[PATCH 01/10] drm/dp_mst: add a function to retrieve vcpi slots

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

radeon requires this to get the slots for later filling
out a table on every transition.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 13 +++++++++++++
 include/drm/drm_dp_mst_helper.h       |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 9a5b687..0d15e6e 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2319,6 +2319,19 @@ out:
 }
 EXPORT_SYMBOL(drm_dp_mst_allocate_vcpi);
 
+int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port)
+{
+	int slots = 0;
+	port = drm_dp_get_validated_port_ref(mgr, port);
+	if (!port)
+		return slots;
+
+	slots = port->vcpi.num_slots;
+	drm_dp_put_port(port);
+	return slots;
+}
+EXPORT_SYMBOL(drm_dp_mst_get_vcpi_slots);
+
 /**
  * drm_dp_mst_reset_vcpi_slots() - Reset number of slots to 0 for VCPI
  * @mgr: manager for this port
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 00c1da9..a250781 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -486,6 +486,8 @@ int drm_dp_calc_pbn_mode(int clock, int bpp);
 
 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
 
+int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
+
 
 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 
-- 
2.1.0