drm/radeon/kms: add some dp encoder/connector helper funcs

Used for dp1.2 support and for dp bridges.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 99 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index a7bdcc7553ad..9f3c6509d9d0 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1068,6 +1068,77 @@ static int radeon_dp_get_modes(struct drm_connector *connector)
         return ret;
 }
 
+bool radeon_connector_encoder_is_dp_bridge(struct drm_connector *connector)
+{
+        struct drm_mode_object *obj;
+        struct drm_encoder *encoder;
+        struct radeon_encoder *radeon_encoder;
+        int i;
+        bool found = false;
+
+        for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
+                if (connector->encoder_ids[i] == 0)
+                        break;
+
+                obj = drm_mode_object_find(connector->dev, connector->encoder_ids[i], DRM_MODE_OBJECT_ENCODER);
+                if (!obj)
+                        continue;
+
+                encoder = obj_to_encoder(obj);
+                radeon_encoder = to_radeon_encoder(encoder);
+
+                switch (radeon_encoder->encoder_id) {
+                case ENCODER_OBJECT_ID_TRAVIS:
+                case ENCODER_OBJECT_ID_NUTMEG:
+                        found = true;
+                        break;
+                default:
+                        break;
+                }
+        }
+
+        return found;
+}
+
+bool radeon_connector_encoder_is_hbr2(struct drm_connector *connector)
+{
+        struct drm_mode_object *obj;
+        struct drm_encoder *encoder;
+        struct radeon_encoder *radeon_encoder;
+        int i;
+        bool found = false;
+
+        for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
+                if (connector->encoder_ids[i] == 0)
+                        break;
+
+                obj = drm_mode_object_find(connector->dev, connector->encoder_ids[i], DRM_MODE_OBJECT_ENCODER);
+                if (!obj)
+                        continue;
+
+                encoder = obj_to_encoder(obj);
+                radeon_encoder = to_radeon_encoder(encoder);
+                if (radeon_encoder->caps & ATOM_ENCODER_CAP_RECORD_HBR2)
+                        found = true;
+        }
+
+        return found;
+}
+
+bool radeon_connector_is_dp12_capable(struct drm_connector *connector)
+{
+        struct drm_device *dev = connector->dev;
+        struct radeon_device *rdev = dev->dev_private;
+
+        if (ASIC_IS_DCE5(rdev) &&
+            (rdev->clock.dp_extclk >= 53900) &&
+            radeon_connector_encoder_is_hbr2(connector)) {
+                return true;
+        }
+
+        return false;
+}
+
 static enum drm_connector_status
 radeon_dp_detect(struct drm_connector *connector, bool force)
 {
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index fd0087faf758..1c064e78f21a 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -250,6 +250,25 @@ struct drm_encoder *radeon_atom_get_external_encoder(struct drm_encoder *encoder
         return NULL;
 }
 
+bool radeon_encoder_is_dp_bridge(struct drm_encoder *encoder)
+{
+        struct drm_encoder *other_encoder = radeon_atom_get_external_encoder(encoder);
+
+        if (other_encoder) {
+                struct radeon_encoder *radeon_encoder = to_radeon_encoder(other_encoder);
+
+                switch (radeon_encoder->encoder_id) {
+                case ENCODER_OBJECT_ID_TRAVIS:
+                case ENCODER_OBJECT_ID_NUTMEG:
+                        return true;
+                default:
+                        return false;
+                }
+        }
+
+        return false;
+}
+
 void radeon_panel_mode_fixup(struct drm_encoder *encoder,
                              struct drm_display_mode *adjusted_mode)
 {
@@ -621,6 +640,10 @@ atombios_get_encoder_mode(struct drm_encoder *encoder)
         struct radeon_connector *radeon_connector;
         struct radeon_connector_atom_dig *dig_connector;
 
+        /* dp bridges are always DP */
+        if (radeon_encoder_is_dp_bridge(encoder))
+                return ATOM_ENCODER_MODE_DP;
+
         connector = radeon_get_connector_for_encoder(encoder);
         if (!connector) {
                 switch (radeon_encoder->encoder_id) {
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index e4d32373c630..7a3cfa09d45f 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -464,6 +464,11 @@ radeon_atombios_get_tv_info(struct radeon_device *rdev);
 extern struct drm_connector *
 radeon_get_connector_for_encoder(struct drm_encoder *encoder);
 
+extern bool radeon_encoder_is_dp_bridge(struct drm_encoder *encoder);
+extern bool radeon_connector_encoder_is_dp_bridge(struct drm_connector *connector);
+extern bool radeon_connector_encoder_is_hbr2(struct drm_connector *connector);
+extern bool radeon_connector_is_dp12_capable(struct drm_connector *connector);
+
 extern void radeon_connector_hotplug(struct drm_connector *connector);
 extern bool radeon_dp_needs_link_train(struct radeon_connector *radeon_connector);
 extern int radeon_dp_mode_valid_helper(struct radeon_connector *radeon_connector,