@@ -249,6 +249,8 @@ static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
}
}
+ mutex_lock(&rcrtc->group->lock);
+
/* Select display timing and dot clock generator 2 for planes associated
* with superposition controller 2.
*/
@@ -260,15 +262,19 @@ static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
* split, or through a module parameter). Flicker would then
* occur only if we need to break the pre-association.
*/
- mutex_lock(&rcrtc->group->lock);
if (rcar_du_group_read(rcrtc->group, DPTSR) != dptsr) {
rcar_du_group_write(rcrtc->group, DPTSR, dptsr);
if (rcrtc->group->used_crtcs)
rcar_du_group_restart(rcrtc->group);
}
- mutex_unlock(&rcrtc->group->lock);
}
+ /* Restart the group if plane sources have changed. */
+ if (rcrtc->group->planes.need_restart)
+ rcar_du_group_restart(rcrtc->group);
+
+ mutex_unlock(&rcrtc->group->lock);
+
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR,
dspr);
}
@@ -154,6 +154,8 @@ void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)
void rcar_du_group_restart(struct rcar_du_group *rgrp)
{
+ rgrp->planes.need_restart = false;
+
__rcar_du_group_start_stop(rgrp, false);
__rcar_du_group_start_stop(rgrp, true);
}
@@ -357,9 +357,27 @@ static void rcar_du_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct rcar_du_plane *rplane = to_rcar_plane(plane);
+ struct rcar_du_plane_state *old_rstate;
+ struct rcar_du_plane_state *new_rstate;
- if (plane->state->crtc)
- rcar_du_plane_setup(rplane);
+ if (!plane->state->crtc)
+ return;
+
+ rcar_du_plane_setup(rplane);
+
+ /* Check whether the source has changed from memory to live source or
+ * from live source to memory. The source has been configured by the
+ * VSPS bit in the PnDDCR4 register. Although the datasheet states that
+ * the bit is updated during vertical blanking, it seems that updates
+ * only occur when the DU group is held in reset through the DSYSR.DRES
+ * bit. We thus need to restart the group if the source changes.
+ */
+ old_rstate = to_rcar_du_plane_state(old_state);
+ new_rstate = to_rcar_du_plane_state(plane->state);
+
+ if ((old_rstate->source == RCAR_DU_PLANE_MEMORY) !=
+ (new_rstate->source == RCAR_DU_PLANE_MEMORY))
+ rplane->group->planes.need_restart = true;
}
static const struct drm_plane_helper_funcs rcar_du_plane_helper_funcs = {
@@ -47,6 +47,7 @@ static inline struct rcar_du_plane *to_rcar_plane(struct drm_plane *plane)
struct rcar_du_planes {
struct rcar_du_plane planes[RCAR_DU_NUM_KMS_PLANES];
+ bool need_restart;
struct drm_property *alpha;
struct drm_property *colorkey;
Plane sources are configured by the VSPS bit in the PnDDCR4 register. Although the datasheet states that the bit is updated during vertical blanking, it seems that updates only occur when the DU group is held in reset through the DSYSR.DRES bit. Restart the group if the source changes. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 10 ++++++++-- drivers/gpu/drm/rcar-du/rcar_du_group.c | 2 ++ drivers/gpu/drm/rcar-du/rcar_du_plane.c | 22 ++++++++++++++++++++-- drivers/gpu/drm/rcar-du/rcar_du_plane.h | 1 + 4 files changed, 31 insertions(+), 4 deletions(-)