scanned. Like changing LNKCTL of all downstream devices to enable ASPM etc... Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-designware-host.c | 3 +++ drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index a7170fd0e847..7991f0e179b2 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -502,6 +502,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) if (ret) goto err_stop_link; + if (pp->ops->host_post_init) + pp->ops->host_post_init(pp); + return 0; err_stop_link: diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index ef0b2efa9f93..efb4d4754fc8 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -301,6 +301,7 @@ enum dw_pcie_ltssm { struct dw_pcie_host_ops { int (*host_init)(struct dw_pcie_rp *pp); void (*host_deinit)(struct dw_pcie_rp *pp); + void (*host_post_init)(struct dw_pcie_rp *pp); int (*msi_host_init)(struct dw_pcie_rp *pp); void (*pme_turn_off)(struct dw_pcie_rp *pp); }; From patchwork Tue Oct 10 15:59:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13415743 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 AF834CD8CA6 for ; Tue, 10 Oct 2023 15:59:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233677AbjJJP7l (ORCPT ); Tue, 10 Oct 2023 11:59:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233681AbjJJP7k (ORCPT ); Tue, 10 Oct 2023 11:59:40 -0400 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DAE8CA for ; 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But for enabling ASPM by default (without Kconfig/cmdline/sysfs), BIOS has to enable ASPM on both host bridge and downstream devices during boot. Unfortunately, none of the BIOS available on Qcom platforms enables ASPM. Due to this, the platforms making use of Qcom SoCs draw high power during runtime. To fix this power issue, users/distros have to enable ASPM using configs such as (Kconfig/cmdline/sysfs) or the BIOS has to start enabling ASPM. The latter may happen in the future, but that won't address the issue on current platforms. Also, asking users/distros to enable a feature to get the power management right would provide an unpleasant out-of-the-box experience. So the apt solution is to enable ASPM in the controller driver itself. And this is being accomplished by calling pci_enable_link_state() in the newly introduced host_post_init() callback for all the devices connected to the bus. This function enables all supported link low power states for both host bridge and the downstream devices. Due to limited testing, ASPM is only enabled for platforms making use of ops_1_9_0 callbacks. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom.c | 28 ++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 367acb419a2b..c324c3daaa5a 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -222,6 +222,7 @@ struct qcom_pcie_ops { int (*get_resources)(struct qcom_pcie *pcie); int (*init)(struct qcom_pcie *pcie); int (*post_init)(struct qcom_pcie *pcie); + void (*host_post_init)(struct qcom_pcie *pcie); void (*deinit)(struct qcom_pcie *pcie); void (*ltssm_enable)(struct qcom_pcie *pcie); int (*config_sid)(struct qcom_pcie *pcie); @@ -967,6 +968,22 @@ static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie) return 0; } +static int qcom_pcie_enable_aspm(struct pci_dev *pdev, void *userdata) +{ + /* Downstream devices need to be in D0 state before enabling PCI PM substates */ + pci_set_power_state(pdev, PCI_D0); + pci_enable_link_state(pdev, PCIE_LINK_STATE_ALL); + + return 0; +} + +static void qcom_pcie_host_post_init_2_7_0(struct qcom_pcie *pcie) +{ + struct dw_pcie_rp *pp = &pcie->pci->pp; + + pci_walk_bus(pp->bridge->bus, qcom_pcie_enable_aspm, NULL); +} + static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie) { struct qcom_pcie_resources_2_7_0 *res = &pcie->res.v2_7_0; @@ -1219,9 +1236,19 @@ static void qcom_pcie_host_deinit(struct dw_pcie_rp *pp) pcie->cfg->ops->deinit(pcie); } +static void qcom_pcie_host_post_init(struct dw_pcie_rp *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct qcom_pcie *pcie = to_qcom_pcie(pci); + + if (pcie->cfg->ops->host_post_init) + pcie->cfg->ops->host_post_init(pcie); +} + static const struct dw_pcie_host_ops qcom_pcie_dw_ops = { .host_init = qcom_pcie_host_init, .host_deinit = qcom_pcie_host_deinit, + .host_post_init = qcom_pcie_host_post_init, }; /* Qcom IP rev.: 2.1.0 Synopsys IP rev.: 4.01a */ @@ -1283,6 +1310,7 @@ static const struct qcom_pcie_ops ops_1_9_0 = { .get_resources = qcom_pcie_get_resources_2_7_0, .init = qcom_pcie_init_2_7_0, .post_init = qcom_pcie_post_init_2_7_0, + .host_post_init = qcom_pcie_host_post_init_2_7_0, .deinit = qcom_pcie_deinit_2_7_0, .ltssm_enable = qcom_pcie_2_3_2_ltssm_enable, .config_sid = qcom_pcie_config_sid_1_9_0,