Merge tag 'topic/drm-misc-2015-04-15' of git://anongit.freedesktop.org/drm-intel into drm-next

One more drm-misch pull for 4.1 with mostly simple stuff and boring
refactoring. Even the cursor fix from Matt is just to make a really anal
igt happy.

* tag 'topic/drm-misc-2015-04-15' of git://anongit.freedesktop.org/drm-intel:
  drm: fix trivial typo mistake
  drm: Make integer overflow checking cover universal cursor updates (v2)
  drm: make crtc/encoder/connector/plane helper_private a const pointer
  drm/armada: constify struct drm_encoder_helper_funcs pointer
  drm/radeon: constify more struct drm_*_helper funcs pointers
  drm/edid: add #defines for ELD versions
  drm/atomic: Add for_each_{connector,crtc,plane}_in_state helper macros
  drm: Use kref_put_mutex in drm_gem_object_unreference_unlocked
  drm/drm: constify all struct drm_*_helper funcs pointers
  drm/qxl: constify all struct drm_*_helper funcs pointers
  drm/nouveau: constify all struct drm_*_helper funcs pointers
  drm/radeon: constify all struct drm_*_helper funcs pointers
  drm/gma500: constify all struct drm_*_helper funcs pointers
  drm/mgag200: constify all struct drm_*_helper funcs pointers
  drm/exynos: constify all struct drm_*_helper funcs pointers
  drm: Fix some typos

31 files changed, 170 insertions, 299 deletions

diff --git a/drivers/gpu/drm/armada/armada_output.h b/drivers/gpu/drm/armada/armada_output.h
index 4126d43b5057..3c4023e142d0 100644
--- a/drivers/gpu/drm/armada/armada_output.h
+++ b/drivers/gpu/drm/armada/armada_output.h
@@ -9,7 +9,7 @@
 #define ARMADA_CONNETOR_H
 
 #define encoder_helper_funcs(encoder) \
-        ((struct drm_encoder_helper_funcs *)encoder->helper_private)
+        ((const struct drm_encoder_helper_funcs *)encoder->helper_private)
 
 struct armada_output_type {
         int connector_type;
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 57efdbeff008..6e3b78ee7d16 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -780,7 +780,7 @@ drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
 
 /**
- * drm_atomic_set_fb_for_plane - set crtc for plane
+ * drm_atomic_set_fb_for_plane - set framebuffer for plane
  * @plane_state: atomic state object for the plane
  * @fb: fb to use for the plane
  *
@@ -909,14 +909,13 @@ int
 drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
                                struct drm_crtc *crtc)
 {
-        int i, num_connected_connectors = 0;
-
-        for (i = 0; i < state->num_connector; i++) {
-                struct drm_connector_state *conn_state;
+        struct drm_connector *connector;
+        struct drm_connector_state *conn_state;
 
-                conn_state = state->connector_states[i];
+        int i, num_connected_connectors = 0;
 
-                if (conn_state && conn_state->crtc == crtc)
+        for_each_connector_in_state(state, connector, conn_state, i) {
+                if (conn_state->crtc == crtc)
                         num_connected_connectors++;
         }
 
@@ -933,7 +932,7 @@ EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
  *
  * This function should be used by legacy entry points which don't understand
  * -EDEADLK semantics. For simplicity this one will grab all modeset locks after
- *  the slowpath completed.
+ * the slowpath completed.
  */
 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
 {
@@ -968,19 +967,16 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
 {
         struct drm_device *dev = state->dev;
         struct drm_mode_config *config = &dev->mode_config;
-        int nplanes = config->num_total_plane;
-        int ncrtcs = config->num_crtc;
+        struct drm_plane *plane;
+        struct drm_plane_state *plane_state;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *crtc_state;
         int i, ret = 0;
 
         DRM_DEBUG_ATOMIC("checking %p\n", state);
 
-        for (i = 0; i < nplanes; i++) {
-                struct drm_plane *plane = state->planes[i];
-
-                if (!plane)
-                        continue;
-
-                ret = drm_atomic_plane_check(plane, state->plane_states[i]);
+        for_each_plane_in_state(state, plane, plane_state, i) {
+                ret = drm_atomic_plane_check(plane, plane_state);
                 if (ret) {
                         DRM_DEBUG_ATOMIC("[PLANE:%d] atomic core check failed\n",
                                          plane->base.id);
@@ -988,13 +984,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
                 }
         }
 
-        for (i = 0; i < ncrtcs; i++) {
-                struct drm_crtc *crtc = state->crtcs[i];
-
-                if (!crtc)
-                        continue;
-
-                ret = drm_atomic_crtc_check(crtc, state->crtc_states[i]);
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
+                ret = drm_atomic_crtc_check(crtc, crtc_state);
                 if (ret) {
                         DRM_DEBUG_ATOMIC("[CRTC:%d] atomic core check failed\n",
                                          crtc->base.id);
@@ -1006,13 +997,7 @@ int drm_atomic_check_only(struct drm_atomic_state *state)
                 ret = config->funcs->atomic_check(state->dev, state);
 
         if (!state->allow_modeset) {
-                for (i = 0; i < ncrtcs; i++) {
-                        struct drm_crtc *crtc = state->crtcs[i];
-                        struct drm_crtc_state *crtc_state = state->crtc_states[i];
-
-                        if (!crtc)
-                                continue;
-
+                for_each_crtc_in_state(state, crtc, crtc_state, i) {
                         if (crtc_state->mode_changed ||
                             crtc_state->active_changed) {
                                 DRM_DEBUG_ATOMIC("[CRTC:%d] requires full modeset\n",
@@ -1210,6 +1195,8 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
         struct drm_atomic_state *state;
         struct drm_modeset_acquire_ctx ctx;
         struct drm_plane *plane;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *crtc_state;
         unsigned plane_mask = 0;
         int ret = 0;
         unsigned int i, j;
@@ -1313,15 +1300,9 @@ retry:
         }
 
         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
-                int ncrtcs = dev->mode_config.num_crtc;
-
-                for (i = 0; i < ncrtcs; i++) {
-                        struct drm_crtc_state *crtc_state = state->crtc_states[i];
+                for_each_crtc_in_state(state, crtc, crtc_state, i) {
                         struct drm_pending_vblank_event *e;
 
