[PATCH] drm/amdgpu: assign dpms for amdgpu_vkms_crtc_helper_funcs

[Asher Song]

To avoid NULL pointer, assign dpms for amdgpu_vkms_crtc_helper_funcs.

Signed-off-by: Asher Song <asher.s...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 26 +++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
index 50bdc39733aa..920b6bc1a9fc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
@@ -155,8 +155,32 @@ static void amdgpu_vkms_crtc_atomic_flush(struct drm_crtc 
*crtc,
                crtc->state->event = NULL;
        }
 }
-
+static void amdgpu_vkms_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+       struct drm_device *dev = crtc->dev;
+       struct amdgpu_device *adev = drm_to_adev(dev);
+       struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
+       unsigned type;
+
+       switch (mode) {
+       case DRM_MODE_DPMS_ON:
+               amdgpu_crtc->enabled = true;
+               /* Make sure VBLANK interrupts are still enabled */
+               type = amdgpu_display_crtc_idx_to_irq_type(adev,
+                                               amdgpu_crtc->crtc_id);
+               amdgpu_irq_update(adev, &adev->crtc_irq, type);
+               drm_crtc_vblank_on(crtc);
+               break;
+       case DRM_MODE_DPMS_STANDBY:
+       case DRM_MODE_DPMS_SUSPEND:
+       case DRM_MODE_DPMS_OFF:
+               drm_crtc_vblank_off(crtc);
+               amdgpu_crtc->enabled = false;
+               break;
+       }
+}
 static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = {
+       .dpms = amdgpu_vkms_crtc_dpms,
        .atomic_flush   = amdgpu_vkms_crtc_atomic_flush,
        .atomic_enable  = amdgpu_vkms_crtc_atomic_enable,
        .atomic_disable = amdgpu_vkms_crtc_atomic_disable,
-- 
2.25.1