drm/radeon/kms: disable VGA rendering engine before taking over VRAM
Before we use any of VRAM, we need to disable the VGA rendering
engine, this render text mode into a graphical framebuffer
for scanout, however it does this on vblank, and can end up
overwriting the GART table and r600 shader objects.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 1e1cab5..aafdb8e 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -340,6 +340,10 @@
WREG32(D1VGA_CONTROL, d1vga_control);
WREG32(D2VGA_CONTROL, d2vga_control);
WREG32(VGA_RENDER_CONTROL, vga_render_control);
+
+ /* we need to own VRAM, so turn off the VGA renderer here
+ * to stop it overwriting our objects */
+ radeon_avivo_vga_render_disable(rdev);
}
int r600_mc_init(struct radeon_device *rdev)