-                        if (!crtc_state)
-                                continue;
-
                         e = create_vblank_event(dev, file_priv, arg->user_data);
                         if (!e) {
                                 ret = -ENOMEM;
@@ -1373,14 +1354,7 @@ fail:
                 goto backoff;
 
         if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
-                int ncrtcs = dev->mode_config.num_crtc;
-
-                for (i = 0; i < ncrtcs; i++) {
-                        struct drm_crtc_state *crtc_state = state->crtc_states[i];
-
-                        if (!crtc_state)
-                                continue;
-
+                for_each_crtc_in_state(state, crtc, crtc_state, i) {
                         destroy_vblank_event(dev, file_priv, crtc_state->event);
                         crtc_state->event = NULL;
                 }
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 41c38edade74..1d2ca52530d5 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -248,30 +248,24 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx)
 static int
 mode_fixup(struct drm_atomic_state *state)
 {
-        int ncrtcs = state->dev->mode_config.num_crtc;
+        struct drm_crtc *crtc;
         struct drm_crtc_state *crtc_state;
+        struct drm_connector *connector;
         struct drm_connector_state *conn_state;
         int i;
         bool ret;
 
-        for (i = 0; i < ncrtcs; i++) {
-                crtc_state = state->crtc_states[i];
-
-                if (!crtc_state || !crtc_state->mode_changed)
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
+                if (!crtc_state->mode_changed)
                         continue;
 
                 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
         }
 
-        for (i = 0; i < state->num_connector; i++) {
+        for_each_connector_in_state(state, connector, conn_state, i) {
                 const struct drm_encoder_helper_funcs *funcs;
                 struct drm_encoder *encoder;
 
-                conn_state = state->connector_states[i];
-
-                if (!conn_state)
-                        continue;
-
                 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
 
                 if (!conn_state->crtc || !conn_state->best_encoder)
@@ -316,14 +310,10 @@ mode_fixup(struct drm_atomic_state *state)
                 }
         }
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc;
 
-                crtc_state = state->crtc_states[i];
-                crtc = state->crtcs[i];
-
-                if (!crtc_state || !crtc_state->mode_changed)
+                if (!crtc_state->mode_changed)
                         continue;
 
                 funcs = crtc->helper_private;
@@ -371,18 +361,13 @@ int
 drm_atomic_helper_check_modeset(struct drm_device *dev,
                                 struct drm_atomic_state *state)
 {
-        int ncrtcs = dev->mode_config.num_crtc;
         struct drm_crtc *crtc;
         struct drm_crtc_state *crtc_state;
+        struct drm_connector *connector;
+        struct drm_connector_state *connector_state;
         int i, ret;
 
-        for (i = 0; i < ncrtcs; i++) {
-                crtc = state->crtcs[i];
-                crtc_state = state->crtc_states[i];
-
-                if (!crtc)
-                        continue;
-
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
                         DRM_DEBUG_ATOMIC("[CRTC:%d] mode changed\n",
                                          crtc->base.id);
@@ -396,7 +381,7 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
                 }
         }
 
-        for (i = 0; i < state->num_connector; i++) {
+        for_each_connector_in_state(state, connector, connector_state, i) {
                 /*
                  * This only sets crtc->mode_changed for routing changes,
                  * drivers must set crtc->mode_changed themselves when connector
@@ -413,15 +398,9 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
          * configuration. This must be done before calling mode_fixup in case a
          * crtc only changed its mode but has the same set of connectors.
          */
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 int num_connectors;
 
-                crtc = state->crtcs[i];
-                crtc_state = state->crtc_states[i];
-
-                if (!crtc)
-                        continue;
-
                 /*
                  * We must set ->active_changed after walking connectors for
                  * otherwise an update that only changes active would result in
@@ -476,17 +455,14 @@ int
 drm_atomic_helper_check_planes(struct drm_device *dev,
                                struct drm_atomic_state *state)
 {
-        int nplanes = dev->mode_config.num_total_plane;
-        int ncrtcs = dev->mode_config.num_crtc;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *crtc_state;
+        struct drm_plane *plane;
+        struct drm_plane_state *plane_state;
         int i, ret = 0;
 
-        for (i = 0; i < nplanes; i++) {
+        for_each_plane_in_state(state, plane, plane_state, i) {
                 const struct drm_plane_helper_funcs *funcs;
-                struct drm_plane *plane = state->planes[i];
-                struct drm_plane_state *plane_state = state->plane_states[i];
-
-                if (!plane)
-                        continue;
 
                 funcs = plane->helper_private;
 
@@ -503,12 +479,8 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
                 }
         }
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc = state->crtcs[i];
-
-                if (!crtc)
-                        continue;
 
                 funcs = crtc->helper_private;
 
@@ -567,22 +539,20 @@ EXPORT_SYMBOL(drm_atomic_helper_check);
 static void
 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 {
-        int ncrtcs = old_state->dev->mode_config.num_crtc;
+        struct drm_connector *connector;
+        struct drm_connector_state *old_conn_state;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *old_crtc_state;
         int i;
 
-        for (i = 0; i < old_state->num_connector; i++) {
+        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
                 const struct drm_encoder_helper_funcs *funcs;
-                struct drm_connector_state *old_conn_state;
-                struct drm_connector *connector;
                 struct drm_encoder *encoder;
                 struct drm_crtc_state *old_crtc_state;
 
-                old_conn_state = old_state->connector_states[i];
-                connector = old_state->connectors[i];
-
                 /* Shut down everything that's in the changeset and currently
                  * still on. So need to check the old, saved state. */
-                if (!old_conn_state || !old_conn_state->crtc)
+                if (!old_conn_state->crtc)
                         continue;
 
                 old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
@@ -623,16 +593,11 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
                         encoder->bridge->funcs->post_disable(encoder->bridge);
         }
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc;
-                struct drm_crtc_state *old_crtc_state;
-
-                crtc = old_state->crtcs[i];
-                old_crtc_state = old_state->crtc_states[i];
 
                 /* Shut down everything that needs a full modeset. */
-                if (!crtc || !needs_modeset(crtc->state))
+                if (!needs_modeset(crtc->state))
                         continue;
 
                 if (!old_crtc_state->active)
@@ -657,16 +622,15 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 static void
 set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
 {
-        int ncrtcs = old_state->dev->mode_config.num_crtc;
+        struct drm_connector *connector;
+        struct drm_connector_state *old_conn_state;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *old_crtc_state;
         int i;
 
