From patchwork Mon Oct 31 18:02:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13026252 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 DACBDFA3741 for ; Mon, 31 Oct 2022 18:05:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230147AbiJaSFk (ORCPT ); Mon, 31 Oct 2022 14:05:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230149AbiJaSEU (ORCPT ); Mon, 31 Oct 2022 14:04:20 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2128A13E16 for ; Mon, 31 Oct 2022 11:04:19 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id b185so11337357pfb.9 for ; Mon, 31 Oct 2022 11:04:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; 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=vcGYZZ4IatcAF8AJIOp/3hmvo2iIimpjADZP7Jg0G+Q=; b=D5dBZnhZe6DUySFjnbf93OShH5vvNpcUk7dbkYFI/9SGqfaCTZ4Rkp0Edx97sxFA3Y 7GxwwYlKf6BZM4cIl+dt6cWLFoO0wMlDcFiyoGvS/d9cxPXWKzAOz0L7yR6Frthwg0bN wMWfjIJGhjUDQ2OzbwDOJLkfapGJ/ih+rKfkBPmfJFZydZ15IvL0hAkCGoQirYD6qy3+ tO/FE+pLZWAT7X8YILnePQBDJgdhMK6Ihpk94/j0HWDdYfjUiL+4f66bTV8Vy/VpzMEG GQqHD2RZ6fNBgcK6YWlx4bpU9Tw0ZDRA2Qp9abSe7gPTaPXRBFeq0aqoIm9NtU60lvq6 AG/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=vcGYZZ4IatcAF8AJIOp/3hmvo2iIimpjADZP7Jg0G+Q=; b=fJc4kAZGxxsAe3OAWS5tAcNJ0m0+HHnY67Ty/LLg3/fIIw5F48hHT6cwym8BivWCnb 38WhVeJKTSNr+jDbVx6YisumUOms8apbq43bxYYTepGcAsYp17xHUUd25mEKpEvUZvGN NYbQsX/81INzXFRt8LGz1VXR2GAkdg1/0GOh3nU6HlhrNsgjNHdqwhT7yWyGVXoitMkj PlRpYCHOrGXpl5zH0Ul4qBSvDc6RBVOKK188pibq8n5XYNb3klycDhoVS+PMUeH6ZaZA aCPRY9HDCjVgPb3JK5JkoYj65zrmDaiYPSGPxslPHE0ZEUp7ya4HWyhDzWC5f5f99Dnw gq6Q== X-Gm-Message-State: ACrzQf0sHVxoln88vfyqNmPYn/G1jGFacyJhnnzq9oELyijFNBYwdkbv IfawIdjz1+MVSYARYvSDSwaD X-Google-Smtp-Source: AMsMyM4aDq/tMQ3zInAZrDzw487GBW7QgdEEgKfyMP/pEU+B81Elhn+1+cuPdk/FuuEaW4m7y1VNYA== X-Received: by 2002:a05:6a02:207:b0:46f:1a92:9474 with SMTP id bh7-20020a056a02020700b0046f1a929474mr13142706pgb.344.1667239458584; Mon, 31 Oct 2022 11:04:18 -0700 (PDT) Received: from localhost.localdomain ([117.193.209.221]) by smtp.gmail.com with ESMTPSA id q14-20020a170902a3ce00b00186c6d2e7e3sm4742224plb.26.2022.10.31.11.04.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Oct 2022 11:04:17 -0700 (PDT) From: Manivannan Sadhasivam To: martin.petersen@oracle.com, jejb@linux.ibm.com, andersson@kernel.org, vkoul@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: konrad.dybcio@somainline.org, robh+dt@kernel.org, quic_cang@quicinc.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-scsi@vger.kernel.org, dmitry.baryshkov@linaro.org, ahalaney@redhat.com, Manivannan Sadhasivam Subject: [PATCH v2 14/15] scsi: ufs: ufs-qcom: Add support for finding HS gear on new UFS versions Date: Mon, 31 Oct 2022 23:32:16 +0530 Message-Id: <20221031180217.32512-15-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221031180217.32512-1-manivannan.sadhasivam@linaro.org> References: <20221031180217.32512-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Starting from UFS controller v4, Qcom supports dual gear mode (i.e., the controller/PHY can be configured to run in two gear speeds). But that requires an agreement between the UFS controller and the UFS device. This commit finds the max gear supported by both controller and device then decides which one to use. UFS controller's max gear can be read from the REG_UFS_PARAM0 register and UFS device's max gear can be read from the "max-device-gear" devicetree property. The UFS PHY also needs to be configured with the decided gear using the phy_set_mode_ext() API. