[PATCH v2 08/11] drm/dp_mst: Factor out drm_dp_mst_port_is_logical()

[Imre Deak]

Factor out a function to check if an MST port is logical, used by a
follow-up i915 patch in the patchset.

v2: Move drm_dp_mst_aux_for_parent() forward declaration to the next
    patch. (Ankit)

Cc: Lyude Paul <ly...@redhat.com>
Cc: dri-de...@lists.freedesktop.org
Reviewed-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
Acked-by: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
 drivers/gpu/drm/display/drm_dp_mst_topology.c | 6 +++---
 include/drm/display/drm_dp_mst_helper.h       | 6 ++++++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c 
b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index c193be3577f7a..46b99d5fe0086 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -2274,7 +2274,7 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch 
*mstb,
 
        if (port->pdt != DP_PEER_DEVICE_NONE &&
            drm_dp_mst_is_end_device(port->pdt, port->mcs) &&
-           port->port_num >= DP_MST_LOGICAL_PORT_0)
+           drm_dp_mst_port_is_logical(port))
                port->cached_edid = drm_edid_read_ddc(port->connector,
                                                      &port->aux.ddc);
 
@@ -4219,7 +4219,7 @@ drm_dp_mst_detect_port(struct drm_connector *connector,
        case DP_PEER_DEVICE_SST_SINK:
                ret = connector_status_connected;
                /* for logical ports - cache the EDID */
-               if (port->port_num >= DP_MST_LOGICAL_PORT_0 && 
!port->cached_edid)
+               if (drm_dp_mst_port_is_logical(port) && !port->cached_edid)
                        port->cached_edid = drm_edid_read_ddc(connector, 
&port->aux.ddc);
                break;
        case DP_PEER_DEVICE_DP_LEGACY_CONV:
@@ -5983,7 +5983,7 @@ static bool drm_dp_mst_is_virtual_dpcd(struct 
drm_dp_mst_port *port)
                return false;
 
        /* Virtual DP Sink (Internal Display Panel) */
-       if (port->port_num >= 8)
+       if (drm_dp_mst_port_is_logical(port))
                return true;
 
        /* DP-to-HDMI Protocol Converter */
diff --git a/include/drm/display/drm_dp_mst_helper.h 
b/include/drm/display/drm_dp_mst_helper.h
index cbcb49cb6a460..f00e32b0315d7 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -948,6 +948,12 @@ int __must_check drm_dp_mst_root_conn_atomic_check(struct 
drm_connector_state *n
 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
 
+static inline
+bool drm_dp_mst_port_is_logical(struct drm_dp_mst_port *port)
+{
+       return port->port_num >= DP_MST_LOGICAL_PORT_0;
+}
+
 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
 
 static inline struct drm_dp_mst_topology_state *
-- 
2.43.3