         /* clear out existing links */
-        for (i = 0; i < old_state->num_connector; i++) {
-                struct drm_connector *connector;
-
-                connector = old_state->connectors[i];
-
-                if (!connector || !connector->encoder)
+        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
+                if (!connector->encoder)
                         continue;
 
                 WARN_ON(!connector->encoder->crtc);
@@ -676,12 +640,8 @@ set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
         }
 
         /* set new links */
-        for (i = 0; i < old_state->num_connector; i++) {
-                struct drm_connector *connector;
-
-                connector = old_state->connectors[i];
-
-                if (!connector || !connector->state->crtc)
+        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
+                if (!connector->state->crtc)
                         continue;
 
                 if (WARN_ON(!connector->state->best_encoder))
@@ -692,14 +652,7 @@ set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
         }
 
         /* set legacy state in the crtc structure */
-        for (i = 0; i < ncrtcs; i++) {
-                struct drm_crtc *crtc;
-
-                crtc = old_state->crtcs[i];
-
-                if (!crtc)
-                        continue;
-
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 crtc->mode = crtc->state->mode;
                 crtc->enabled = crtc->state->enable;
                 crtc->x = crtc->primary->state->src_x >> 16;
@@ -710,16 +663,16 @@ set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
 static void
 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
 {
-        int ncrtcs = old_state->dev->mode_config.num_crtc;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *old_crtc_state;
+        struct drm_connector *connector;
+        struct drm_connector_state *old_conn_state;
         int i;
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc;
-
-                crtc = old_state->crtcs[i];
 
-                if (!crtc || !crtc->state->mode_changed)
+                if (!crtc->state->mode_changed)
                         continue;
 
                 funcs = crtc->helper_private;
@@ -732,16 +685,13 @@ crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
                 }
         }
 
-        for (i = 0; i < old_state->num_connector; i++) {
+        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
                 const struct drm_encoder_helper_funcs *funcs;
-                struct drm_connector *connector;
                 struct drm_crtc_state *new_crtc_state;
                 struct drm_encoder *encoder;
                 struct drm_display_mode *mode, *adjusted_mode;
 
-                connector = old_state->connectors[i];
-
-                if (!connector || !connector->state->best_encoder)
+                if (!connector->state->best_encoder)
                         continue;
 
                 encoder = connector->state->best_encoder;
@@ -809,17 +759,17 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
                                               struct drm_atomic_state *old_state)
 {
-        int ncrtcs = old_state->dev->mode_config.num_crtc;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *old_crtc_state;
+        struct drm_connector *connector;
+        struct drm_connector_state *old_conn_state;
         int i;
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc;
-
-                crtc = old_state->crtcs[i];
 
                 /* Need to filter out CRTCs where only planes change. */
-                if (!crtc || !needs_modeset(crtc->state))
+                if (!needs_modeset(crtc->state))
                         continue;
 
                 if (!crtc->state->active)
@@ -838,14 +788,11 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
                 }
         }
 
-        for (i = 0; i < old_state->num_connector; i++) {
+        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
                 const struct drm_encoder_helper_funcs *funcs;
-                struct drm_connector *connector;
                 struct drm_encoder *encoder;
 
-                connector = old_state->connectors[i];
-
-                if (!connector || !connector->state->best_encoder)
+                if (!connector->state->best_encoder)
                         continue;
 
                 if (!connector->state->crtc->state->active ||
@@ -879,13 +826,12 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
 static void wait_for_fences(struct drm_device *dev,
                             struct drm_atomic_state *state)
 {
-        int nplanes = dev->mode_config.num_total_plane;
+        struct drm_plane *plane;
+        struct drm_plane_state *plane_state;
         int i;
 
-        for (i = 0; i < nplanes; i++) {
-                struct drm_plane *plane = state->planes[i];
-
-                if (!plane || !plane->state->fence)
+        for_each_plane_in_state(state, plane, plane_state, i) {
+                if (!plane->state->fence)
                         continue;
 
                 WARN_ON(!plane->state->fb);
@@ -902,16 +848,9 @@ static bool framebuffer_changed(struct drm_device *dev,
 {
         struct drm_plane *plane;
         struct drm_plane_state *old_plane_state;
-        int nplanes = old_state->dev->mode_config.num_total_plane;
         int i;
 
-        for (i = 0; i < nplanes; i++) {
-                plane = old_state->planes[i];
-                old_plane_state = old_state->plane_states[i];
-
-                if (!plane)
-                        continue;
-
+        for_each_plane_in_state(old_state, plane, old_plane_state, i) {
                 if (plane->state->crtc != crtc &&
                     old_plane_state->crtc != crtc)
                         continue;
@@ -940,16 +879,9 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
 {
         struct drm_crtc *crtc;
         struct drm_crtc_state *old_crtc_state;
-        int ncrtcs = old_state->dev->mode_config.num_crtc;
         int i, ret;
 
-        for (i = 0; i < ncrtcs; i++) {
-                crtc = old_state->crtcs[i];
-                old_crtc_state = old_state->crtc_states[i];
-
-                if (!crtc)
-                        continue;
-
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 /* No one cares about the old state, so abuse it for tracking
                  * and store whether we hold a vblank reference (and should do a
                  * vblank wait) in the ->enable boolean. */
@@ -974,11 +906,8 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
                 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
         }
 
-        for (i = 0; i < ncrtcs; i++) {
-                crtc = old_state->crtcs[i];
-                old_crtc_state = old_state->crtc_states[i];
-
-                if (!crtc || !old_crtc_state->enable)
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
+                if (!old_crtc_state->enable)
                         continue;
 
                 ret = wait_event_timeout(dev->vblank[i].queue,
@@ -1176,16 +1105,14 @@ EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
 void drm_atomic_helper_commit_planes(struct drm_device *dev,
                                      struct drm_atomic_state *old_state)
 {
-        int nplanes = dev->mode_config.num_total_plane;
-        int ncrtcs = dev->mode_config.num_crtc;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *old_crtc_state;
+        struct drm_plane *plane;
+        struct drm_plane_state *old_plane_state;
         int i;
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc = old_state->crtcs[i];
-
-                if (!crtc)
-                        continue;
 
                 funcs = crtc->helper_private;
 
