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SubjectRe: [Patch 1/1] drm/atomic: integrate private objects with suspend/resume helpers
On Thu, Mar 14, 2019 at 08:44:45AM -0500, Benoit Parrot wrote:
> During a suspend cycle the atomic state is saved to be used during the
> restore cycle.
>
> However the current state duplication logic does not duplicate private
> objects. This leads to state inconsistencies at resume time.
>
> With private objects modeset lock now integrated, we can make sure that
> private object state are properly saved and restored.
>
> Signed-off-by: Benoit Parrot <bparrot@ti.com>

Why do you need this? We're doing a full atomic_check, and your
atomic_check should be pulling in any private state objects and
recomputing their states. This smells like papering over a driver bug.

The duplicate helpers should only need to duplicate the uapi-relevant
states, i.e. connector/crtc/planes.
-Daniel

> ---
> drivers/gpu/drm/drm_atomic_helper.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 540a77a2ade9..b108021cc092 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -3189,6 +3189,7 @@ drm_atomic_helper_duplicate_state(struct drm_device *dev,
> struct drm_connector_list_iter conn_iter;
> struct drm_plane *plane;
> struct drm_crtc *crtc;
> + struct drm_private_obj *privobj;
> int err = 0;
>
> state = drm_atomic_state_alloc(dev);
> @@ -3218,6 +3219,16 @@ drm_atomic_helper_duplicate_state(struct drm_device *dev,
> }
> }
>
> + drm_for_each_privobj(privobj, dev) {
> + struct drm_private_state *priv_state;
> +
> + priv_state = drm_atomic_get_private_obj_state(state, privobj);
> + if (IS_ERR(priv_state)) {
> + err = PTR_ERR(priv_state);
> + goto free;
> + }
> + }
> +
> drm_connector_list_iter_begin(dev, &conn_iter);
> drm_for_each_connector_iter(conn, &conn_iter) {
> struct drm_connector_state *conn_state;
> @@ -3325,12 +3336,17 @@ int drm_atomic_helper_commit_duplicated_state(struct drm_atomic_state *state,
> struct drm_connector_state *new_conn_state;
> struct drm_crtc *crtc;
> struct drm_crtc_state *new_crtc_state;
> + struct drm_private_obj *privobj;
> + struct drm_private_state *new_priv_state;
>
> state->acquire_ctx = ctx;
>
> for_each_new_plane_in_state(state, plane, new_plane_state, i)
> state->planes[i].old_state = plane->state;
>
> + for_each_new_private_obj_in_state(state, privobj, new_priv_state, i)
> + state->private_objs[i].old_state = privobj->state;
> +
> for_each_new_crtc_in_state(state, crtc, new_crtc_state, i)
> state->crtcs[i].old_state = crtc->state;
>
> --
> 2.17.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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