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Andrew Halaney --- drivers/ufs/host/ufs-qcom.c | 31 ++++++++++++++++++++++++++++--- drivers/ufs/host/ufs-qcom.h | 4 ++++ 2 files changed, 32 insertions(+), 3 deletions(-) diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c index c93d2d38b43e..ca60a5b0292b 100644 --- a/drivers/ufs/host/ufs-qcom.c +++ b/drivers/ufs/host/ufs-qcom.c @@ -281,6 +281,9 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba) static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba, u32 hs_gear) { struct ufs_qcom_host *host = ufshcd_get_variant(hba); + struct device *dev = hba->dev; + u32 max_device_gear, max_hcd_gear, reg; + int ret; if (host->hw_ver.major == 0x1) { /* @@ -292,8 +295,29 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba, u32 hs_gear) */ if (hs_gear > UFS_HS_G2) return UFS_HS_G2; + } else if (host->hw_ver.major > 0x3) { + /* + * Starting from UFS controller v4, Qcom supports dual gear mode (i.e., the + * controller/PHY can be configured to run in two gear speeds). But that + * requires an agreement between the UFS controller and the device. Below + * code tries to find the max gear of both and decides which gear to use. + * + * First get the max gear supported by the UFS device if available. + * If the property is not defined in devicetree, then use the default gear. + */ + ret = of_property_read_u32(dev->of_node, "max-device-gear", &max_device_gear); + if (ret) + goto err_out; + + /* Next get the max gear supported by the UFS controller */ + reg = ufshcd_readl(hba, REG_UFS_PARAM0); + max_hcd_gear = UFS_QCOM_MAX_GEAR(reg); + + /* Now return the minimum of both gears */ + return min(max_device_gear, max_hcd_gear); } +err_out: /* Default is HS-G3 */ return UFS_HS_G3; } @@ -303,7 +327,7 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba) struct ufs_qcom_host *host = ufshcd_get_variant(hba); struct phy *phy = host->generic_phy; int ret; - bool is_rate_B = UFS_QCOM_LIMIT_HS_RATE == PA_HS_MODE_B; + u32 hs_gear; /* Reset UFS Host Controller and PHY */ ret = ufs_qcom_host_reset(hba); @@ -311,8 +335,9 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba) dev_warn(hba->dev, "%s: host reset returned %d\n", __func__, ret); - if (is_rate_B) - phy_set_mode(phy, PHY_MODE_UFS_HS_B); + /* UFS_HS_G2 is used here since that's the least gear supported by legacy Qcom platforms */ + hs_gear = ufs_qcom_get_hs_gear(hba, UFS_HS_G2); + phy_set_mode_ext(phy, PHY_MODE_UFS_HS_B, hs_gear); /* phy initialization - calibrate the phy */ ret = phy_init(phy); diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h index 7fe928b82753..751ded3e3531 100644 --- a/drivers/ufs/host/ufs-qcom.h +++ b/drivers/ufs/host/ufs-qcom.h @@ -94,6 +94,10 @@ enum { #define TMRLUT_HW_CGC_EN BIT(6) #define OCSC_HW_CGC_EN BIT(7) +/* bit definitions for REG_UFS_PARAM0 */ +#define MAX_HS_GEAR_MASK GENMASK(6, 4) +#define UFS_QCOM_MAX_GEAR(x) FIELD_GET(MAX_HS_GEAR_MASK, (x)) + /* bit definition for UFS_UFS_TEST_BUS_CTRL_n */ #define TEST_BUS_SUB_SEL_MASK GENMASK(4, 0) /* All XXX_SEL fields are 5 bits wide */