drm/kms: add crtc disable function

More explicit than dpms. Same as the encoder disable function.

Need this to explicity disconnect plls from crtcs for reuse when you
plls:crtcs ratio isn't 1:1.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 9b2a54117c9..fa1323ff56b 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -241,7 +241,10 @@ void drm_helper_disable_unused_functions(struct drm_device *dev)
                 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                 crtc->enabled = drm_helper_crtc_in_use(crtc);
                 if (!crtc->enabled) {
-                        crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
+                        if (crtc_funcs->disable)
+                                (*crtc_funcs->disable)(crtc);
+                        else
+                                (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
                         crtc->fb = NULL;
                 }
         }