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X-UUID: 9be016932b0b47b695a8a04d0e8f8134-20201112 Received: from mtkcas35.mediatek.inc [(172.27.4.253)] by mailgw02.mediatek.com (envelope-from ) (mailgw01.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1625091449; Thu, 12 Nov 2020 10:42:21 +0800 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 12 Nov 2020 10:42:19 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 12 Nov 2020 10:42:19 +0800 Message-ID: <1605148938.26323.127.camel@mhfsdcap03> Subject: Re: [PATCH v4 13/24] iommu/mediatek: Add device link for smi-common and m4u From: Yong Wu To: Nicolas Boichat Date: Thu, 12 Nov 2020 10:42:18 +0800 In-Reply-To: References: <20201111123838.15682-1-yong.wu@mediatek.com> <20201111123838.15682-14-yong.wu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 9DD61C76332B6A687D16ACA0116BA587755327AA8BAE00AF0ECEE2DBB83A02B42000:8 X-MTK: N Cc: youlin.pei@mediatek.com, Devicetree List , srv_heupstream , Tomasz Figa , kernel-team@android.com, lkml , Krzysztof Kozlowski , chao.hao@mediatek.com, iommu@lists.linux-foundation.org, Rob Herring , "moderated list:ARM/Mediatek SoC support" , Evan Green , Matthias Brugger , anan.sun@mediatek.com, Greg Kroah-Hartman , Will Deacon , linux-arm Mailing List , Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Thu, 2020-11-12 at 09:10 +0800, Nicolas Boichat wrote: > On Wed, Nov 11, 2020 at 8:40 PM Yong Wu wrote: > > > > In the lastest SoC, M4U has its special power domain. thus, If the engine > > begin to work, it should help enable the power for M4U firstly. > > Currently if the engine work, it always enable the power/clocks for > > smi-larbs/smi-common. This patch adds device_link for smi-common and M4U. > > then, if smi-common power is enabled, the M4U power also is powered on > > automatically. > > > > Normally M4U connect with several smi-larbs and their smi-common always > > are the same, In this patch it get smi-common dev from the first smi-larb > > device(i==0), then add the device_link only while m4u has power-domain. > > > > Signed-off-by: Yong Wu > > --- > > drivers/iommu/mtk_iommu.c | 36 +++++++++++++++++++++++++++++++++--- > > drivers/iommu/mtk_iommu.h | 1 + > > 2 files changed, 34 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > > index cfdf5ce696fd..4ce7e0883e4d 100644 > > --- a/drivers/iommu/mtk_iommu.c > > +++ b/drivers/iommu/mtk_iommu.c > > @@ -20,6 +20,7 @@ > > #include > > #include > > #include > > +#include > > #include > > #include > > #include > > @@ -705,7 +706,7 @@ static int mtk_iommu_probe(struct platform_device *pdev) > > return larb_nr; > > > > for (i = 0; i < larb_nr; i++) { > > - struct device_node *larbnode; > > + struct device_node *larbnode, *smicomm_node; > > struct platform_device *plarbdev; > > u32 id; > > > > @@ -731,6 +732,26 @@ static int mtk_iommu_probe(struct platform_device *pdev) > > > > component_match_add_release(dev, &match, release_of, > > compare_of, larbnode); > > + if (!i) { > > Maybe more of a style preference, but since you are actually comparing > an integer, I prefer seeing i == 0. > > Also, might be nicer to do > > if (i != 0) > continue; > > And de-indent the rest. Thanks. will fix. > > > + smicomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0); > > + if (!smicomm_node) > > + return -EINVAL; > > + > > + plarbdev = of_find_device_by_node(smicomm_node); > > + of_node_put(smicomm_node); > > + data->smicomm_dev = &plarbdev->dev; > > + } > > + } > > + > > + if (dev->pm_domain) { > > + struct device_link *link; > > + > > + link = device_link_add(data->smicomm_dev, dev, > > + DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME); > > + if (!link) { > > + dev_err(dev, "Unable link %s.\n", dev_name(data->smicomm_dev)); > > + return -EINVAL; > > + } > > } > > > > platform_set_drvdata(pdev, data); > > @@ -738,14 +759,14 @@ static int mtk_iommu_probe(struct platform_device *pdev) > > ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, > > "mtk-iommu.%pa", &ioaddr); > > if (ret) > > - return ret; > > + goto out_link_remove; > > > > iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); > > iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode); > > > > ret = iommu_device_register(&data->iommu); > > if (ret) > > - return ret; > > + goto out_sysfs_remove; > > Technically, this change is unrelated. Sharp eye. Right. I thought it was small enough to squash here. I will use a new patch to fix this(add fixes tag, and no need add cc-stable I think.). > > > > > spin_lock_init(&data->tlb_lock); > > list_add_tail(&data->list, &m4ulist); > > @@ -754,6 +775,13 @@ static int mtk_iommu_probe(struct platform_device *pdev) > > bus_set_iommu(&platform_bus_type, &mtk_iommu_ops); > > > > return component_master_add_with_match(dev, &mtk_iommu_com_ops, match); > > + > > +out_sysfs_remove: > > + iommu_device_sysfs_remove(&data->iommu); > > +out_link_remove: > > + if (dev->pm_domain) > > + device_link_remove(data->smicomm_dev, dev); > > + return ret; > > } > > > > static int mtk_iommu_remove(struct platform_device *pdev) > > @@ -767,6 +795,8 @@ static int mtk_iommu_remove(struct platform_device *pdev) > > bus_set_iommu(&platform_bus_type, NULL); > > > > clk_disable_unprepare(data->bclk); > > + if (pdev->dev.pm_domain) > > + device_link_remove(data->smicomm_dev, &pdev->dev); > > devm_free_irq(&pdev->dev, data->irq, data); > > component_master_del(&pdev->dev, &mtk_iommu_com_ops); > > return 0; > > diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h > > index d0c93652bdbe..5e03a029c4dc 100644 > > --- a/drivers/iommu/mtk_iommu.h > > +++ b/drivers/iommu/mtk_iommu.h > > @@ -68,6 +68,7 @@ struct mtk_iommu_data { > > > > struct iommu_device iommu; > > const struct mtk_iommu_plat_data *plat_data; > > + struct device *smicomm_dev; > > > > struct dma_iommu_mapping *mapping; /* For mtk_iommu_v1.c */ > > > > -- > > 2.18.0 > > > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu