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drm/simple-helper: drm_gem_simple_display_pipe_prepare_fb as default

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It's tedious to review this all the time, and my audit showed that
arcpgu actually forgot to set this.

Make this the default and stop worrying.

Again I sprinkled WARN_ON_ONCE on top to make sure we don't have
strange combinations of hooks: cleanup_fb without prepare_fb doesn't
make sense, and since simpler drivers are all new they better be GEM
based drivers.

v2: Warn and bail when it's _not_ a GEM driver (Noralf)

v3: It's neither ... nor, not not (Sam)

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210623162456.3373469-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2021-06-23 18:24:56 +02:00
parent 942d8344d5
commit 40cfc7fce4
2 changed files with 15 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpu/drm/drm_simple_kms_helper.c
View file

@ -9,6 +9,8 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
@ -225,8 +227,14 @@ static int drm_simple_kms_plane_prepare_fb(struct drm_plane *plane,
struct drm_simple_display_pipe *pipe;
pipe = container_of(plane, struct drm_simple_display_pipe, plane);
if (!pipe->funcs || !pipe->funcs->prepare_fb)
return 0;
if (!pipe->funcs || !pipe->funcs->prepare_fb) {
if (WARN_ON_ONCE(!drm_core_check_feature(plane->dev, DRIVER_GEM)))
return 0;
WARN_ON_ONCE(pipe->funcs && pipe->funcs->cleanup_fb);
return drm_gem_simple_display_pipe_prepare_fb(pipe, state);
}
return pipe->funcs->prepare_fb(pipe, state);
}

7
include/drm/drm_simple_kms_helper.h
View file

@ -116,8 +116,11 @@ struct drm_simple_display_pipe_funcs {
* the documentation for the &drm_plane_helper_funcs.prepare_fb hook for
* more details.
*
* Drivers which always have their buffers pinned should use
* drm_gem_simple_display_pipe_prepare_fb() for this hook.
* For GEM drivers who neither have a @prepare_fb nor @cleanup_fb hook
* set drm_gem_simple_display_pipe_prepare_fb() is called automatically
* to implement this. Other drivers which need additional plane
* processing can call drm_gem_simple_display_pipe_prepare_fb() from
* their @prepare_fb hook.
*/
int (*prepare_fb)(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);