From:   Yong Wu <yong.wu@mediatek.com>
To:     Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>
CC:     Robin Murphy <robin.murphy@arm.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Yong Wu <yong.wu@mediatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>, <iommu@lists.linux.dev>,
        <linux-mediatek@lists.infradead.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <mingyuan.ma@mediatek.com>,
        <yf.wang@mediatek.com>, <jianjiao.zeng@mediatek.com>,
        <chengci.xu@mediatek.com>, <youlin.pei@mediatek.com>
Subject: [PATCH v8 4/7] iommu/mediatek: Adjust mtk_iommu_config flow
Date:   Tue, 7 Mar 2023 16:05:52 +0800
Message-ID: <20230307080555.14399-5-yong.wu@mediatek.com>
In-Reply-To: <20230307080555.14399-1-yong.wu@mediatek.com>
References: <20230307080555.14399-1-yong.wu@mediatek.com>
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From: "Chengci.Xu" <chengci.xu@mediatek.com>

For reduce indention without functional change, prepare for MT8188.
If there are many ports in a same larb, current flow will update
larb_mmu->mmu or update INFRA register for too many times.
So we save all ports to portid_msk in the front of mtk_iommu_config(),
and then update only once for IOMMU configure. By this modification,
we can prevent MT8188 from sending to many SMC calls, avoiding enter
ATF for each port.

Signed-off-by: Chengci.Xu <chengci.xu@mediatek.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 58 +++++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 26 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 1bdb0e0022a8..b125e9211a3e 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -583,41 +583,47 @@ static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
 	unsigned int                 larbid, portid;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	const struct mtk_iommu_iova_region *region;
-	u32 peri_mmuen, peri_mmuen_msk;
+	unsigned long portid_msk = 0;
 	int i, ret = 0;
 
 	for (i = 0; i < fwspec->num_ids; ++i) {
-		larbid = MTK_M4U_TO_LARB(fwspec->ids[i]);
 		portid = MTK_M4U_TO_PORT(fwspec->ids[i]);
+		portid_msk |= BIT(portid);
+	}
 
-		if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
-			larb_mmu = &data->larb_imu[larbid];
+	if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_MM)) {
+		/* All ports should be in the same larb. just use 0 here */
+		larbid = MTK_M4U_TO_LARB(fwspec->ids[0]);
+		larb_mmu = &data->larb_imu[larbid];
+		region = data->plat_data->iova_region + regionid;
 
-			region = data->plat_data->iova_region + regionid;
+		for_each_set_bit(portid, &portid_msk, 32)
 			larb_mmu->bank[portid] = upper_32_bits(region->iova_base);
 
-			dev_dbg(dev, "%s iommu for larb(%s) port %d region %d rgn-bank %d.\n",
-				enable ? "enable" : "disable", dev_name(larb_mmu->dev),
-				portid, regionid, larb_mmu->bank[portid]);
-
-			if (enable)
-				larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
-			else
-				larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
-		} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
-			peri_mmuen_msk = BIT(portid);
-			/* PCI dev has only one output id, enable the next writing bit for PCIe */
-			if (dev_is_pci(dev))
-				peri_mmuen_msk |= BIT(portid + 1);
-
-			peri_mmuen = enable ? peri_mmuen_msk : 0;
-			ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
-						 peri_mmuen_msk, peri_mmuen);
-			if (ret)
-				dev_err(dev, "%s iommu(%s) inframaster 0x%x fail(%d).\n",
-					enable ? "enable" : "disable",
-					dev_name(data->dev), peri_mmuen_msk, ret);
+		dev_dbg(dev, "%s iommu for larb(%s) port 0x%lx region %d rgn-bank %d.\n",
+			enable ? "enable" : "disable", dev_name(larb_mmu->dev),
+			portid_msk, regionid, upper_32_bits(region->iova_base));
+
+		if (enable)
+			larb_mmu->mmu |= portid_msk;
+		else
+			larb_mmu->mmu &= ~portid_msk;
+	} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
+		/* PCI dev has only one output id, enable the next writing bit for PCIe */
+		if (dev_is_pci(dev)) {
+			if (fwspec->num_ids != 1) {
+				dev_err(dev, "PCI dev can only have one port.\n");
+				return -ENODEV;
+			}
+			portid_msk |= BIT(portid + 1);
 		}
+
+		ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
+					 (u32)portid_msk, enable ? (u32)portid_msk : 0);
+		if (ret)
+			dev_err(dev, "%s iommu(%s) inframaster 0x%lx fail(%d).\n",
+				enable ? "enable" : "disable",
+				dev_name(data->dev), portid_msk, ret);
 	}
 	return ret;
 }
-- 
2.25.1