linux-kernel - [Patch 1/1] drm/atomic: integrate private objects with suspend/resume helpers

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Date:   Thu, 14 Mar 2019 08:44:45 -0500
From:   Benoit Parrot <bparrot@...com>
To:     Daniel Vetter <daniel@...ll.ch>, Rob Clark <robdclark@...il.com>,
        <dri-devel@...ts.freedesktop.org>
CC:     <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Jyri Sarha <jsarha@...com>, Benoit Parrot <bparrot@...com>
Subject: [Patch 1/1] drm/atomic: integrate private objects with suspend/resume helpers

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@...com>
---
 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