From patchwork Thu Jul 6 09:37:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Gautam X-Patchwork-Id: 9827815 X-Patchwork-Delegate: sboyd@codeaurora.org Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 63D9B60317 for ; Thu, 6 Jul 2017 09:38:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 46E08283C9 for ; Thu, 6 Jul 2017 09:38:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 386B728504; Thu, 6 Jul 2017 09:38:06 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham 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 D5E04283C9 for ; Thu, 6 Jul 2017 09:38:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751659AbdGFJhw (ORCPT ); Thu, 6 Jul 2017 05:37:52 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:33782 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752403AbdGFJhp (ORCPT ); Thu, 6 Jul 2017 05:37:45 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 1928860FF0; Thu, 6 Jul 2017 09:37:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1499333864; bh=xWhO+mNR9HoJJGWGHO7z1rGVdt3HffreN90XNINNJks=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KUWOwV/UgD13qcwslWY17hOZo/l+jUjHUrk+Z+KXLXLWWjRQF1f/TKcmVRMTCBnz6 OpEYv0jL+piiCnwG6xdexcc3NYS91ugaU5JrFUPmoezyiv/pESRFOm4Pg2A1mXq+DY 3HWqz8VWE0C+LDSKyu6OaC+V6EJY6Kq4rHLnAUyA= Received: from blr-ubuntu-41.ap.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.1 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: vivek.gautam@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 5363760F8F; Thu, 6 Jul 2017 09:37:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1499333860; bh=xWhO+mNR9HoJJGWGHO7z1rGVdt3HffreN90XNINNJks=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dRRYU9gyRbMk615z5K4u8purlWTrRaakps6WpViGVNhLJZdJyiBCRHJLtpEqKIBX6 nd9Dns5AdiWNiNXQEqL1ZUXHkK3FtR7juUyUyB2E7+aluN3mAzXFucLsZrwCl8XSfP ZqYWnnPnMc42j7OPSFn7OADorMbYLNxgP6HOHMaw= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 5363760F8F 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=vivek.gautam@codeaurora.org From: Vivek Gautam To: joro@8bytes.org, robin.murphy@arm.com, robh+dt@kernel.org, mark.rutland@arm.com, will.deacon@arm.com, m.szyprowski@samsung.com, sboyd@codeaurora.org, robdclark@gmail.com, iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, sricharan@codeaurora.org, stanimir.varbanov@linaro.org, architt@codeaurora.org, vivek.gautam@codeaurora.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH V4 4/6] iommu/arm-smmu: Add the device_link between masters and smmu Date: Thu, 6 Jul 2017 15:07:03 +0530 Message-Id: <1499333825-7658-5-git-send-email-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1499333825-7658-1-git-send-email-vivek.gautam@codeaurora.org> References: <1499333825-7658-1-git-send-email-vivek.gautam@codeaurora.org> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sricharan R Finally add the device link between the master device and smmu, so that the smmu gets runtime enabled/disabled only when the master needs it. This is done from add_device callback which gets called once when the master is added to the smmu. Signed-off-by: Sricharan R --- drivers/iommu/arm-smmu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index ddbfa8ab69e6..75567d9698ab 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1348,6 +1348,7 @@ static int arm_smmu_add_device(struct device *dev) struct arm_smmu_device *smmu; struct arm_smmu_master_cfg *cfg; struct iommu_fwspec *fwspec = dev->iommu_fwspec; + struct device_link *link = NULL; int i, ret; if (using_legacy_binding) { @@ -1403,6 +1404,16 @@ static int arm_smmu_add_device(struct device *dev) pm_runtime_put_sync(smmu->dev); + /* + * Establish the link between smmu and master, so that the + * smmu gets runtime enabled/disabled as per the master's + * needs. + */ + link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME); + if (!link) + dev_warn(smmu->dev, "Unable to create device link between %s and %s\n", + dev_name(smmu->dev), dev_name(dev)); + return 0; out_cfg_free: