drm: Introduce __setplane_atomic()

All the plane->fb/old_fb/crtc dance of __setplane_internal() is
pointless on atomic drivers. So let's just introduce a simpler
version that skips all that.

Ideally we could also skip the __setplane_check() as
drm_atomic_plane_check() already checks for everything, but the
legacy cursor/"async" .update_plane() tricks bypass that so
we still need to call __setplane_check(). Toss in a FIXME to
remind someone to clean this up later.

v2: Use drm_drv_uses_atomic_modeset() (Daniel)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180705185907.9524-1-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 5c97a01..6153cbd 100644 (file)
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -649,6 +649,8 @@ static int __setplane_internal(struct drm_plane *plane,
 {
        int ret = 0;
 
+       WARN_ON(drm_drv_uses_atomic_modeset(plane->dev));
+
        /* No fb means shut it down */
        if (!fb) {
                plane->old_fb = plane->fb;
@@ -673,11 +675,9 @@ static int __setplane_internal(struct drm_plane *plane,
                                         crtc_x, crtc_y, crtc_w, crtc_h,
                                         src_x, src_y, src_w, src_h, ctx);
        if (!ret) {
-               if (!plane->state) {
-                       plane->crtc = crtc;
-                       plane->fb = fb;
-                       drm_framebuffer_get(plane->fb);
-               }
+               plane->crtc = crtc;
+               plane->fb = fb;
+               drm_framebuffer_get(plane->fb);
        } else {
                plane->old_fb = NULL;
        }
@@ -690,6 +690,41 @@ out:
        return ret;
 }
 
+static int __setplane_atomic(struct drm_plane *plane,
+                            struct drm_crtc *crtc,
+                            struct drm_framebuffer *fb,
+                            int32_t crtc_x, int32_t crtc_y,
+                            uint32_t crtc_w, uint32_t crtc_h,
+                            uint32_t src_x, uint32_t src_y,
+                            uint32_t src_w, uint32_t src_h,
+                            struct drm_modeset_acquire_ctx *ctx)
+{
+       int ret;
+
+       WARN_ON(!drm_drv_uses_atomic_modeset(plane->dev));
+
+       /* No fb means shut it down */
+       if (!fb)
+               return plane->funcs->disable_plane(plane, ctx);
+
+       /*
+        * FIXME: This is redundant with drm_atomic_plane_check(),
+        * but the legacy cursor/"async" .update_plane() tricks
+        * don't call that so we still need this here. Should remove
+        * this when all .update_plane() implementations have been
+        * fixed to call drm_atomic_plane_check().
+        */
+       ret = __setplane_check(plane, crtc, fb,
+                              crtc_x, crtc_y, crtc_w, crtc_h,
+                              src_x, src_y, src_w, src_h);
+       if (ret)
+               return ret;
+
+       return plane->funcs->update_plane(plane, crtc, fb,
+                                         crtc_x, crtc_y, crtc_w, crtc_h,
+                                         src_x, src_y, src_w, src_h, ctx);
+}
+
 static int setplane_internal(struct drm_plane *plane,
                             struct drm_crtc *crtc,
                             struct drm_framebuffer *fb,
@@ -707,9 +742,15 @@ retry:
        ret = drm_modeset_lock_all_ctx(plane->dev, &ctx);
        if (ret)
                goto fail;
-       ret = __setplane_internal(plane, crtc, fb,
-                                 crtc_x, crtc_y, crtc_w, crtc_h,
-                                 src_x, src_y, src_w, src_h, &ctx);
+
+       if (drm_drv_uses_atomic_modeset(plane->dev))
+               ret = __setplane_atomic(plane, crtc, fb,
+                                       crtc_x, crtc_y, crtc_w, crtc_h,
+                                       src_x, src_y, src_w, src_h, &ctx);
+       else
+               ret = __setplane_internal(plane, crtc, fb,
+                                         crtc_x, crtc_y, crtc_w, crtc_h,
+                                         src_x, src_y, src_w, src_h, &ctx);
 
 fail:
        if (ret == -EDEADLK) {
@@ -841,9 +882,14 @@ static int drm_mode_cursor_universal(struct drm_crtc *crtc,
                src_h = fb->height << 16;
        }
 
-       ret = __setplane_internal(plane, crtc, fb,
-                                 crtc_x, crtc_y, crtc_w, crtc_h,
-                                 0, 0, src_w, src_h, ctx);
+       if (drm_drv_uses_atomic_modeset(dev))
+               ret = __setplane_atomic(plane, crtc, fb,
+                                       crtc_x, crtc_y, crtc_w, crtc_h,
+                                       0, 0, src_w, src_h, ctx);
+       else
+               ret = __setplane_internal(plane, crtc, fb,
+                                         crtc_x, crtc_y, crtc_w, crtc_h,
+                                         0, 0, src_w, src_h, ctx);
 
        if (fb)
                drm_framebuffer_put(fb);