1 files changed, 45 insertions, 22 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 3cc63e2..5a170cb 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -632,6 +632,13 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
 	iommu->last_device = calc_devid(MMIO_GET_BUS(range),
 					MMIO_GET_LD(range));
 	iommu->evt_msi_num = MMIO_MSI_NUM(misc);
+
+	if (is_rd890_iommu(iommu->dev)) {
+		pci_read_config_dword(iommu->dev, 0xf0, &iommu->cache_cfg[0]);
+		pci_read_config_dword(iommu->dev, 0xf4, &iommu->cache_cfg[1]);
+		pci_read_config_dword(iommu->dev, 0xf8, &iommu->cache_cfg[2]);
+		pci_read_config_dword(iommu->dev, 0xfc, &iommu->cache_cfg[3]);
+	}
 }
 
 /*
@@ -649,29 +656,9 @@ static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
 	struct ivhd_entry *e;
 
 	/*
-	 * First set the recommended feature enable bits from ACPI
-	 * into the IOMMU control registers
+	 * First save the recommended feature enable bits from ACPI
 	 */
-	h->flags & IVHD_FLAG_HT_TUN_EN_MASK ?
-		iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
-		iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
-
-	h->flags & IVHD_FLAG_PASSPW_EN_MASK ?
-		iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
-		iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
-
-	h->flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
-		iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
-		iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
-
-	h->flags & IVHD_FLAG_ISOC_EN_MASK ?
-		iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
-		iommu_feature_disable(iommu, CONTROL_ISOC_EN);
-
-	/*
-	 * make IOMMU memory accesses cache coherent
-	 */
-	iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
+	iommu->acpi_flags = h->flags;
 
 	/*
 	 * Done. Now parse the device entries
@@ -1116,6 +1103,40 @@ static void init_device_table(void)
 	}
 }
 
+static void iommu_init_flags(struct amd_iommu *iommu)
+{
+	iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
+		iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
+		iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
+
+	iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
+		iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
+		iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
+
+	iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
+		iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
+		iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
+
+	iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
+		iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
+		iommu_feature_disable(iommu, CONTROL_ISOC_EN);
+
+	/*
+	 * make IOMMU memory accesses cache coherent
+	 */
+	iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
+}
+
+static void iommu_apply_quirks(struct amd_iommu *iommu)
+{
+	if (is_rd890_iommu(iommu->dev)) {
+		pci_write_config_dword(iommu->dev, 0xf0, iommu->cache_cfg[0]);
+		pci_write_config_dword(iommu->dev, 0xf4, iommu->cache_cfg[1]);
+		pci_write_config_dword(iommu->dev, 0xf8, iommu->cache_cfg[2]);
+		pci_write_config_dword(iommu->dev, 0xfc, iommu->cache_cfg[3]);
+	}
+}
+
 /*
  * This function finally enables all IOMMUs found in the system after
  * they have been initialized
@@ -1126,6 +1147,8 @@ static void enable_iommus(void)
 
 	for_each_iommu(iommu) {
 		iommu_disable(iommu);
+		iommu_apply_quirks(iommu);
+		iommu_init_flags(iommu);
 		iommu_set_device_table(iommu);
 		iommu_enable_command_buffer(iommu);
 		iommu_enable_event_buffer(iommu);