This patch will remove the usage of the m4u_dom variable.

We have already redefined mtk_iommu_domain structure and it
includes iommu_domain, so m4u_dom variable will not be used.

Signed-off-by: Chao Hao <chao.hao@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 8d68a1af8ed5..42fad1cf73f3 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -113,6 +113,7 @@
  * Get the local arbiter ID and the portid within the larb arbiter
  * from mtk_m4u_id which is defined by MTK_M4U_ID.
  */
+#define MTK_M4U_ID(larb, port)		(((larb) << 5) | (port))
 #define MTK_M4U_TO_LARB(id)		(((id) >> 5) & 0xf)
 #define MTK_M4U_TO_PORT(id)		((id) & 0x1f)
 
@@ -205,6 +206,22 @@ static u32 mtk_iommu_get_domain_id(struct device *dev)
 	return get_domain_id(data, portid);
 }
 
+static struct iommu_domain *_get_mtk_domain(struct mtk_iommu_data *data,
+					    u32 larbid, u32 portid)
+{
+	u32 domain_id;
+	u32 port_mask = MTK_M4U_ID(larbid, portid);
+	struct mtk_iommu_domain *dom;
+
+	domain_id = get_domain_id(data, port_mask);
+
+	list_for_each_entry(dom, &data->pgtable->m4u_dom_v2, list) {
+		if (dom->id == domain_id)
+			return &dom->domain;
+	}
+	return NULL;
+}
+
 static struct mtk_iommu_domain *get_mtk_domain(struct device *dev)
 {
 	struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv;
@@ -307,7 +324,7 @@ static const struct iommu_flush_ops mtk_iommu_flush_ops = {
 static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
 {
 	struct mtk_iommu_data *data = dev_id;
-	struct mtk_iommu_domain *dom = data->m4u_dom;
+	struct iommu_domain *domain;
 	u32 int_state, regval, fault_iova, fault_pa;
 	unsigned int fault_larb, fault_port, sub_comm = 0;
 	bool layer, write;
@@ -342,7 +359,8 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
 
 	fault_larb = data->plat_data->larbid_remap[data->m4u_id][fault_larb];
 
-	if (report_iommu_fault(&dom->domain, data->dev, fault_iova,
+	domain = _get_mtk_domain(data, fault_larb, fault_port);
+	if (report_iommu_fault(domain, data->dev, fault_iova,
 			       write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
 		dev_err_ratelimited(
 			data->dev,
@@ -512,16 +530,11 @@ static void mtk_iommu_domain_free(struct iommu_domain *domain)
 static int mtk_iommu_attach_device(struct iommu_domain *domain,
 				   struct device *dev)
 {
-	struct mtk_iommu_domain *dom = to_mtk_domain(domain);
 	struct mtk_iommu_data *data = dev_iommu_fwspec_get(dev)->iommu_priv;
 
 	if (!data)
 		return -ENODEV;
 
-	/* Update the pgtable base address register of the M4U HW */
-	if (!data->m4u_dom)
-		data->m4u_dom = dom;
-
 	mtk_iommu_config(data, dev, true);
 	return 0;
 }
-- 
2.18.0

