Re: [Patch 1/1] drm/atomic: integrate private objects with suspend/resume helpers

[Benoit Parrot]

Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> wrote on Thu [2019-Mar-14 17:31:29 +0200]:
> 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@xxxxxx>
> > ---
> >  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;
> 
> Random order between crtc vs. plane vs. connector vs. priv is tickling
> my ocd nerve a bit.

These loops are independent from each other.
And even without this patch the order is different between
drm_atomic_helper_duplicate_state() and
drm_atomic_helper_commit_duplicated_state(). :)

Benoit

> 
> Otherwise looks sensible to me.
> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> 
> >  
> > -- 
> > 2.17.1
> > 
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> 
> -- 
> Ville Syrjälä
> Intel