drm/nv10/plane: add downscaling restrictions

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/dispnv04/overlay.c b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
index 514a3055903c1d277049fc82dc7302b826430447..c14afb79414708e0664e38a0fcf1ead53b03f7fd 100644 (file)
--- a/drivers/gpu/drm/nouveau/dispnv04/overlay.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
@@ -112,7 +112,15 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
        format = ALIGN(src_w * 4, 0x100);
 
        if (format > 0xffff)
-               return -EINVAL;
+               return -ERANGE;
+
+       if (dev->chipset >= 0x30) {
+               if (crtc_w < (src_w >> 1) || crtc_h < (src_h >> 1))
+                       return -ERANGE;
+       } else {
+               if (crtc_w < (src_w >> 3) || crtc_h < (src_h >> 3))
+                       return -ERANGE;
+       }
 
        ret = nouveau_bo_pin(nv_fb->nvbo, TTM_PL_FLAG_VRAM);
        if (ret)