@@ -1195,13 +1122,8 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
                 funcs->atomic_begin(crtc);
         }
 
-        for (i = 0; i < nplanes; i++) {
+        for_each_plane_in_state(old_state, plane, old_plane_state, i) {
                 const struct drm_plane_helper_funcs *funcs;
-                struct drm_plane *plane = old_state->planes[i];
-                struct drm_plane_state *old_plane_state;
-
-                if (!plane)
-                        continue;
 
                 funcs = plane->helper_private;
 
@@ -1220,12 +1142,8 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
                         funcs->atomic_update(plane, old_plane_state);
         }
 
-        for (i = 0; i < ncrtcs; i++) {
+        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
                 const struct drm_crtc_helper_funcs *funcs;
-                struct drm_crtc *crtc = old_state->crtcs[i];
-
-                if (!crtc)
-                        continue;
 
                 funcs = crtc->helper_private;
 
@@ -1252,18 +1170,14 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
                                       struct drm_atomic_state *old_state)
 {
-        int nplanes = dev->mode_config.num_total_plane;
+        struct drm_plane *plane;
+        struct drm_plane_state *plane_state;
         int i;
 
-        for (i = 0; i < nplanes; i++) {
+        for_each_plane_in_state(old_state, plane, plane_state, i) {
                 const struct drm_plane_helper_funcs *funcs;
-                struct drm_plane *plane = old_state->planes[i];
-                struct drm_plane_state *plane_state = old_state->plane_states[i];
                 struct drm_framebuffer *old_fb;
 
-                if (!plane)
-                        continue;
-
                 funcs = plane->helper_private;
 
                 old_fb = plane_state->fb;
@@ -1512,8 +1426,10 @@ static int update_output_state(struct drm_atomic_state *state,
                                struct drm_mode_set *set)
 {
         struct drm_device *dev = set->crtc->dev;
+        struct drm_crtc *crtc;
+        struct drm_crtc_state *crtc_state;
+        struct drm_connector *connector;
         struct drm_connector_state *conn_state;
-        int ncrtcs = state->dev->mode_config.num_crtc;
         int ret, i, j;
 
         ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
@@ -1529,27 +1445,14 @@ static int update_output_state(struct drm_atomic_state *state,
                         return PTR_ERR(conn_state);
         }
 
-        for (i = 0; i < ncrtcs; i++) {
-                struct drm_crtc *crtc = state->crtcs[i];
-
-                if (!crtc)
-                        continue;
-
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 ret = drm_atomic_add_affected_connectors(state, crtc);
                 if (ret)
                         return ret;
         }
 
         /* Then recompute connector->crtc links and crtc enabling state. */
-        for (i = 0; i < state->num_connector; i++) {
-                struct drm_connector *connector;
-
-                connector = state->connectors[i];
-                conn_state = state->connector_states[i];
-
-                if (!connector)
-                        continue;
-
+        for_each_connector_in_state(state, connector, conn_state, i) {
                 if (conn_state->crtc == set->crtc) {
                         ret = drm_atomic_set_crtc_for_connector(conn_state,
                                                                 NULL);
@@ -1568,13 +1471,7 @@ static int update_output_state(struct drm_atomic_state *state,
                 }
         }
 
-        for (i = 0; i < ncrtcs; i++) {
-                struct drm_crtc *crtc = state->crtcs[i];
-                struct drm_crtc_state *crtc_state = state->crtc_states[i];
-
-                if (!crtc)
-                        continue;
-
+        for_each_crtc_in_state(state, crtc, crtc_state, i) {
                 /* Don't update ->enable for the CRTC in the set_config request,
                  * since a mismatch would indicate a bug in the upper layers.
                  * The actual modeset code later on will catch any
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index b3989e23195e..3403edea9076 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2482,6 +2482,17 @@ static int __setplane_internal(struct drm_plane *plane,
                 goto out;
         }
 
+        /* Give drivers some help against integer overflows */
+        if (crtc_w > INT_MAX ||
+            crtc_x > INT_MAX - (int32_t) crtc_w ||
+            crtc_h > INT_MAX ||
+            crtc_y > INT_MAX - (int32_t) crtc_h) {
+                DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
+                              crtc_w, crtc_h, crtc_x, crtc_y);
+                return -ERANGE;
+        }
+
+
         fb_width = fb->width << 16;
         fb_height = fb->height << 16;
 
@@ -2566,17 +2577,6 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
         if (!drm_core_check_feature(dev, DRIVER_MODESET))
                 return -EINVAL;
 
-        /* Give drivers some help against integer overflows */
-        if (plane_req->crtc_w > INT_MAX ||
-            plane_req->crtc_x > INT_MAX - (int32_t) plane_req->crtc_w ||
-            plane_req->crtc_h > INT_MAX ||
-            plane_req->crtc_y > INT_MAX - (int32_t) plane_req->crtc_h) {
-                DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
-                              plane_req->crtc_w, plane_req->crtc_h,
-                              plane_req->crtc_x, plane_req->crtc_y);
-                return -ERANGE;
-        }
-
         /*
          * First, find the plane, crtc, and fb objects.  If not available,
          * we don't bother to call the driver.
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index dd895c409ca3..ab00286aec93 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -161,7 +161,7 @@ EXPORT_SYMBOL(drm_helper_crtc_in_use);
 static void
 drm_encoder_disable(struct drm_encoder *encoder)
 {
-        struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
 
         if (encoder->bridge)
                 encoder->bridge->funcs->disable(encoder->bridge);
@@ -191,7 +191,7 @@ static void __drm_helper_disable_unused_functions(struct drm_device *dev)
         }
 
         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-                struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                 crtc->enabled = drm_helper_crtc_in_use(crtc);
                 if (!crtc->enabled) {
                         if (crtc_funcs->disable)
@@ -229,7 +229,7 @@ EXPORT_SYMBOL(drm_helper_disable_unused_functions);
 static void
 drm_crtc_prepare_encoders(struct drm_device *dev)
 {
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
         struct drm_encoder *encoder;
 
