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Wed, 27 Feb 2019 22:34:43 +0800 Message-ID: <1551278083.17917.53.camel@mhfsdcap03> Subject: Re: [PATCH 04/13] iommu/mediatek: Add device_link between the consumer and the larb devices From: Yong Wu To: Evan Green Date: Wed, 27 Feb 2019 22:34:43 +0800 In-Reply-To: References: <1546318276-18993-1-git-send-email-yong.wu@mediatek.com> <1546318276-18993-5-git-send-email-yong.wu@mediatek.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190227_063506_746371_F1C93E36 X-CRM114-Status: GOOD ( 25.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Nicolas Boichat , Arnd Bergmann , srv_heupstream@mediatek.com, Greg Kroah-Hartman , Joerg Roedel , Will Deacon , LKML , Tomasz Figa , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, Matthias Brugger , yingjoe.chen@mediatek.com, Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2019-02-25 at 15:54 -0800, Evan Green wrote: > On Mon, Dec 31, 2018 at 8:52 PM Yong Wu wrote: > > > > MediaTek IOMMU don't have its power-domain. all the consumer connect > > with smi-larb, then connect with smi-common. > > > > M4U > > | > > smi-common > > | > > ------------- > > | | ... > > | | > > larb1 larb2 > > | | > > vdec venc > > > > When the consumer works, it should enable the smi-larb's power which > > also need enable the smi-common's power firstly. > > > > Thus, First of all, use the device link connect the consumer and the > > smi-larbs. then add device link between the smi-larb and smi-common. > > > > This patch adds device_link between the consumer and the larbs. > > > > Suggested-by: Tomasz Figa > > Signed-off-by: Yong Wu > > --- > > drivers/iommu/mtk_iommu.c | 15 +++++++++++++-- > > drivers/iommu/mtk_iommu_v1.c | 14 ++++++++++++-- > > 2 files changed, 25 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > > index 202e41b..735ae8d 100644 > > --- a/drivers/iommu/mtk_iommu.c > > +++ b/drivers/iommu/mtk_iommu.c > > @@ -247,6 +247,7 @@ static void mtk_iommu_config(struct mtk_iommu_data *data, > > struct mtk_smi_larb_iommu *larb_mmu; > > unsigned int larbid, portid; > > struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > > + struct device_link *link; > > int i; > > > > for (i = 0; i < fwspec->num_ids; ++i) { > > @@ -257,10 +258,20 @@ static void mtk_iommu_config(struct mtk_iommu_data *data, > > dev_dbg(dev, "%s iommu port: %d\n", > > enable ? "enable" : "disable", portid); > > > > - if (enable) > > + if (enable) { > > larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); > > - else > > + /* Link the consumer with the larb device(supplier) */ > > + link = device_link_add(dev, larb_mmu->dev, > > + DL_FLAG_PM_RUNTIME | > > + DL_FLAG_AUTOREMOVE_CONSUMER); > > + if (!link) { > > + dev_err(dev, "Unable to link %s\n", > > + dev_name(larb_mmu->dev)); > > + return; > > The return is a little odd here, given that you don't return an error > and this function doesn't do anything else. If it's non-fatal that > this link didn't get set up, then remove the return. If it is fatal, > then return an error code. I will remove the "return". Thanks. > > > + } > > + } else { > > larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); > > + } > > } > > } > > > > diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c > > index 9386aee..022bad9 100644 > > --- a/drivers/iommu/mtk_iommu_v1.c > > +++ b/drivers/iommu/mtk_iommu_v1.c > > @@ -201,6 +201,7 @@ static void mtk_iommu_config(struct mtk_iommu_data *data, > > struct mtk_smi_larb_iommu *larb_mmu; > > unsigned int larbid, portid; > > struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > > + struct device_link *link; > > int i; > > > > for (i = 0; i < fwspec->num_ids; ++i) { > > @@ -211,10 +212,19 @@ static void mtk_iommu_config(struct mtk_iommu_data *data, > > dev_dbg(dev, "%s iommu port: %d\n", > > enable ? "enable" : "disable", portid); > > > > - if (enable) > > + if (enable) { > > larb_mmu->mmu |= MTK_SMI_MMU_EN(portid); > > - else > > + link = device_link_add(dev, larb_mmu->dev, > > + DL_FLAG_PM_RUNTIME | > > + DL_FLAG_AUTOREMOVE_CONSUMER); > > + if (!link) { > > + dev_err(dev, "Unable to link %s\n", > > + dev_name(larb_mmu->dev)); > > + return; > > Same for this one. > > > + } > > + } else { > > larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid); > > + } > > } > > } > > > > -- > > 1.9.1 > > > > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel