There's a bunch of atomic drivers who don't do this quite correctly, luckily most of them aren't in wide use or people would have noticed the tearing.
By making this the default we avoid the constant audit pain and can additionally remove a ton of lines from vfuncs for a bit more clarity in smaller drivers.
While at it complain if there's a cleanup_fb hook but no prepare_fb hook, because that makes no sense. I haven't found any driver which violates this, but better safe than sorry.
Subsequent patches will reap the benefits.
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 --- drivers/gpu/drm/drm_atomic_helper.c | 10 ++++++++++ drivers/gpu/drm/drm_gem_atomic_helper.c | 3 +++ include/drm/drm_modeset_helper_vtables.h | 7 +++++-- 3 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 531f2374b072..9f6c5f21c4d6 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -35,6 +35,7 @@ #include <drm/drm_damage_helper.h> #include <drm/drm_device.h> #include <drm/drm_drv.h> +#include <drm/drm_gem_atomic_helper.h> #include <drm/drm_plane_helper.h> #include <drm/drm_print.h> #include <drm/drm_self_refresh_helper.h> @@ -2408,6 +2409,15 @@ int drm_atomic_helper_prepare_planes(struct drm_device *dev, ret = funcs->prepare_fb(plane, new_plane_state); if (ret) goto fail; + } else { + WARN_ON_ONCE(funcs->cleanup_fb); + + if (!drm_core_check_feature(dev, DRIVER_GEM)) + continue; + + ret = drm_gem_plane_helper_prepare_fb(plane, new_plane_state); + if (ret) + goto fail; } }
diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c index a27135084ae5..bc9396f2a0ed 100644 --- a/drivers/gpu/drm/drm_gem_atomic_helper.c +++ b/drivers/gpu/drm/drm_gem_atomic_helper.c @@ -135,6 +135,9 @@ * GEM based framebuffer drivers which have their buffers always pinned in * memory. * + * This function is the default implementation for GEM drivers of + * &drm_plane_helper_funcs.prepare_fb if no callback is provided. + * * See drm_atomic_set_fence_for_plane() for a discussion of implicit and * explicit fencing in atomic modeset updates. */ diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h index f3a4b47b3986..4e727261dca5 100644 --- a/include/drm/drm_modeset_helper_vtables.h +++ b/include/drm/drm_modeset_helper_vtables.h @@ -1178,8 +1178,11 @@ struct drm_plane_helper_funcs { * equivalent functionality should be implemented through private * members in the plane structure. * - * Drivers which always have their buffers pinned should use - * drm_gem_plane_helper_prepare_fb() for this hook. + * For GEM drivers who neither have a @prepare_fb not @cleanup_fb hook + * set drm_gem_plane_helper_prepare_fb() is called automatically to + * implement this. Other drivers which need additional plane processing + * can call drm_gem_plane_helper_prepare_fb() from their @prepare_fb + * hook. * * The helpers will call @cleanup_fb with matching arguments for every * successful call to this hook.