From: Mikita Lipski <mikita.lipski@xxxxxxx>
[why]
Whenever a connector on an MST network is changed or
undergoes a modeset, the DSC configs for each stream on that
topology will be recalculated. This can change their required
bandwidth, requiring a full reprogramming, as though a modeset
was performed, even if that stream did not change timing.
[how]
Adding helper to trigger modesets on MST DSC connectors
by setting mode_changed flag on CRTCs in the same topology
as affected connector
v2: use drm_dp_mst_dsc_aux_for_port function to verify
if the port is DSC capable
v3: - added _must_check attribute
- removed topology manager check
- fix typos and indentations
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Signed-off-by: Mikita Lipski <mikita.lipski@xxxxxxx>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 61 +++++++++++++++++++++++++++
include/drm/drm_dp_mst_helper.h | 3 ++
2 files changed, 64 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index ce21662f6144..ec90323949fc 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -4775,6 +4775,67 @@ drm_dp_mst_atomic_check_vcpi_alloc_limit(struct drm_dp_mst_topology_mgr *mgr,
return 0;
}
+/**
+ * drm_dp_mst_add_affected_dsc_crtcs
+ * @state: Pointer to the new struct drm_dp_mst_topology_state
+ * @port: Port pointer of connector with new state
+ *
+ * Whenever there is a change in mst topology
+ * DSC configuration would have to be recalculated
+ * therefore we need to trigger modeset on all affected
+ * CRTCs in that topology
+ *
+ * See also:
+ * drm_dp_mst_atomic_enable_dsc()
+ */
+int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm_dp_mst_topology_mgr *mgr)
+{
+ struct drm_dp_mst_topology_state *mst_state;
+ struct drm_dp_vcpi_allocation *pos;
+ struct drm_connector *connector;
+ struct drm_connector_state *conn_state;
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+
+ mst_state = drm_atomic_get_mst_topology_state(state, mgr);
+
+ if (IS_ERR(mst_state))
+ return -EINVAL;
+
+ list_for_each_entry(pos, &mst_state->vcpis, next) {
+
+ connector = pos->port->connector;
+
+ if (!connector)
+ return -EINVAL;
+
+ conn_state = drm_atomic_get_connector_state(state, connector);
+
+ if (IS_ERR(conn_state))
+ return PTR_ERR(conn_state);
+
+ crtc = conn_state->crtc;
+
+ if (WARN_ON(!crtc))
+ return -EINVAL;
+
+ if (!drm_dp_mst_dsc_aux_for_port(pos->port))
+ continue;
+
+ crtc_state = drm_atomic_get_crtc_state(mst_state->base.state, crtc);
+
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+
+ DRM_DEBUG_ATOMIC("[MST MGR:%p] Setting mode_changed flag on CRTC %p\n",
+ mgr, crtc);
+
+ crtc_state->mode_changed = true;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_dp_mst_add_affected_dsc_crtcs);
+
/**
* drm_dp_mst_atomic_enable_dsc - Set DSC Enable Flag to On/Off
* @state: Pointer to the new drm_atomic_state
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 2919d9776af3..942575de86a0 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -780,6 +780,9 @@ int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
int pbn, int pbn_div,
bool enable);
int __must_check
+drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,
+ struct drm_dp_mst_topology_mgr *mgr);
+int __must_check
drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port);
--
2.17.1
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