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drm/atomic-helper: Make zpos property kerneldoc less misleading

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kerneldoc for drm_plane_create_zpos_property() says that the DRM core
will automatically calculate the normalized zpos values, but it doesn't
actually do that anymore since commit 38d868e41c ("drm: Don't force
all planes to be added to the state due to zpos"). Instead, drivers are
supposed to explicitly call the drm_atomic_normalize_zpos() function.
Change the kerneldoc comment to reflect that.

v2: reference the commit that introduced the kerneldoc unclarity

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171120150959.26913-1-thierry.reding@gmail.com
This commit is contained in:
Thierry Reding 2017-11-20 16:09:59 +01:00
parent 170178fe99
commit ca40cfc85e
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/drm_blend.c
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@ -214,9 +214,11 @@ EXPORT_SYMBOL(drm_rotation_simplify);
* This function initializes generic mutable zpos property and enables support
* for it in drm core. Drivers can then attach this property to planes to enable
* support for configurable planes arrangement during blending operation.
* Once mutable zpos property has been enabled, the DRM core will automatically
* calculate &drm_plane_state.normalized_zpos values. Usually min should be set
* to 0 and max to maximal number of planes for given crtc - 1.
* Drivers that attach a mutable zpos property to any plane should call the
* drm_atomic_normalize_zpos() helper during their implementation of
* &drm_mode_config_funcs.atomic_check(), which will update the normalized zpos
* values and store them in &drm_plane_state.normalized_zpos. Usually min
* should be set to 0 and max to maximal number of planes for given crtc - 1.
*
* If zpos of some planes cannot be changed (like fixed background or
* cursor/topmost planes), driver should adjust min/max values and assign those