From: Thomas Zimmermann tzimmermann@suse.de
[ Upstream commit dbbf933d365da1a76a540211bee3d57bde520194 ]
In drm_atomic_helper_check_crtc_state(), do not add a new plane state to the global state if it does not exist already. Adding a new plane state will result in overhead for the plane during the atomic-commit step.
For the test in drm_atomic_helper_check_crtc_state() to succeed, it is important that the CRTC has an enabled primary plane after the commit. Simply testing the CRTC state's plane_mask for a primary plane is sufficient.
Note that the helper still only tests for an attached primary plane. Drivers have to ensure that the plane contains valid pixel information.
v5: * fix commit description (Javier) v3: * test for a primary plane in plane_mask (Ville) v2: * remove unnecessary test for plane->crtc (Ville) * inline drm_atomic_get_next_plane_state() (Ville) * acquire plane lock before accessing plane->state (Ville)
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Javier Martinez Canillas javierm@redhat.com Fixes: d6b9af1097fe ("drm/atomic-helper: Add helper drm_atomic_helper_check_crtc_state()") Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Jocelyn Falempe jfalempe@redhat.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org Link: https://patchwork.freedesktop.org/patch/msgid/20221007124338.24152-2-tzimmer... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_atomic_helper.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 8bf41aa24068..6526d6ade04b 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -899,7 +899,6 @@ int drm_atomic_helper_check_crtc_state(struct drm_crtc_state *crtc_state, bool can_disable_primary_planes) { struct drm_device *dev = crtc_state->crtc->dev; - struct drm_atomic_state *state = crtc_state->state;
if (!crtc_state->enable) return 0; @@ -910,14 +909,7 @@ int drm_atomic_helper_check_crtc_state(struct drm_crtc_state *crtc_state, struct drm_plane *plane;
drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { - struct drm_plane_state *plane_state; - - if (plane->type != DRM_PLANE_TYPE_PRIMARY) - continue; - plane_state = drm_atomic_get_plane_state(state, plane); - if (IS_ERR(plane_state)) - return PTR_ERR(plane_state); - if (plane_state->fb && plane_state->crtc) { + if (plane->type == DRM_PLANE_TYPE_PRIMARY) { has_primary_plane = true; break; }