[PATCH] drm/amdgpu/display: fix build with CONFIG_DRM_AMD_DC_DCN disabled

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dc_allow_idle_optimizations() needs to be protected by
CONFIG_DRM_AMD_DC_DCN.

Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 318eb12f8de7..2dc8493793e0 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5490,10 +5490,12 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
 	else
 		dm->active_vblank_irq_count--;
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 	dc_allow_idle_optimizations(
 		adev->dm.dc, dm->active_vblank_irq_count == 0 ? true : false);
 
 	DRM_DEBUG_DRIVER("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0);
+#endif
 
 	mutex_unlock(&dm->dc_lock);
 
-- 
2.29.2

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