diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 90760d0ca071..0bec6f66682b 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -967,7 +967,7 @@ drm_vram_helper_mode_valid_internal(struct drm_device *dev,
 
 	max_fbpages = (vmm->vram_size / 2) >> PAGE_SHIFT;
 
-	fbsize = mode->hdisplay * mode->vdisplay * max_bpp;
+	fbsize = (u32)mode->hdisplay * mode->vdisplay * max_bpp;
 	fbpages = DIV_ROUND_UP(fbsize, PAGE_SIZE);
 
 	if (fbpages > max_fbpages)
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index e33c78fc8fbd..b488c91c20a5 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -691,7 +691,7 @@ int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
 		      const struct drm_simple_display_pipe_funcs *funcs,
 		      const struct drm_display_mode *mode, unsigned int rotation)
 {
-	size_t bufsize = mode->vdisplay * mode->hdisplay * sizeof(u16);
+	size_t bufsize = (u32)mode->vdisplay * mode->hdisplay * sizeof(u16);
 
 	dbidev->drm.mode_config.preferred_depth = 16;