[PATCH 02/15] drm/amdgpu: Add connector atomic check

[mikita.lipski at amd.com]

From: Mikita Lipski <mikita.lipski at amd.com>

[why]
Complying with new MST atomic check requirements.
The driver needs to call this function on every
atomic check to reset the VCPI slots if new state
disables
[how]
- Verify that it is a MST connection
- Verify that old crtc state exists
- Verify the new crtc state disables sink
- Release VCPI slots on the port

Cc: Lyude Paul <lyude at redhat.com>
Signed-off-by: Mikita Lipski <mikita.lipski at amd.com>
---
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 16218a202b59..4e1bbf5bbe77 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -252,10 +252,44 @@ static struct drm_encoder *dm_mst_best_encoder(struct drm_connector *connector)
 	return &amdgpu_dm_connector->mst_encoder->base;
 }
 
+static int dm_dp_mst_atomic_check(struct drm_connector *connector,
+				struct drm_connector_state *new_conn_state)
+{
+	struct drm_atomic_state *state = new_conn_state->state;
+	struct drm_connector_state *old_conn_state =
+			drm_atomic_get_old_connector_state(state, connector);
+	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct drm_crtc_state *new_crtc_state;
+	struct drm_dp_mst_topology_mgr *mst_mgr;
+	struct drm_dp_mst_port *mst_port;
+
+	if (!aconnector || !aconnector->port)
+		return 0;
+
+	mst_port = aconnector->port;
+	mst_mgr = &aconnector->mst_port->mst_mgr;
+
+	if (!old_conn_state->crtc)
+		return 0;
+
+	if (new_conn_state->crtc) {
+		new_crtc_state = drm_atomic_get_old_crtc_state(state, new_conn_state->crtc);
+		if (!new_crtc_state ||
+		    !drm_atomic_crtc_needs_modeset(new_crtc_state) ||
+		    new_crtc_state->enable)
+			return 0;
+		}
+
+	return drm_dp_atomic_release_vcpi_slots(state,
+						mst_mgr,
+						mst_port);
+}
+
 static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
 	.get_modes = dm_dp_mst_get_modes,
 	.mode_valid = amdgpu_dm_connector_mode_valid,
 	.best_encoder = dm_mst_best_encoder,
+	.atomic_check = dm_dp_mst_atomic_check,
 };
 
 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
-- 
2.17.1