From: Damien Lespiau <[email protected]>

A left over from:
  drm/i915: Don't try to use SPR_SCALE when we don't have a sprite scaler

We also need to avoid to reset this register in _disable()

Signed-off-by: Damien Lespiau <[email protected]>
---
 drivers/gpu/drm/i915/intel_sprite.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_sprite.c 
b/drivers/gpu/drm/i915/intel_sprite.c
index ccfaa6f..fa68e2a 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -153,7 +153,8 @@ ivb_disable_plane(struct drm_plane *plane)
 
        I915_WRITE(SPRCTL(pipe), I915_READ(SPRCTL(pipe)) & ~SPRITE_ENABLE);
        /* Can't leave the scaler enabled... */
-       I915_WRITE(SPRSCALE(pipe), 0);
+       if (intel_plane->can_scale)
+               I915_WRITE(SPRSCALE(pipe), 0);
        /* Activate double buffered register update */
        I915_MODIFY_DISPBASE(SPRSURF(pipe), 0);
        POSTING_READ(SPRSURF(pipe));
-- 
1.7.11.7

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