Add iova_region_larb_msk for mt8188. We separate the 16GB iova regions
by each device's larbid/portid.
Refer to include/dt-bindings/memory/mediatek,mt8188-memory-port.h

Note: larb19(21) as commented in that h above, it means larb19 while its SW
index is 21.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index a3012fdc8f61..7dc7cd510a8b 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1595,6 +1595,20 @@ static const struct mtk_iommu_plat_data mt8188_data_infra = {
 	.iova_region_nr   = ARRAY_SIZE(single_domain),
 };
 
+static const u32 mt8188_larb_region_msk[MT8192_MULTI_REGION_NR_MAX][MTK_LARB_NR_MAX] = {
+	[0] = {~0, ~0, ~0, ~0},               /* Region0: all ports for larb0/1/2/3 */
+	[1] = {0, 0, 0, 0, 0, 0, 0, 0,
+	       0, 0, 0, 0, 0, 0, 0, 0,
+	       0, 0, 0, 0, 0, ~0, ~0, ~0},    /* Region1: larb19(21)/21(22)/23 */
+	[2] = {0, 0, 0, 0, ~0, ~0, ~0, ~0,    /* Region2: the other larbs. */
+	       ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,
+	       ~0, ~0, ~0, ~0, ~0, 0, 0, 0,
+	       0, ~0},
+	[3] = {0},
+	[4] = {[24] = BIT(0) | BIT(1)},       /* Only larb27(24) port0/1 */
+	[5] = {[24] = BIT(2) | BIT(3)},       /* Only larb27(24) port2/3 */
+};
+
 static const struct mtk_iommu_plat_data mt8188_data_vdo = {
 	.m4u_plat       = M4U_MT8188,
 	.flags          = HAS_BCLK | HAS_SUB_COMM_3BITS | OUT_ORDER_WR_EN |
@@ -1606,6 +1620,7 @@ static const struct mtk_iommu_plat_data mt8188_data_vdo = {
 	.banks_enable   = {true},
 	.iova_region    = mt8192_multi_dom,
 	.iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
+	.iova_region_larb_msk = mt8188_larb_region_msk,
 	.larbid_remap   = {{2}, {0}, {21}, {0}, {19}, {9, 10,
 			   11 /* 11a */, 25 /* 11c */},
 			   {13, 0, 29 /* 16b */, 30 /* 17b */, 0}, {5}},
@@ -1622,6 +1637,7 @@ static const struct mtk_iommu_plat_data mt8188_data_vpp = {
 	.banks_enable   = {true},
 	.iova_region    = mt8192_multi_dom,
 	.iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
+	.iova_region_larb_msk = mt8188_larb_region_msk,
 	.larbid_remap   = {{1}, {3}, {23}, {7}, {MTK_INVALID_LARBID},
 			   {12, 15, 24 /* 11b */}, {14, MTK_INVALID_LARBID,
 			   16 /* 16a */, 17 /* 17a */, MTK_INVALID_LARBID,
-- 
2.18.0