drm/atomic: Update legacy DPMS state during modesets, v3.

This is required for DPMS to work correctly, during a modeset
the DPMS property should be turned off, unless the state is
crtc is made active in which case it should be set to DPMS on.

Changes since v1:
- Set DPMS to off when a connector is removed from a crtc too.
- Update the legacy dpms property too.
- Add an exception for the legacy dpms paths, it updates its own state.
Changes since v2:
- Do not preserve dpms property.

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 20 insertions, 6 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 57847ae8ce8c..0b475fae067d 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -660,15 +660,29 @@ drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
         struct drm_crtc_state *old_crtc_state;
         int i;
 
-        /* clear out existing links */
+        /* clear out existing links and update dpms */
         for_each_connector_in_state(old_state, connector, old_conn_state, i) {
-                if (!connector->encoder)
-                        continue;
+                if (connector->encoder) {
+                        WARN_ON(!connector->encoder->crtc);
+
+                        connector->encoder->crtc = NULL;
+                        connector->encoder = NULL;
+                }
 
-                WARN_ON(!connector->encoder->crtc);
+                crtc = connector->state->crtc;
+                if ((!crtc && old_conn_state->crtc) ||
+                    (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
+                        struct drm_property *dpms_prop =
+                                dev->mode_config.dpms_property;
+                        int mode = DRM_MODE_DPMS_OFF;
 
-                connector->encoder->crtc = NULL;
-                connector->encoder = NULL;
+                        if (crtc && crtc->state->active)
+                                mode = DRM_MODE_DPMS_ON;
+
+                        connector->dpms = mode;
+                        drm_object_property_set_value(&connector->base,
+                                                      dpms_prop, mode);
+                }
         }
 
         /* set new links */