From patchwork Wed Mar 20 09:49:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rajendra Nayak X-Patchwork-Id: 10861139 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 335DD1708 for ; Wed, 20 Mar 2019 09:50:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20EE9289DD for ; Wed, 20 Mar 2019 09:50:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 153D2299CE; Wed, 20 Mar 2019 09:50:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A89E529945 for ; Wed, 20 Mar 2019 09:50:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727732AbfCTJuC (ORCPT ); Wed, 20 Mar 2019 05:50:02 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:50938 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727694AbfCTJuB (ORCPT ); Wed, 20 Mar 2019 05:50:01 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id E1DC361231; Wed, 20 Mar 2019 09:50:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1553075400; bh=xLWp2CA62FmdAwyYbFoeoX+SuUcf//mCdkLIsuQ6ygY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CCuKjSrwUfnkFluHZKV6LFRQOu48tD/Qijxdv/mFLtEHr1lu8GZrpzMYPggS5jt07 eVzR0fIkLi+UySaodL05M60/j/OoHjCA52WrchIapjDH+Hbo7oD340Dia2MCaoyVrK NsmGsLtnp5e2BPHbOzAExz/RP6NvKcQB/xpgLWOg= Received: from blr-ubuntu-173.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: rnayak@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id C6511611BE; Wed, 20 Mar 2019 09:49:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1553075399; bh=xLWp2CA62FmdAwyYbFoeoX+SuUcf//mCdkLIsuQ6ygY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Na9n01Ied7Ip0EVp98ZckL0Hy43nQJ6lo/UvC1uSVAmWg+jdtE69C53+FEP/QAzGK NnfESvLHC1nVF6gs2BOnbXL7m2YRGAOaJdN8W8y+O7nB0Cr1KNUpbRTIVLHrHKnytE B/EVV4yJsbkl1c8rgo+bvhVunKEnbOGZjnqbiu7o= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C6511611BE Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=rnayak@codeaurora.org From: Rajendra Nayak To: linux-kernel@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, linux-serial@vger.kernel.org, linux-spi@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-scsi@vger.kernel.org, swboyd@chromium.org, ulf.hansson@linaro.org, viresh.kumar@linaro.org, dianders@chromium.org, rafael@kernel.org, Rajendra Nayak Subject: [RFC v2 06/11] scsi: ufs: Add support to manage multiple power domains in ufshcd-pltfrm Date: Wed, 20 Mar 2019 15:19:13 +0530 Message-Id: <20190320094918.20234-7-rnayak@codeaurora.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190320094918.20234-1-rnayak@codeaurora.org> References: <20190320094918.20234-1-rnayak@codeaurora.org> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some UFS devices need to manage multiple powerdomains. Add support for it as part of the ufshcd-pltfrm driver. Signed-off-by: Rajendra Nayak --- drivers/scsi/ufs/ufshcd-pltfrm.c | 52 +++++++++++++++++++++++++++++++- drivers/scsi/ufs/ufshcd.h | 3 ++ 2 files changed, 54 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c index 238a79f21e74..ce33eb8b7510 100644 --- a/drivers/scsi/ufs/ufshcd-pltfrm.c +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c @@ -34,6 +34,7 @@ */ #include +#include #include #include @@ -289,6 +290,43 @@ static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba) } } +static int ufshcd_attach_pds(struct device *dev, struct ufs_hba *hba, int num_pds) +{ + int i, ret; + + hba->virt_devs = devm_kzalloc(dev, sizeof(struct device *) * num_pds, + GFP_KERNEL); + if (!hba->virt_devs) + return -ENOMEM; + + hba->num_virt_devs = num_pds; + for (i = 0; i < num_pds; i++) { + hba->virt_devs[i] = dev_pm_domain_attach_by_id(dev, i); + if (IS_ERR(hba->virt_devs[i])) { + ret = PTR_ERR(hba->virt_devs[i]); + goto unroll_attach; + } + device_link_add(dev,hba->virt_devs[i], DL_FLAG_RPM_ACTIVE | + DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS); + } + + return ret; + +unroll_attach: + for (i--; i >= 0; i--) + dev_pm_domain_detach(hba->virt_devs[i], false); + + return ret; +} + +static void ufshcd_detach_pds(struct ufs_hba *hba) +{ + int i; + + for (i = 0; i < hba->num_virt_devs; i++) + dev_pm_domain_detach(hba->virt_devs[i], false); +} + /** * ufshcd_pltfrm_init - probe routine of the driver * @pdev: pointer to Platform device handle @@ -302,7 +340,7 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, struct ufs_hba *hba; void __iomem *mmio_base; struct resource *mem_res; - int irq, err; + int irq, err, num_pds; struct device *dev = &pdev->dev; mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -340,6 +378,16 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, goto dealloc_host; } + num_pds = of_count_phandle_with_args(dev->of_node, "power-domains", + "#power-domain-cells"); + if (num_pds > 1) { + err = ufshcd_attach_pds(&pdev->dev, hba, num_pds); + if (err) { + dev_err(&pdev->dev, "%s: attach of power domains failed %d\n", + __func__, err); + goto dealloc_host; + } + } pm_runtime_get_noresume(&pdev->dev); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); @@ -358,6 +406,8 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, return 0; out_disable_rpm: + if (num_pds > 1) + ufshcd_detach_pds(hba); pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index ecfa898b9ccc..bca1e008f506 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -517,6 +517,9 @@ struct ufs_hba { struct Scsi_Host *host; struct device *dev; + struct device **virt_devs; + u8 num_virt_devs; + /* * This field is to keep a reference to "scsi_device" corresponding to * "UFS device" W-LU.