         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
@@ -271,8 +271,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 {
         struct drm_device *dev = crtc->dev;
         struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
         int saved_x, saved_y;
         bool saved_enabled;
         struct drm_encoder *encoder;
@@ -473,7 +473,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
         bool fb_changed = false; /* if true and !mode_changed just do a flip */
         struct drm_connector *save_connectors, *connector;
         int count = 0, ro, fail = 0;
-        struct drm_crtc_helper_funcs *crtc_funcs;
+        const struct drm_crtc_helper_funcs *crtc_funcs;
         struct drm_mode_set save_set;
         int ret;
         int i;
@@ -573,7 +573,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
         /* a) traverse passed in connector list and get encoders for them */
         count = 0;
         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-                struct drm_connector_helper_funcs *connector_funcs =
+                const struct drm_connector_helper_funcs *connector_funcs =
                         connector->helper_private;
                 new_encoder = connector->encoder;
                 for (ro = 0; ro < set->num_connectors; ro++) {
@@ -733,7 +733,7 @@ static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
         struct drm_bridge *bridge = encoder->bridge;
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
 
         if (bridge) {
                 if (mode == DRM_MODE_DPMS_ON)
@@ -795,7 +795,7 @@ void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
         /* from off to on, do crtc then encoder */
         if (mode < old_dpms) {
                 if (crtc) {
-                        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                         if (crtc_funcs->dpms)
                                 (*crtc_funcs->dpms) (crtc,
                                                      drm_helper_choose_crtc_dpms(crtc));
@@ -809,7 +809,7 @@ void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
                 if (encoder)
                         drm_helper_encoder_dpms(encoder, encoder_dpms);
                 if (crtc) {
-                        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                         if (crtc_funcs->dpms)
                                 (*crtc_funcs->dpms) (crtc,
                                                      drm_helper_choose_crtc_dpms(crtc));
@@ -871,7 +871,7 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
 {
         struct drm_crtc *crtc;
         struct drm_encoder *encoder;
-        struct drm_crtc_helper_funcs *crtc_funcs;
+        const struct drm_crtc_helper_funcs *crtc_funcs;
         int encoder_dpms;
         bool ret;
 
@@ -936,7 +936,7 @@ int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mod
                              struct drm_framebuffer *old_fb)
 {
         struct drm_crtc_state *crtc_state;
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
         int ret;
 
         if (crtc->funcs->atomic_duplicate_state)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 309b9476fe96..cac422916c7a 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -238,7 +238,7 @@ static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
 int drm_fb_helper_debug_enter(struct fb_info *info)
 {
         struct drm_fb_helper *helper = info->par;
-        struct drm_crtc_helper_funcs *funcs;
+        const struct drm_crtc_helper_funcs *funcs;
         int i;
 
         list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
@@ -285,7 +285,7 @@ int drm_fb_helper_debug_leave(struct fb_info *info)
 {
         struct drm_fb_helper *helper = info->par;
         struct drm_crtc *crtc;
-        struct drm_crtc_helper_funcs *funcs;
+        const struct drm_crtc_helper_funcs *funcs;
         struct drm_framebuffer *fb;
         int i;
 
@@ -765,7 +765,7 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
 {
         struct drm_fb_helper *fb_helper = info->par;
         struct drm_device *dev = fb_helper->dev;
-        struct drm_crtc_helper_funcs *crtc_funcs;
+        const struct drm_crtc_helper_funcs *crtc_funcs;
         u16 *red, *green, *blue, *transp;
         struct drm_crtc *crtc;
         int i, j, rc = 0;
@@ -1551,7 +1551,7 @@ static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
         int c, o;
         struct drm_device *dev = fb_helper->dev;
         struct drm_connector *connector;
-        struct drm_connector_helper_funcs *connector_funcs;
+        const struct drm_connector_helper_funcs *connector_funcs;
         struct drm_encoder *encoder;
         int my_score, best_score, score;
         struct drm_fb_helper_crtc **crtcs, *crtc;
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 33807e0adac7..40c1db9ad7c3 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -401,9 +401,9 @@ int drm_plane_helper_commit(struct drm_plane *plane,
                             struct drm_plane_state *plane_state,
                             struct drm_framebuffer *old_fb)
 {
-        struct drm_plane_helper_funcs *plane_funcs;
+        const struct drm_plane_helper_funcs *plane_funcs;
         struct drm_crtc *crtc[2];
-        struct drm_crtc_helper_funcs *crtc_funcs[2];
+        const struct drm_crtc_helper_funcs *crtc_funcs[2];
         int i, ret = 0;
 
         plane_funcs = plane->helper_private;
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 3fee587bc284..63503879a676 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -98,7 +98,7 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect
 {
         struct drm_device *dev = connector->dev;
         struct drm_display_mode *mode;
-        struct drm_connector_helper_funcs *connector_funcs =
+        const struct drm_connector_helper_funcs *connector_funcs =
                 connector->helper_private;
         int count = 0;
         int mode_flags = 0;
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 722cbf32192a..5eba971f394a 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -2101,7 +2101,7 @@ static void hdmi_dpms(struct exynos_drm_display *display, int mode)
         struct hdmi_context *hdata = display_to_hdmi(display);
         struct drm_encoder *encoder = hdata->encoder;
         struct drm_crtc *crtc = encoder->crtc;
-        struct drm_crtc_helper_funcs *funcs = NULL;
+        const struct drm_crtc_helper_funcs *funcs = NULL;
 
