drm/doc: fix drm_plane_type docs

The docs for enum drm_plane_type mention legacy IOCTLs, however the
plane type is not tied to legacy IOCTLs, the drm_cursor.primary and
cursor fields are. Add a small paragraph to reference these.

Instead, document expectations for primary and cursor planes for
non-legacy userspace. Note that these docs are for driver developers,
not userspace developers, so internal kernel APIs are mentionned.

Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115110626.12233-1-contact@emersion.fr

diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 8ef06ee..95ab14a 100644 (file)
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -538,10 +538,14 @@ struct drm_plane_funcs {
  *
  * For compatibility with legacy userspace, only overlay planes are made
  * available to userspace by default. Userspace clients may set the
- * DRM_CLIENT_CAP_UNIVERSAL_PLANES client capability bit to indicate that they
+ * &DRM_CLIENT_CAP_UNIVERSAL_PLANES client capability bit to indicate that they
  * wish to receive a universal plane list containing all plane types. See also
  * drm_for_each_legacy_plane().
  *
+ * In addition to setting each plane's type, drivers need to setup the
+ * &drm_crtc.primary and optionally &drm_crtc.cursor pointers for legacy
+ * IOCTLs. See drm_crtc_init_with_planes().
+ *
  * WARNING: The values of this enum is UABI since they're exposed in the "type"
  * property.
  */
@@ -557,19 +561,20 @@ enum drm_plane_type {
        /**
         * @DRM_PLANE_TYPE_PRIMARY:
         *
-        * Primary planes represent a "main" plane for a CRTC.  Primary planes
-        * are the planes operated upon by CRTC modesetting and flipping
-        * operations described in the &drm_crtc_funcs.page_flip and
-        * &drm_crtc_funcs.set_config hooks.
+        * A primary plane attached to a CRTC is the most likely to be able to
+        * light up the CRTC when no scaling/cropping is used and the plane
+        * covers the whole CRTC.
         */
        DRM_PLANE_TYPE_PRIMARY,
 
        /**
         * @DRM_PLANE_TYPE_CURSOR:
         *
-        * Cursor planes represent a "cursor" plane for a CRTC.  Cursor planes
-        * are the planes operated upon by the DRM_IOCTL_MODE_CURSOR and
-        * DRM_IOCTL_MODE_CURSOR2 IOCTLs.
+        * A cursor plane attached to a CRTC is more likely to be able to be
+        * enabled when no scaling/cropping is used and the framebuffer has the
+        * size indicated by &drm_mode_config.cursor_width and
+        * &drm_mode_config.cursor_height. Additionally, if the driver doesn't
+        * support modifiers, the framebuffer should have a linear layout.
         */
        DRM_PLANE_TYPE_CURSOR,
 };