Op 30-03-17 om 10:42 schreef Dhinakaran Pandiyan:
> From: "Pandiyan, Dhinakaran" <dhinakaran.pandiyan@xxxxxxxxx>
>
> Having an ->atomic_release callback is useful to release shared resources
> that get allocated in compute_config(). This function is expected to be
> called in the atomic_check() phase before new resources are acquired.
>
> v4: Document that the function is conditionally called and before
> other atomic_checks() (Daniel)
> v3: Use the new 'for_each_oldnew_connector_in_state()' macro.
> v2: Moved the caller hunk to this patch (Daniel)
>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Archit Taneja <architt@xxxxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Harry Wentland <Harry.wentland@xxxxxxx>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 19 +++++++++++++++++++
> include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
> 2 files changed, 35 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index d14094d..9d07669 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -586,6 +586,25 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> }
> }
>
> + for_each_oldnew_connector_in_state(state, connector, old_connector_state, new_connector_state, i) {
> + const struct drm_connector_helper_funcs *conn_funcs;
> + struct drm_crtc_state *crtc_state;
> +
> + conn_funcs = connector->helper_private;
> + if (!conn_funcs->atomic_release)
> + continue;
> +
> + if (!old_connector_state->crtc)
> + continue;
> +
> + crtc_state = drm_atomic_get_existing_crtc_state(state, old_connector_state->crtc);
> +
> + if (crtc_state->connectors_changed ||
> + crtc_state->mode_changed ||
> + (crtc_state->active_changed && !crtc_state->active))
> + conn_funcs->atomic_release(connector, new_connector_state);
> + }
> +
> return mode_fixup(state);
> }
Oops, I'm just looking at patch 5 again..
atomic_release should return an int to allow error propogation. There's no good reason why it shouldn't.
This would allow handling errors in patch 5 more gracefully.
> EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> index 091c422..84e80aa 100644
> --- a/include/drm/drm_modeset_helper_vtables.h
> +++ b/include/drm/drm_modeset_helper_vtables.h
> @@ -836,6 +836,22 @@ struct drm_connector_helper_funcs {
> */
> struct drm_encoder *(*atomic_best_encoder)(struct drm_connector *connector,
> struct drm_connector_state *connector_state);
> +
> + /**
> + * @atomic_release:
> + *
> + * This function is conditionally called to release shared resources
> + * when the attached CRTC's mode changes or it's connectors change or
> + * becomes inactive. It is called before the corresponding
> + * &drm_crtc_helper_funcs.atomic_check or
> + * &drm_crtc_helper_funcs.mode_fixup hooks are called.
> + *
> + * NOTE:
> + *
> + * This function is called in the check phase of an atomic update.
> + */
> + void (*atomic_release)(struct drm_connector *connector,
> + struct drm_connector_state *connector_state);
> };
>
> /**
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