         DRM_DEBUG_KMS("mode %d\n", mode);
 
diff --git a/drivers/gpu/drm/gma500/cdv_intel_display.c b/drivers/gpu/drm/gma500/cdv_intel_display.c
index 66727328832d..7d47b3d5cc0d 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_display.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_display.c
@@ -823,7 +823,7 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 
         /* Flush the plane changes */
         {
-                struct drm_crtc_helper_funcs *crtc_funcs =
+                const struct drm_crtc_helper_funcs *crtc_funcs =
                     crtc->helper_private;
                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
         }
diff --git a/drivers/gpu/drm/gma500/cdv_intel_hdmi.c b/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
index 4268bf210034..6b1d3340ba14 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_hdmi.c
@@ -195,7 +195,7 @@ static int cdv_hdmi_set_property(struct drm_connector *connector,
                                             encoder->crtc->x, encoder->crtc->y, encoder->crtc->primary->fb))
                                         return -1;
                         } else {
-                                struct drm_encoder_helper_funcs *helpers
+                                const struct drm_encoder_helper_funcs *helpers
                                                     = encoder->helper_private;
                                 helpers->mode_set(encoder, &crtc->saved_mode,
                                              &crtc->saved_adjusted_mode);
diff --git a/drivers/gpu/drm/gma500/cdv_intel_lvds.c b/drivers/gpu/drm/gma500/cdv_intel_lvds.c
index 0b770396548c..211069b2b951 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c
@@ -505,7 +505,7 @@ static int cdv_intel_lvds_set_property(struct drm_connector *connector,
                 else
                         gma_backlight_set(encoder->dev, value);
         } else if (!strcmp(property->name, "DPMS") && encoder) {
-                struct drm_encoder_helper_funcs *helpers =
+                const struct drm_encoder_helper_funcs *helpers =
                                         encoder->helper_private;
                 helpers->dpms(encoder, value);
         }
diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c
index 9bb9bddd881a..001b450b27b3 100644
--- a/drivers/gpu/drm/gma500/gma_display.c
+++ b/drivers/gpu/drm/gma500/gma_display.c
@@ -501,20 +501,20 @@ bool gma_crtc_mode_fixup(struct drm_crtc *crtc,
 
 void gma_crtc_prepare(struct drm_crtc *crtc)
 {
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 }
 
 void gma_crtc_commit(struct drm_crtc *crtc)
 {
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
 }
 
 void gma_crtc_disable(struct drm_crtc *crtc)
 {
         struct gtt_range *gt;
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
 
         crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
 
@@ -656,7 +656,7 @@ void gma_crtc_restore(struct drm_crtc *crtc)
 
 void gma_encoder_prepare(struct drm_encoder *encoder)
 {
-        struct drm_encoder_helper_funcs *encoder_funcs =
+        const struct drm_encoder_helper_funcs *encoder_funcs =
             encoder->helper_private;
         /* lvds has its own version of prepare see psb_intel_lvds_prepare */
         encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
@@ -664,7 +664,7 @@ void gma_encoder_prepare(struct drm_encoder *encoder)
 
 void gma_encoder_commit(struct drm_encoder *encoder)
 {
-        struct drm_encoder_helper_funcs *encoder_funcs =
+        const struct drm_encoder_helper_funcs *encoder_funcs =
             encoder->helper_private;
         /* lvds has its own version of commit see psb_intel_lvds_commit */
         encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
diff --git a/drivers/gpu/drm/gma500/mdfld_dsi_output.c b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
index abf2248da61e..89f705c3a5eb 100644
--- a/drivers/gpu/drm/gma500/mdfld_dsi_output.c
+++ b/drivers/gpu/drm/gma500/mdfld_dsi_output.c
@@ -290,7 +290,7 @@ static int mdfld_dsi_connector_set_property(struct drm_connector *connector,
                                                 encoder->crtc->primary->fb))
                                         goto set_prop_error;
                         } else {
-                                struct drm_encoder_helper_funcs *funcs =
+                                const struct drm_encoder_helper_funcs *funcs =
                                                 encoder->helper_private;
                                 funcs->mode_set(encoder,
                                         &gma_crtc->saved_mode,
diff --git a/drivers/gpu/drm/gma500/mdfld_intel_display.c b/drivers/gpu/drm/gma500/mdfld_intel_display.c
index 8cc8a5abbc7b..acd38344b302 100644
--- a/drivers/gpu/drm/gma500/mdfld_intel_display.c
+++ b/drivers/gpu/drm/gma500/mdfld_intel_display.c
@@ -849,7 +849,7 @@ static int mdfld_crtc_mode_set(struct drm_crtc *crtc,
 
         /* Flush the plane changes */
         {
-                struct drm_crtc_helper_funcs *crtc_funcs =
+                const struct drm_crtc_helper_funcs *crtc_funcs =
                     crtc->helper_private;
                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
         }
diff --git a/drivers/gpu/drm/gma500/oaktrail_crtc.c b/drivers/gpu/drm/gma500/oaktrail_crtc.c
index 2de216c2374f..1048f0c7c6ce 100644
--- a/drivers/gpu/drm/gma500/oaktrail_crtc.c
+++ b/drivers/gpu/drm/gma500/oaktrail_crtc.c
@@ -483,7 +483,7 @@ static int oaktrail_crtc_mode_set(struct drm_crtc *crtc,
 
         /* Flush the plane changes */
         {
-                struct drm_crtc_helper_funcs *crtc_funcs =
+                const struct drm_crtc_helper_funcs *crtc_funcs =
                     crtc->helper_private;
                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
         }
diff --git a/drivers/gpu/drm/gma500/oaktrail_hdmi.c b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
index 54f73f50571a..2310d879cdc2 100644
--- a/drivers/gpu/drm/gma500/oaktrail_hdmi.c
+++ b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
@@ -347,7 +347,7 @@ int oaktrail_crtc_hdmi_mode_set(struct drm_crtc *crtc,
 
         /* Flush the plane changes */
         {
-                struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                 crtc_funcs->mode_set_base(crtc, x, y, old_fb);
         }
 
diff --git a/drivers/gpu/drm/gma500/psb_intel_display.c b/drivers/gpu/drm/gma500/psb_intel_display.c
index b21a09451d1d..6659da88fe5b 100644
--- a/drivers/gpu/drm/gma500/psb_intel_display.c
+++ b/drivers/gpu/drm/gma500/psb_intel_display.c
@@ -108,7 +108,7 @@ static int psb_intel_crtc_mode_set(struct drm_crtc *crtc,
         struct drm_device *dev = crtc->dev;
         struct drm_psb_private *dev_priv = dev->dev_private;
         struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
         int pipe = gma_crtc->pipe;
         const struct psb_offset *map = &dev_priv->regmap[pipe];
         int refclk;
diff --git a/drivers/gpu/drm/gma500/psb_intel_lvds.c b/drivers/gpu/drm/gma500/psb_intel_lvds.c
index 88aad95bde09..ce0645d0c1e5 100644
--- a/drivers/gpu/drm/gma500/psb_intel_lvds.c
+++ b/drivers/gpu/drm/gma500/psb_intel_lvds.c
@@ -625,7 +625,7 @@ int psb_intel_lvds_set_property(struct drm_connector *connector,
                 else
                         gma_backlight_set(encoder->dev, value);
         } else if (!strcmp(property->name, "DPMS")) {
-                struct drm_encoder_helper_funcs *hfuncs
+                const struct drm_encoder_helper_funcs *hfuncs
                                                 = encoder->helper_private;
                 hfuncs->dpms(encoder, value);
         }
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 9872ba9abf1a..6e84df9369a6 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1222,7 +1222,7 @@ static void mga_crtc_commit(struct drm_crtc *crtc)
 {
         struct drm_device *dev = crtc->dev;
         struct mga_device *mdev = dev->dev_private;
-        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
         u8 tmp;
 
