diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index a1b15d0d6c489..8d4c94e893086 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -43,6 +43,10 @@
 #include "amdgpu_hmm.h"
 #include "amdgpu_xgmi.h"
 
+#ifdef CONFIG_ARCH_PHYTIUM
+#include <asm/phytium_cputype.h>
+#endif
+
 static const struct drm_gem_object_funcs amdgpu_gem_object_funcs;
 
 static vm_fault_t amdgpu_gem_fault(struct vm_fault *vmf)
@@ -258,6 +262,11 @@ static int amdgpu_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_str
 	    !(vma->vm_flags & VM_ACCESS_FLAGS))
 		vm_flags_clear(vma, VM_MAYWRITE);
 
+#ifdef CONFIG_ARCH_PHYTIUM
+	/*lt: workaround for bad address error with d3d11 api remoting*/
+	if (is_phytium_soc())
+		vm_flags_set(vma, VM_ALLOW_ANY_UNCACHED);
+#endif
 	return drm_gem_ttm_mmap(obj, vma);
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index c56405b490509..d4f5dfb641c72 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1148,8 +1148,10 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
 	if (ret)
 		return ret;
 
-	for (i = 0; i < ttm->num_pages; ++i)
+	for (i = 0; i < ttm->num_pages; ++i) {
 		ttm->pages[i]->mapping = bdev->dev_mapping;
+		page_ref_inc(ttm->pages[i]);
+	}
 
 	return 0;
 }
@@ -1180,8 +1182,10 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
 	if (ttm->page_flags & TTM_TT_FLAG_EXTERNAL)
 		return;
 
-	for (i = 0; i < ttm->num_pages; ++i)
+	for (i = 0; i < ttm->num_pages; ++i) {
 		ttm->pages[i]->mapping = NULL;
+		page_ref_dec(ttm->pages[i]);
+	}
 
 	adev = amdgpu_ttm_adev(bdev);