From patchwork Tue Oct 3 11:12:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 729623 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 2680EE7544C for ; Tue, 3 Oct 2023 11:13:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232111AbjJCLNr (ORCPT ); Tue, 3 Oct 2023 07:13:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50188 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240013AbjJCLNl (ORCPT ); Tue, 3 Oct 2023 07:13:41 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A423102 for ; Tue, 3 Oct 2023 04:13:27 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id d9443c01a7336-1c5c91bec75so5712635ad.3 for ; Tue, 03 Oct 2023 04:13:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1696331606; x=1696936406; 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=ccxuqm7BPe/obJGZ0JRYI3uaIFICPznjHF4970iXFxs=; b=rjHxX5pzanswGzD9FqPs9PwX71D4fat9NfVDQtX1mnTCG7r1u9ysvzcbhLvdFr6bwt dglDihBCMxqZ6RD/lVQIZ74rw44AMlS5F+D+4nSIGM1WEDox4/eC/9zB5/auZ25Blwrp 5wHusiRdei4y08j2MNmQERpUTw/e4zhJ5hF5V9MOhiQYvub7fDJUzvXLyOCGHXcqJVbb YRMgBn0/GaroLtmzVq18zAo7dJsO5Ck41SYrUlcqVqJ8s5Ryh0FDa9sGgf5CpqMmB57z si0xyfNDW9owaCFL2tq0g1EBLKsAjwInu1GVZ1r/JcX3KVJ2Vr68E6fKEsrGYaizKpop u8fA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696331606; x=1696936406; 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=ccxuqm7BPe/obJGZ0JRYI3uaIFICPznjHF4970iXFxs=; b=gAV6sarZkemKG5Te72Z/I9cJ3KFlKVNXWPLI/l7rDZevemYZQAawoWrETlLbN+plYZ ypci0/UjcR4WvmzAhXTOpaV9wTBNndySWaV3BE36mvuA8KdArs+sMTa4q52bJn35gGNq m9nWl8Q/ibyvNXKMEQxr4i+KUL368ek9gTDuLDRY5XBfmDFLn8BTUEy4ISOk6b3E3S9G UvWii3oEmmGJL96xHRy3fVniU+HbgO0IQdunOmtyvF8aFYm2nnQVPfOk9MEYQDuDFRri pO5eQ4BwMo/teUrhB5YjqWq9Vj7bv2EK5AaITcTR7bsd+eliwu+uwvLh/uHFLbdBR5OA F1sA== X-Gm-Message-State: AOJu0Ywf76D8BonG7qi/mFJM3fbVX9Ipiv94uoGbJXDOVeR02hM0NE+W GQWbGhaWZbJiDWeBPkUVzygy X-Google-Smtp-Source: AGHT+IG+EzxCaDyR1hmq+xxzCf4MwduhgWuu2h5N8KbdnQI4+ntIITzPo/krTZQqHOvEucRTU9nnBQ== X-Received: by 2002:a17:903:120b:b0:1c6:1861:70c with SMTP id l11-20020a170903120b00b001c61861070cmr13871970plh.20.1696331605751; Tue, 03 Oct 2023 04:13:25 -0700 (PDT) Received: from localhost.localdomain ([117.217.185.220]) by smtp.gmail.com with ESMTPSA id d9-20020a170903230900b001ab2b4105ddsm1250328plh.60.2023.10.03.04.13.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Oct 2023 04:13:25 -0700 (PDT) From: Manivannan Sadhasivam To: vireshk@kernel.org, nm@ti.com, sboyd@kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, andersson@kernel.org, konrad.dybcio@linaro.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com Cc: alim.akhtar@samsung.com, avri.altman@wdc.com, bvanassche@acm.org, linux-scsi@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, quic_asutoshd@quicinc.com, quic_cang@quicinc.com, quic_nitirawa@quicinc.com, quic_narepall@quicinc.com, quic_bhaskarv@quicinc.com, quic_richardp@quicinc.com, quic_nguyenb@quicinc.com, quic_ziqichen@quicinc.com, bmasney@redhat.com, krzysztof.kozlowski@linaro.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH v4 4/6] scsi: ufs: host: Add support for parsing OPP Date: Tue, 3 Oct 2023 16:42:30 +0530 Message-Id: <20231003111232.42663-5-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231003111232.42663-1-manivannan.sadhasivam@linaro.org> References: <20231003111232.42663-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org OPP framework can be used to scale the clocks along with other entities such as regulators, performance state etc... So let's add support for parsing OPP from devicetree. OPP support in devicetree is added through the "operating-points-v2" property which accepts the OPP table defining clock frequency, regulator voltage, power domain performance state etc... Since the UFS controller requires multiple clocks to be controlled for proper working, devm_pm_opp_set_config() has been used which supports scaling multiple clocks through custom ufshcd_opp_config_clks() callback. It should be noted that the OPP support is not compatible with the old "freq-table-hz" property. So only one can be used at a time even though the UFS core supports both. Co-developed-by: Krzysztof Kozlowski Signed-off-by: Krzysztof Kozlowski Signed-off-by: Manivannan Sadhasivam --- drivers/ufs/core/ufshcd.c | 35 ++++++++++++++ drivers/ufs/host/ufshcd-pltfrm.c | 78 ++++++++++++++++++++++++++++++++ include/ufs/ufshcd.h | 3 ++ 3 files changed, 116 insertions(+) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 55de0ff1f01f..ccd7fcd18355 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -1064,6 +1064,41 @@ static int ufshcd_set_clk_freq(struct ufs_hba *hba, bool scale_up) return ret; } +int ufshcd_opp_config_clks(struct device *dev, struct opp_table *opp_table, + struct dev_pm_opp *opp, void *data, + bool scaling_down) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + struct list_head *head = &hba->clk_list_head; + struct ufs_clk_info *clki; + unsigned long freq; + u8 idx = 0; + int ret; + + list_for_each_entry(clki, head, list) { + if (!IS_ERR_OR_NULL(clki->clk)) { + freq = dev_pm_opp_get_freq_indexed(opp, idx++); + + /* Do not set rate for clocks having frequency as 0 */ + if (!freq) + continue; + + ret = clk_set_rate(clki->clk, freq); + if (ret) { + dev_err(dev, "%s: %s clk set rate(%ldHz) failed, %d\n", + __func__, clki->name, freq, ret); + return ret; + } + + trace_ufshcd_clk_scaling(dev_name(dev), + (scaling_down ? "scaled down" : "scaled up"), + clki->name, hba->clk_scaling.target_freq, freq); + } + } + + return 0; +} + static int ufshcd_opp_set_rate(struct ufs_hba *hba, unsigned long freq) { struct dev_pm_opp *opp; diff --git a/drivers/ufs/host/ufshcd-pltfrm.c b/drivers/ufs/host/ufshcd-pltfrm.c index 797a4dfe45d9..ffd786991244 100644 --- a/drivers/ufs/host/ufshcd-pltfrm.c +++ b/drivers/ufs/host/ufshcd-pltfrm.c @@ -10,6 +10,7 @@ #include #include +#include #include #include @@ -207,6 +208,77 @@ static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba) } } +static int ufshcd_parse_operating_points(struct ufs_hba *hba) +{ + struct device *dev = hba->dev; + struct device_node *np = dev->of_node; + struct dev_pm_opp_config config = {}; + struct ufs_clk_info *clki; + const char **clk_names; + int cnt, i, ret; + + if (!of_find_property(np, "operating-points-v2", NULL)) + return 0; + + if (of_find_property(np, "freq-table-hz", NULL)) { + dev_err(dev, "%s: operating-points and freq-table-hz are incompatible\n", + __func__); + return -EINVAL; + } + + cnt = of_property_count_strings(np, "clock-names"); + if (cnt <= 0) { + dev_err(dev, "%s: Missing clock-names\n", __func__); + return -ENODEV; + } + + /* OPP expects clk_names to be NULL terminated */ + clk_names = devm_kcalloc(dev, cnt + 1, sizeof(*clk_names), GFP_KERNEL); + if (!clk_names) + return -ENOMEM; + + /* + * We still need to get reference to all clocks as the UFS core uses + * them separately. + */ + for (i = 0; i < cnt; i++) { + ret = of_property_read_string_index(np, "clock-names", i, + &clk_names[i]); + if (ret) + return ret; + + clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL); + if (!clki) + return -ENOMEM; + + clki->name = devm_kstrdup(dev, clk_names[i], GFP_KERNEL); + if (!clki->name) + return -ENOMEM; + + if (!strcmp(clk_names[i], "ref_clk")) + clki->keep_link_active = true; + + list_add_tail(&clki->list, &hba->clk_list_head); + } + + config.clk_names = clk_names, + config.config_clks = ufshcd_opp_config_clks; + + ret = devm_pm_opp_set_config(dev, &config); + if (ret) + return ret; + + ret = devm_pm_opp_of_add_table(dev); + if (ret) { + dev_err(dev, "Failed to add OPP table: %d\n", ret); + return ret; + } + + hba->use_pm_opp = true; + + return 0; +} + /** * ufshcd_get_pwr_dev_param - get finally agreed attributes for * power mode change @@ -373,6 +445,12 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, ufshcd_init_lanes_per_dir(hba); + err = ufshcd_parse_operating_points(hba); + if (err) { + dev_err(dev, "%s: OPP parse failed %d\n", __func__, err); + goto dealloc_host; + } + err = ufshcd_init(hba, mmio_base, irq); if (err) { dev_err_probe(dev, err, "Initialization failed with error %d\n", diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index c181cc5c523b..8491b690e3ef 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -1257,6 +1257,9 @@ void ufshcd_mcq_make_queues_operational(struct ufs_hba *hba); void ufshcd_mcq_enable_esi(struct ufs_hba *hba); void ufshcd_mcq_config_esi(struct ufs_hba *hba, struct msi_msg *msg); +int ufshcd_opp_config_clks(struct device *dev, struct opp_table *opp_table, + struct dev_pm_opp *opp, void *data, + bool scaling_down); /** * ufshcd_set_variant - set variant specific data to the hba * @hba: per adapter instance