         if (mdev->type == G200_WB)
diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
index 542bb266a0ab..3d96b49fe662 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
@@ -703,7 +703,7 @@ static void nv_crtc_prepare(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct nouveau_drm *drm = nouveau_drm(dev);
         struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
-        struct drm_crtc_helper_funcs *funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *funcs = crtc->helper_private;
 
         if (nv_two_heads(dev))
                 NVSetOwner(dev, nv_crtc->index);
@@ -724,7 +724,7 @@ static void nv_crtc_prepare(struct drm_crtc *crtc)
 static void nv_crtc_commit(struct drm_crtc *crtc)
 {
         struct drm_device *dev = crtc->dev;
-        struct drm_crtc_helper_funcs *funcs = crtc->helper_private;
+        const struct drm_crtc_helper_funcs *funcs = crtc->helper_private;
         struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
 
         nouveau_hw_load_state(dev, nv_crtc->index, &nv04_display(dev)->mode_reg);
diff --git a/drivers/gpu/drm/nouveau/dispnv04/dac.c b/drivers/gpu/drm/nouveau/dispnv04/dac.c
index d7b495a5f30c..af7249ca0f4b 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/dac.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/dac.c
@@ -358,7 +358,7 @@ static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
 
 static void nv04_dac_prepare(struct drm_encoder *encoder)
 {
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
         struct drm_device *dev = encoder->dev;
         int head = nouveau_crtc(encoder->crtc)->index;
 
@@ -409,7 +409,7 @@ static void nv04_dac_commit(struct drm_encoder *encoder)
         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
         struct nouveau_drm *drm = nouveau_drm(encoder->dev);
         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 
         helper->dpms(encoder, DRM_MODE_DPMS_ON);
 
diff --git a/drivers/gpu/drm/nouveau/dispnv04/dfp.c b/drivers/gpu/drm/nouveau/dispnv04/dfp.c
index f6ca343fd34a..7cfb0cbc9b6e 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/dfp.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/dfp.c
@@ -244,7 +244,7 @@ static void nv04_dfp_prepare_sel_clk(struct drm_device *dev,
 static void nv04_dfp_prepare(struct drm_encoder *encoder)
 {
         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
         struct drm_device *dev = encoder->dev;
         int head = nouveau_crtc(encoder->crtc)->index;
         struct nv04_crtc_reg *crtcstate = nv04_display(dev)->mode_reg.crtc_reg;
@@ -445,7 +445,7 @@ static void nv04_dfp_commit(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
         struct nouveau_drm *drm = nouveau_drm(dev);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
         struct dcb_output *dcbe = nv_encoder->dcb;
diff --git a/drivers/gpu/drm/nouveau/dispnv04/disp.c b/drivers/gpu/drm/nouveau/dispnv04/disp.c
index f96237ef2a6b..4131be5507ab 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/disp.c
@@ -109,7 +109,7 @@ nv04_display_create(struct drm_device *dev)
                 crtc->funcs->save(crtc);
 
         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
-                struct drm_encoder_helper_funcs *func = encoder->helper_private;
+                const struct drm_encoder_helper_funcs *func = encoder->helper_private;
 
                 func->save(encoder);
         }
@@ -138,7 +138,7 @@ nv04_display_destroy(struct drm_device *dev)
 
         /* Restore state */
         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
-                struct drm_encoder_helper_funcs *func = encoder->helper_private;
+                const struct drm_encoder_helper_funcs *func = encoder->helper_private;
 
                 func->restore(encoder);
         }
@@ -169,7 +169,7 @@ nv04_display_init(struct drm_device *dev)
          * on suspend too.
          */
         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
-                struct drm_encoder_helper_funcs *func = encoder->helper_private;
+                const struct drm_encoder_helper_funcs *func = encoder->helper_private;
 
                 func->restore(encoder);
         }
diff --git a/drivers/gpu/drm/nouveau/dispnv04/tvnv04.c b/drivers/gpu/drm/nouveau/dispnv04/tvnv04.c
index d9664b37def1..70e95cf6fd19 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/tvnv04.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/tvnv04.c
@@ -122,7 +122,7 @@ static void nv04_tv_prepare(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
         int head = nouveau_crtc(encoder->crtc)->index;
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 
         helper->dpms(encoder, DRM_MODE_DPMS_OFF);
 
@@ -164,7 +164,7 @@ static void nv04_tv_commit(struct drm_encoder *encoder)
         struct drm_device *dev = encoder->dev;
         struct nouveau_drm *drm = nouveau_drm(dev);
         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 
         helper->dpms(encoder, DRM_MODE_DPMS_ON);
 
diff --git a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
index 731d74efc1e5..d9720dda8385 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
@@ -405,7 +405,7 @@ static void nv17_tv_prepare(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
         struct nouveau_drm *drm = nouveau_drm(dev);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
         struct nv17_tv_norm_params *tv_norm = get_tv_norm(encoder);
         int head = nouveau_crtc(encoder->crtc)->index;
         uint8_t *cr_lcd = &nv04_display(dev)->mode_reg.crtc_reg[head].CRTC[
@@ -583,7 +583,7 @@ static void nv17_tv_commit(struct drm_encoder *encoder)
         struct nouveau_drm *drm = nouveau_drm(dev);
         struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
-        struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+        const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
 
         if (get_tv_norm(encoder)->kind == TV_ENC_MODE) {
                 nv17_tv_update_rescaler(encoder);
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index db7095ae4ebb..3162040bc314 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -309,7 +309,7 @@ detect_analog:
                 nv_encoder = find_encoder(connector, DCB_OUTPUT_TV);
         if (nv_encoder && force) {
                 struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
-                struct drm_encoder_helper_funcs *helper =
+                const struct drm_encoder_helper_funcs *helper =
                                                 encoder->helper_private;
 
                 if (helper->detect(encoder, connector) ==
@@ -592,7 +592,7 @@ nouveau_connector_set_property(struct drm_connector *connector,
 static struct drm_display_mode *
 nouveau_connector_native_mode(struct drm_connector *connector)
 {
-        struct drm_connector_helper_funcs *helper = connector->helper_private;
+        const struct drm_connector_helper_funcs *helper = connector->helper_private;
         struct nouveau_drm *drm = nouveau_drm(connector->dev);
         struct nouveau_connector *nv_connector = nouveau_connector(connector);
         struct drm_device *dev = connector->dev;
diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
index 1d9b80c91a15..e2d07085b6a5 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.c
+++ b/drivers/gpu/drm/qxl/qxl_drv.c
@@ -102,7 +102,7 @@ static int qxl_drm_freeze(struct drm_device *dev)
 
         /* unpin the front buffers */
         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-                struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                 if (crtc->enabled)
                         (*crtc_funcs->disable)(crtc);
         }
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 7ffa7d5563b9..cebb65e07e1d 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -157,7 +157,7 @@ int radeon_get_monitor_bpc(struct drm_connector *connector)
                 if (connector->display_info.bpc)
                         bpc = connector->display_info.bpc;
                 else if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE5(rdev)) {
-                        struct drm_connector_helper_funcs *connector_funcs =
+                        const struct drm_connector_helper_funcs *connector_funcs =
                                 connector->helper_private;
                         struct drm_encoder *encoder = connector_funcs->best_encoder(connector);
                         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
@@ -247,7 +247,7 @@ radeon_connector_update_scratch_regs(struct drm_connector *connector, enum drm_c
         struct radeon_device *rdev = dev->dev_private;
         struct drm_encoder *best_encoder = NULL;
         struct drm_encoder *encoder = NULL;
-        struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+        const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
         bool connected;
         int i;
 
@@ -724,7 +724,7 @@ static int radeon_connector_set_property(struct drm_connector *connector, struct
                 if (connector->encoder)
                         radeon_encoder = to_radeon_encoder(connector->encoder);
                 else {
-                        struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+                        const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
                         radeon_encoder = to_radeon_encoder(connector_funcs->best_encoder(connector));
                 }
 
@@ -751,7 +751,7 @@ static int radeon_connector_set_property(struct drm_connector *connector, struct
                 if (connector->encoder)
                         radeon_encoder = to_radeon_encoder(connector->encoder);
                 else {
-                        struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+                        const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
                         radeon_encoder = to_radeon_encoder(connector_funcs->best_encoder(connector));
                 }
 
@@ -762,7 +762,7 @@ static int radeon_connector_set_property(struct drm_connector *connector, struct
 
                 if (connector->encoder->crtc) {
                         struct drm_crtc *crtc  = connector->encoder->crtc;
-                        struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
+                        const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
                         struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
 
                         radeon_crtc->output_csc = radeon_encoder->output_csc;
@@ -942,7 +942,7 @@ static int radeon_lvds_set_property(struct drm_connector *connector,
         if (connector->encoder)
                 radeon_encoder = to_radeon_encoder(connector->encoder);
         else {
-                struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
+                const struct drm_connector_helper_funcs *connector_funcs = connector->helper_private;
                 radeon_encoder = to_radeon_encoder(connector_funcs->best_encoder(connector));
         }
 
@@ -1010,7 +1010,7 @@ radeon_vga_detect(struct drm_connector *connector, bool force)
         struct radeon_device *rdev = dev->dev_private;
         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
         struct drm_encoder *encoder;
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
         bool dret = false;
         enum drm_connector_status ret = connector_status_disconnected;
         int r;
@@ -1140,7 +1140,7 @@ static enum drm_connector_status
 radeon_tv_detect(struct drm_connector *connector, bool force)
 {
         struct drm_encoder *encoder;
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
         enum drm_connector_status ret = connector_status_disconnected;
         int r;
@@ -1220,7 +1220,7 @@ radeon_dvi_detect(struct drm_connector *connector, bool force)
         struct radeon_device *rdev = dev->dev_private;
         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
         struct drm_encoder *encoder = NULL;
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
         int i, r;
         enum drm_connector_status ret = connector_status_disconnected;
         bool dret = false, broken_edid = false;
@@ -1684,7 +1684,7 @@ radeon_dp_detect(struct drm_connector *connector, bool force)
                         if (radeon_ddc_probe(radeon_connector, true)) /* try DDC */
                                 ret = connector_status_connected;
                         else if (radeon_connector->dac_load_detect) { /* try load detection */
-                                struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
+                                const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
                                 ret = encoder_funcs->detect(encoder, connector);
                         }
                 }
diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c
index 5952ff2bb647..1017338a49d9 100644
--- a/drivers/gpu/drm/radeon/radeon_dp_mst.c
+++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c
@@ -604,7 +604,7 @@ radeon_dp_create_fake_mst_encoder(struct radeon_connector *connector)
         struct radeon_encoder *radeon_encoder;
         struct radeon_encoder_mst *mst_enc;
         struct drm_encoder *encoder;
-        struct drm_connector_helper_funcs *connector_funcs = connector->base.helper_private;
+        const struct drm_connector_helper_funcs *connector_funcs = connector->base.helper_private;
         struct drm_encoder *enc_master = connector_funcs->best_encoder(&connector->base);
 
         DRM_DEBUG_KMS("enc master is %p\n", enc_master);
diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
index c89971d904c3..45715307db71 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -36,7 +36,7 @@
 static void radeon_legacy_encoder_disable(struct drm_encoder *encoder)
 {
         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
-        struct drm_encoder_helper_funcs *encoder_funcs;
+        const struct drm_encoder_helper_funcs *encoder_funcs;
 
         encoder_funcs = encoder->helper_private;
         encoder_funcs->dpms(encoder, DRM_MODE_DPMS_OFF);