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Fri, 10 Jul 2020 06:49:40 -0700 (PDT) Subject: Re: [PATCH v6 07/10] iommu/mediatek: Add REG_MMU_WR_LEN_CTRL register definition To: Chao Hao , Joerg Roedel , Rob Herring References: <20200703044127.27438-1-chao.hao@mediatek.com> <20200703044127.27438-8-chao.hao@mediatek.com> From: Matthias Brugger Message-ID: <2500e311-983a-2d79-cd31-a9ff948b2883@gmail.com> Date: Fri, 10 Jul 2020 15:49:39 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200703044127.27438-8-chao.hao@mediatek.com> Content-Language: en-US Cc: devicetree@vger.kernel.org, FY Yang , wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, TH Yang , 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 03/07/2020 06:41, Chao Hao wrote: > Some platforms(ex: mt6779) need to improve performance by setting > REG_MMU_WR_LEN_CTRL register. And we can use WR_THROT_EN macro to control > whether we need to set the register. If the register uses default value, > iommu will send command to EMI without restriction, when the number of > commands become more and more, it will drop the EMI performance. So when > more than ten_commands(default value) don't be handled for EMI, iommu will > stop send command to EMI for keeping EMI's performace by enabling write > throttling mechanism(bit[5][21]=0) in MMU_WR_LEN_CTRL register. > > Cc: Matthias Brugger > Signed-off-by: Chao Hao Reviewed-by: Matthias Brugger > --- > drivers/iommu/mtk_iommu.c | 11 +++++++++++ > drivers/iommu/mtk_iommu.h | 1 + > 2 files changed, 12 insertions(+) > > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c > index 0d96dcd8612b..5c8e141668fc 100644 > --- a/drivers/iommu/mtk_iommu.c > +++ b/drivers/iommu/mtk_iommu.c > @@ -46,6 +46,8 @@ > #define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19)) > > #define REG_MMU_DCM_DIS 0x050 > +#define REG_MMU_WR_LEN_CTRL 0x054 > +#define F_MMU_WR_THROT_DIS_MASK (BIT(5) | BIT(21)) > > #define REG_MMU_CTRL_REG 0x110 > #define F_MMU_TF_PROT_TO_PROGRAM_ADDR (2 << 4) > @@ -112,6 +114,7 @@ > #define RESET_AXI BIT(3) > #define OUT_ORDER_WR_EN BIT(4) > #define HAS_SUB_COMM BIT(5) > +#define WR_THROT_EN BIT(6) > > #define MTK_IOMMU_HAS_FLAG(pdata, _x) \ > ((((pdata)->flags) & (_x)) == (_x)) > @@ -593,6 +596,12 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data) > writel_relaxed(regval, data->base + REG_MMU_VLD_PA_RNG); > } > writel_relaxed(0, data->base + REG_MMU_DCM_DIS); > + if (MTK_IOMMU_HAS_FLAG(data->plat_data, WR_THROT_EN)) { > + /* write command throttling mode */ > + regval = readl_relaxed(data->base + REG_MMU_WR_LEN_CTRL); > + regval &= ~F_MMU_WR_THROT_DIS_MASK; > + writel_relaxed(regval, data->base + REG_MMU_WR_LEN_CTRL); > + } > > if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) { > /* The register is called STANDARD_AXI_MODE in this case */ > @@ -747,6 +756,7 @@ static int __maybe_unused mtk_iommu_suspend(struct device *dev) > struct mtk_iommu_suspend_reg *reg = &data->reg; > void __iomem *base = data->base; > > + reg->wr_len_ctrl = readl_relaxed(base + REG_MMU_WR_LEN_CTRL); > reg->misc_ctrl = readl_relaxed(base + REG_MMU_MISC_CTRL); > reg->dcm_dis = readl_relaxed(base + REG_MMU_DCM_DIS); > reg->ctrl_reg = readl_relaxed(base + REG_MMU_CTRL_REG); > @@ -771,6 +781,7 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev) > dev_err(data->dev, "Failed to enable clk(%d) in resume\n", ret); > return ret; > } > + writel_relaxed(reg->wr_len_ctrl, base + REG_MMU_WR_LEN_CTRL); > writel_relaxed(reg->misc_ctrl, base + REG_MMU_MISC_CTRL); > writel_relaxed(reg->dcm_dis, base + REG_MMU_DCM_DIS); > writel_relaxed(reg->ctrl_reg, base + REG_MMU_CTRL_REG); > diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h > index 46d0d47b22e1..31edd05e2eb1 100644 > --- a/drivers/iommu/mtk_iommu.h > +++ b/drivers/iommu/mtk_iommu.h > @@ -31,6 +31,7 @@ struct mtk_iommu_suspend_reg { > u32 int_main_control; > u32 ivrp_paddr; > u32 vld_pa_rng; > + u32 wr_len_ctrl; > }; > > enum mtk_iommu_plat { > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu