Merge tag 'topic/drm-fixes-2015-11-19' of git://anongit.freedesktop.org/drm-intel into drm-fixes

Here are some drm core fixes for v4.4 that I've picked up. Atomic fixes
from Maarten, and atomic helper fixes from Ville and Daniel.

Admittedly the topmost commit didn't sit in our tree for very long, but
does come with reviews and testing from trustworthy people.

* tag 'topic/drm-fixes-2015-11-19' of git://anongit.freedesktop.org/drm-intel:
  drm/atomic-helper: Check encoder/crtc constraints
  drm: Fix primary plane size for stereo doubled modes for legacy setcrtc
  drm/core: Fix old_fb handling in pan_display_atomic.
  drm/core: Fix old_fb handling in restore_fbdev_mode_atomic.
  drm/atomic: add a drm_atomic_clean_old_fb helper.
  drm/core: Fix old_fb handling in drm_mode_atomic_ioctl.
  drm/core: Set legacy_cursor_update in drm_atomic_helper_disable_plane.

3 files changed, 76 insertions, 65 deletions

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 7bb3845d9974..aeee083c7f95 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1432,6 +1432,45 @@ static int atomic_set_prop(struct drm_atomic_state *state,
         return ret;
 }
 
+/**
+ * drm_atomic_update_old_fb -- Unset old_fb pointers and set plane->fb pointers.
+ *
+ * @dev: drm device to check.
+ * @plane_mask: plane mask for planes that were updated.
+ * @ret: return value, can be -EDEADLK for a retry.
+ *
+ * Before doing an update plane->old_fb is set to plane->fb,
+ * but before dropping the locks old_fb needs to be set to NULL
+ * and plane->fb updated. This is a common operation for each
+ * atomic update, so this call is split off as a helper.
+ */
+void drm_atomic_clean_old_fb(struct drm_device *dev,
+                             unsigned plane_mask,
+                             int ret)
+{
+        struct drm_plane *plane;
+
+        /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
+         * locks (ie. while it is still safe to deref plane->state).  We
+         * need to do this here because the driver entry points cannot
+         * distinguish between legacy and atomic ioctls.
+         */
+        drm_for_each_plane_mask(plane, dev, plane_mask) {
+                if (ret == 0) {
+                        struct drm_framebuffer *new_fb = plane->state->fb;
+                        if (new_fb)
+                                drm_framebuffer_reference(new_fb);
+                        plane->fb = new_fb;
+                        plane->crtc = plane->state->crtc;
+
+                        if (plane->old_fb)
+                                drm_framebuffer_unreference(plane->old_fb);
+                }
+                plane->old_fb = NULL;
+        }
+}
+EXPORT_SYMBOL(drm_atomic_clean_old_fb);
+
 int drm_mode_atomic_ioctl(struct drm_device *dev,
                           void *data, struct drm_file *file_priv)
 {
@@ -1446,7 +1485,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
         struct drm_plane *plane;
         struct drm_crtc *crtc;
         struct drm_crtc_state *crtc_state;
-        unsigned plane_mask = 0;
+        unsigned plane_mask;
         int ret = 0;
         unsigned int i, j;
 
@@ -1486,6 +1525,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
         state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
 
 retry:
+        plane_mask = 0;
         copied_objs = 0;
         copied_props = 0;
 
@@ -1576,24 +1616,7 @@ retry:
         }
 
 out:
-        /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
-         * locks (ie. while it is still safe to deref plane->state).  We
-         * need to do this here because the driver entry points cannot
-         * distinguish between legacy and atomic ioctls.
-         */
-        drm_for_each_plane_mask(plane, dev, plane_mask) {
-                if (ret == 0) {
-                        struct drm_framebuffer *new_fb = plane->state->fb;
-                        if (new_fb)
-                                drm_framebuffer_reference(new_fb);
-                        plane->fb = new_fb;
-                        plane->crtc = plane->state->crtc;
-
-                        if (plane->old_fb)
-                                drm_framebuffer_unreference(plane->old_fb);
-                }
-                plane->old_fb = NULL;
-        }
+        drm_atomic_clean_old_fb(dev, plane_mask, ret);
 
         if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
                 /*
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 0c6f62168776..e5aec45bf985 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -210,6 +210,14 @@ update_connector_routing(struct drm_atomic_state *state, int conn_idx)
                 return -EINVAL;
         }
 
+        if (!drm_encoder_crtc_ok(new_encoder, connector_state->crtc)) {
+                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d]\n",
+                                 new_encoder->base.id,
+                                 new_encoder->name,
+                                 connector_state->crtc->base.id);
+                return -EINVAL;
+        }
+
         if (new_encoder == connector_state->best_encoder) {
                 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
                                  connector->base.id,
@@ -1553,6 +1561,9 @@ retry:
                 goto fail;
         }
 
+        if (plane_state->crtc && (plane == plane->crtc->cursor))
+                plane_state->state->legacy_cursor_update = true;
+
         ret = __drm_atomic_helper_disable_plane(plane, plane_state);
         if (ret != 0)
                 goto fail;
@@ -1605,9 +1616,6 @@ int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
         plane_state->src_h = 0;
         plane_state->src_w = 0;
 
-        if (plane->crtc && (plane == plane->crtc->cursor))
-                plane_state->state->legacy_cursor_update = true;
-
         return 0;
 }
 
@@ -1741,6 +1749,7 @@ int __drm_atomic_helper_set_config(struct drm_mode_set *set,
         struct drm_crtc_state *crtc_state;
         struct drm_plane_state *primary_state;
         struct drm_crtc *crtc = set->crtc;
+        int hdisplay, vdisplay;
         int ret;
 
         crtc_state = drm_atomic_get_crtc_state(state, crtc);
@@ -1783,19 +1792,21 @@ int __drm_atomic_helper_set_config(struct drm_mode_set *set,
         if (ret != 0)
                 return ret;
 
+        drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay);
+
         drm_atomic_set_fb_for_plane(primary_state, set->fb);
         primary_state->crtc_x = 0;
         primary_state->crtc_y = 0;
-        primary_state->crtc_h = set->mode->vdisplay;
-        primary_state->crtc_w = set->mode->hdisplay;
+        primary_state->crtc_h = vdisplay;
+        primary_state->crtc_w = hdisplay;
         primary_state->src_x = set->x << 16;
         primary_state->src_y = set->y << 16;
         if (primary_state->rotation & (BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_270))) {
-                primary_state->src_h = set->mode->hdisplay << 16;
-                primary_state->src_w = set->mode->vdisplay << 16;
+                primary_state->src_h = hdisplay << 16;
+                primary_state->src_w = vdisplay << 16;
         } else {
-                primary_state->src_h = set->mode->vdisplay << 16;
-                primary_state->src_w = set->mode->hdisplay << 16;
+                primary_state->src_h = vdisplay << 16;
+                primary_state->src_w = hdisplay << 16;
         }
 
 commit:
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index e673c13c7391..69cbab5e5c81 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -342,6 +342,7 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
         struct drm_plane *plane;
         struct drm_atomic_state *state;
         int i, ret;
+        unsigned plane_mask;
 
         state = drm_atomic_state_alloc(dev);
         if (!state)
@@ -349,11 +350,10 @@ static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper)
 
         state->acquire_ctx = dev->mode_config.acquire_ctx;
 retry:
+        plane_mask = 0;
         drm_for_each_plane(plane, dev) {
                 struct drm_plane_state *plane_state;
 
-                plane->old_fb = plane->fb;
-
                 plane_state = drm_atomic_get_plane_state(state, plane);
                 if (IS_ERR(plane_state)) {
                         ret = PTR_ERR(plane_state);
@@ -362,6 +362,9 @@ retry:
 
                 plane_state->rotation = BIT(DRM_ROTATE_0);
 
+                plane->old_fb = plane->fb;
+                plane_mask |= 1 << drm_plane_index(plane);
+
                 /* disable non-primary: */
                 if (plane->type == DRM_PLANE_TYPE_PRIMARY)
                         continue;
@@ -382,19 +385,7 @@ retry:
         ret = drm_atomic_commit(state);
 
 fail:
-        drm_for_each_plane(plane, dev) {
-                if (ret == 0) {
-                        struct drm_framebuffer *new_fb = plane->state->fb;
-                        if (new_fb)
-                                drm_framebuffer_reference(new_fb);
-                        plane->fb = new_fb;
-                        plane->crtc = plane->state->crtc;
-
-                        if (plane->old_fb)
-                                drm_framebuffer_unreference(plane->old_fb);
-                }
-                plane->old_fb = NULL;
-        }
+        drm_atomic_clean_old_fb(dev, plane_mask, ret);
 
         if (ret == -EDEADLK)
                 goto backoff;
@@ -1236,7 +1227,9 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
         struct drm_fb_helper *fb_helper = info->par;
         struct drm_device *dev = fb_helper->dev;
         struct drm_atomic_state *state;
+        struct drm_plane *plane;
         int i, ret;
+        unsigned plane_mask;
 
         state = drm_atomic_state_alloc(dev);
         if (!state)
@@ -1244,19 +1237,22 @@ static int pan_display_atomic(struct fb_var_screeninfo *var,
 
         state->acquire_ctx = dev->mode_config.acquire_ctx;
 retry:
+        plane_mask = 0;
         for(i = 0; i < fb_helper->crtc_count; i++) {
                 struct drm_mode_set *mode_set;
 
                 mode_set = &fb_helper->crtc_info[i].mode_set;
 
-                mode_set->crtc->primary->old_fb = mode_set->crtc->primary->fb;
-
                 mode_set->x = var->xoffset;
                 mode_set->y = var->yoffset;
 
                 ret = __drm_atomic_helper_set_config(mode_set, state);
                 if (ret != 0)
                         goto fail;
+
+                plane = mode_set->crtc->primary;
+                plane_mask |= drm_plane_index(plane);
+                plane->old_fb = plane->fb;
         }
 
         ret = drm_atomic_commit(state);
@@ -1268,26 +1264,7 @@ retry:
 
 
 fail:
-        for(i = 0; i < fb_helper->crtc_count; i++) {
-                struct drm_mode_set *mode_set;
-                struct drm_plane *plane;
-
-                mode_set = &fb_helper->crtc_info[i].mode_set;
-                plane = mode_set->crtc->primary;
-
-                if (ret == 0) {
-                        struct drm_framebuffer *new_fb = plane->state->fb;
-
-                        if (new_fb)
-                                drm_framebuffer_reference(new_fb);
-                        plane->fb = new_fb;
-                        plane->crtc = plane->state->crtc;
-
-                        if (plane->old_fb)
-                                drm_framebuffer_unreference(plane->old_fb);
-                }
-                plane->old_fb = NULL;
-        }
+        drm_atomic_clean_old_fb(dev, plane_mask, ret);
 
         if (ret == -EDEADLK)
                 goto backoff;