drm/amd/display: Add DP 2.0 MST DM Support

[Why]
Add DP2 MST and debugfs support

[How]
Update the slot info based on the link encoding format

Reviewed-by: "Lin, Wayne" <Wayne.Lin@amd.com>
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025223825.301703-5-lyude@redhat.com

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f35561b..ecdeeed 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -10684,6 +10684,8 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 #if defined(CONFIG_DRM_AMD_DC_DCN)
        struct dsc_mst_fairness_vars vars[MAX_PIPES];
 #endif
+       struct drm_dp_mst_topology_state *mst_state;
+       struct drm_dp_mst_topology_mgr *mgr;
 
        trace_amdgpu_dm_atomic_check_begin(state);
 
@@ -10891,6 +10893,33 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
                lock_and_validation_needed = true;
        }
 
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+       /* set the slot info for each mst_state based on the link encoding format */
+       for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
+               struct amdgpu_dm_connector *aconnector;
+               struct drm_connector *connector;
+               struct drm_connector_list_iter iter;
+               u8 link_coding_cap;
+
+               if (!mgr->mst_state )
+                       continue;
+
+               drm_connector_list_iter_begin(dev, &iter);
+               drm_for_each_connector_iter(connector, &iter) {
+                       int id = connector->index;
+
+                       if (id == mst_state->mgr->conn_base_id) {
+                               aconnector = to_amdgpu_dm_connector(connector);
+                               link_coding_cap = dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);
+                               drm_dp_mst_update_slots(mst_state, link_coding_cap);
+
+                               break;
+                       }
+               }
+               drm_connector_list_iter_end(&iter);
+
+       }
+#endif
        /**
         * Streams and planes are reset when there are changes that affect
         * bandwidth. Anything that affects bandwidth needs to go through

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 814f67d..3d44896 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -294,6 +294,9 @@ static ssize_t dp_link_settings_write(struct file *f, const char __user *buf,
        case LINK_RATE_RBR2:
        case LINK_RATE_HIGH2:
        case LINK_RATE_HIGH3:
+#if defined(CONFIG_DRM_AMD_DC_DCN)
+       case LINK_RATE_UHBR10:
+#endif
                break;
        default:
                valid_input = false;

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 6169488..53b5cc7 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -219,6 +219,7 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
        struct drm_dp_mst_topology_mgr *mst_mgr;
        struct drm_dp_mst_port *mst_port;
        bool ret;
+       u8 link_coding_cap;
 
        aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
        /* Accessing the connector state is required for vcpi_slots allocation
@@ -238,6 +239,8 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
 
        mst_port = aconnector->port;
 
+       link_coding_cap = dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);
+
        if (enable) {
 
                ret = drm_dp_mst_allocate_vcpi(mst_mgr, mst_port,
@@ -251,7 +254,7 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
        }
 
        /* It's OK for this to fail */
-       drm_dp_update_payload_part1(mst_mgr, 1);
+       drm_dp_update_payload_part1(mst_mgr, (link_coding_cap == DP_CAP_ANSI_128B132B) ? 0:1);
 
        /* mst_mgr->->payloads are VC payload notify MST branch using DPCD or
         * AUX message. The sequence is slot 1-63 allocated sequence for each