From 09cdc2f57da2241f2213b3d76ccda5ea2d7e67c7 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Tue, 8 Sep 2026 16:47:01 +0200 Subject: drm/exynos: Convert to atomic_create_state The plane reset implementation creates a custom state subclass, but only initializes a pristine state without resetting any hardware. This is equivalent to what atomic_create_state expects. Convert to it. The conversion was done using the following Coccinelle semantic patch: @@ identifier funcs; symbol drm_atomic_helper_plane_reset; symbol drm_atomic_helper_plane_create_state; @@ struct drm_plane_funcs funcs = { ..., - .reset = drm_atomic_helper_plane_reset, + .atomic_create_state = drm_atomic_helper_plane_create_state, ..., }; @match_struct_reset@ identifier funcs, reset_func; @@ struct drm_plane_funcs funcs = { ..., .reset = reset_func, ..., }; @reset_uses_helpers depends on match_struct_reset@ identifier match_struct_reset.reset_func; @@ void reset_func(...) { <+... ( __drm_atomic_helper_plane_reset(...); | __drm_gem_reset_shadow_plane(...); ) ...+> } @match_struct_destroy@ identifier funcs, destroy_func; @@ struct drm_plane_funcs funcs = { ..., .atomic_destroy_state = destroy_func, ..., }; @script:python renamed_func@ old_name << match_struct_reset.reset_func; new_name; @@ if old_name.endswith("_reset"): coccinelle.new_name = old_name.replace("_reset", "_create_state") else: coccinelle.new_name = old_name @update_struct depends on match_struct_reset && reset_uses_helpers@ identifier match_struct_reset.funcs, match_struct_reset.reset_func; identifier renamed_func.new_name; @@ struct drm_plane_funcs funcs = { ..., - .reset = reset_func, + .atomic_create_state = new_name, ..., }; @drop_destroy depends on update_struct && match_struct_destroy@ identifier match_struct_reset.reset_func; identifier match_struct_destroy.destroy_func; identifier container_func; identifier P; symbol drm_atomic_helper_plane_destroy_state; symbol __drm_atomic_helper_plane_destroy_state; @@ void reset_func(struct drm_plane *P) { ... ( - if (P->state) { - <+... ( - drm_atomic_helper_plane_destroy_state(P, P->state); | - __drm_atomic_helper_plane_destroy_state(P->state); | - P->funcs->atomic_destroy_state(P, P->state); | - destroy_func(P, P->state); ) - ...+> - } | - drm_WARN_ON_ONCE(P->dev, P->state); | - WARN_ON(P->state); ) ... ( - kfree(P->state); | - kfree(container_func(P->state)); | // kfree is optional ) ( - P->state = NULL; | // plane->state clearing is optional ) ... } @drop_destroy_mtk depends on update_struct@ identifier P; symbol __drm_atomic_helper_plane_destroy_state; symbol to_mtk_plane_state; @@ void mtk_plane_reset(struct drm_plane *P) { ... - if (P->state) { - __drm_atomic_helper_plane_destroy_state(P->state); - ... - } else { ... - } ... } @transform_nv50_wndw depends on update_struct@ identifier S; @@ void nv50_wndw_reset(...) { ... - if (WARN_ON(!(S = kzalloc_obj(*S)))) + S = kzalloc_obj(*S); + if (WARN_ON(!S)) return; ... } @transform_kzalloc depends on update_struct@ identifier match_struct_reset.reset_func; identifier P, S; statement ST; statement list STL; @@ void reset_func(struct drm_plane *P) { <... S = kzalloc_obj(*S); ( - if (S) - { - STL - } + if (!S) return; + + STL | - if (S) ST + if (!S) return; + + ST ) ...> } @transform_body depends on update_struct@ identifier match_struct_reset.reset_func; identifier renamed_func.new_name; identifier S, P; expression PS; @@ - void reset_func(struct drm_plane *P) + struct drm_plane_state *new_name(struct drm_plane *P) { ... S = kzalloc_obj(*S); ... ( if (!S) { ... - return; + return ERR_PTR(-ENOMEM); } | if (WARN_ON(!S)) { ... - return; + return ERR_PTR(-ENOMEM); } | if (S == NULL) { ... - return; + return ERR_PTR(-ENOMEM); } ) ... ( - __drm_atomic_helper_plane_reset(P, PS); + __drm_atomic_helper_plane_state_init(PS, P); | - __drm_gem_reset_shadow_plane(P, PS); + __drm_gem_shadow_plane_state_init(P, PS); ) ... } @update_early_return depends on update_struct@ identifier match_struct_reset.reset_func; identifier renamed_func.new_name; identifier P; expression PS; @@ struct drm_plane_state *new_name(struct drm_plane *P) { <+... - return; + return ERR_PTR(-EINVAL); ...+> } @update_return_plane depends on update_struct@ identifier match_struct_reset.reset_func; identifier renamed_func.new_name; identifier P; expression PS; @@ struct drm_plane_state *new_name(struct drm_plane *P) { ... __drm_atomic_helper_plane_state_init(PS, P); ... + + return PS; } @update_return_shadow depends on update_struct@ identifier renamed_func.new_name; identifier P; expression PS; @@ struct drm_plane_state *new_name(struct drm_plane *P) { ... __drm_gem_shadow_plane_state_init(P, PS); ... + + return &PS->base; } Reviewed-by: Thomas Zimmermann Link: https://patch.msgid.link/20260908-drm-no-more-plane-reset-v4-30-a31b3fcfc989@kernel.org Signed-off-by: Maxime Ripard --- drivers/gpu/drm/exynos/exynos_drm_plane.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c index 5c04ef87e400..020e8c9cf7de 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_plane.c +++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c @@ -122,23 +122,19 @@ static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state) exynos_state->crtc.w, exynos_state->crtc.h); } -static void exynos_drm_plane_reset(struct drm_plane *plane) +static struct drm_plane_state *exynos_drm_plane_create_state(struct drm_plane *plane) { struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane); struct exynos_drm_plane_state *exynos_state; - if (plane->state) { - exynos_state = to_exynos_plane_state(plane->state); - __drm_atomic_helper_plane_destroy_state(plane->state); - kfree(exynos_state); - plane->state = NULL; - } - exynos_state = kzalloc_obj(*exynos_state); - if (exynos_state) { - __drm_atomic_helper_plane_reset(plane, &exynos_state->base); - plane->state->zpos = exynos_plane->config->zpos; - } + if (!exynos_state) + return ERR_PTR(-ENOMEM); + + __drm_atomic_helper_plane_state_init(&exynos_state->base, plane); + exynos_state->base.zpos = exynos_plane->config->zpos; + + return &exynos_state->base; } static struct drm_plane_state * @@ -169,7 +165,7 @@ static struct drm_plane_funcs exynos_plane_funcs = { .update_plane = drm_atomic_helper_update_plane, .disable_plane = drm_atomic_helper_disable_plane, .destroy = drm_plane_cleanup, - .reset = exynos_drm_plane_reset, + .atomic_create_state = exynos_drm_plane_create_state, .atomic_duplicate_state = exynos_drm_plane_duplicate_state, .atomic_destroy_state = exynos_drm_plane_destroy_state, }; -- cgit v1.2.3