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<20200629071310.1557-1-chao.hao@mediatek.com> <20200629071310.1557-10-chao.hao@mediatek.com> From: Matthias Brugger Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP ZqlUsLJ2nOqsmahMTIQ8Mgx9SLEShWqD4kOF4zNfPJsgEMB49KbS2o9jxbGB+JKupjNddfxZ HlH1KF8QwCMZEYaTNogrVazuEJzx6JdRpR3sFda/0x5qjTadwIW6Cl9tkqe2h391dOGX1eOA 1ntn9O/39KqSrWNGvm+1raHK+Ev1yPtn0Wxn+0oy1tl67TxUjQARAQABtClNYXR0aGlhcyBC cnVnZ2VyIDxtYXR0aGlhcy5iZ2dAZ21haWwuY29tPokCUgQTAQIAPAIbAwYLCQgHAwIGFQgC 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wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, Evan Green , iommu@lists.linux-foundation.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org 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 29/06/2020 09:13, Chao Hao wrote: > MT8173 is different from other SoCs for MMU_CTRL register. > For mt8173, its bit9 is in_order_write_en and doesn't use its > default 1'b1.> For other SoCs, bit[12] represents victim_tlb_en feature and > victim_tlb is enable defaultly(bit[12]=1), if we use > "regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR", victim_tlb will be > disabled, it will drop iommu performace. > So we need to deal with the setting of MMU_CTRL separately > for mt8173 and others. > My proposal to rewrite the commit message: The MMU_CTRL regiser of MT8173 is different from other SoCs. The in_order_wr_en is bit[9] which is zero by default. Other SoCs have the vitcim_tlb_en feature mapped to bit[12]. This bit is set to one by default. We need to preserve the bit when setting F_MMU_TF_PROT_TO_PROGRAM_ADDR as otherwise the bit will be cleared and IOMMU performance will drop. > Suggested-by: Matthias Brugger > Suggested-by: Yong Wu > Signed-off-by: Chao Hao > --- > drivers/iommu/mtk_iommu.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 8299a3299090..e46e2deee3fd 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -543,11 +543,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) > return ret; > } > > + regval = readl_relaxed(data->base + REG_MMU_CTRL_REG); The read is only needed in the else branch. > if (data->plat_data->m4u_plat == M4U_MT8173) > regval = F_MMU_PREFETCH_RT_REPLACE_MOD | > F_MMU_TF_PROT_TO_PROGRAM_ADDR_MT8173; > else > - regval = F_MMU_TF_PROT_TO_PROGRAM_ADDR; > + regval |= F_MMU_TF_PROT_TO_PROGRAM_ADDR; > writel_relaxed(regval, data->base + REG_MMU_CTRL_REG); > > regval = F_L2_MULIT_HIT_EN | > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu