1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 7ffc39965233..9c4a6f747552 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1336,6 +1336,9 @@ void __init amd_iommu_detect(void)
                 iommu_detected = 1;
                 amd_iommu_detected = 1;
                 x86_init.iommu.iommu_init = amd_iommu_init;
+
+                /* Make sure ACS will be enabled */
+                pci_request_acs();
         }
 }