drm/nouveau/disp: add connector class

Will be used to provide more solid driver interfaces in general, but
the immediate motivation is work towards fixing issues with handling
hotplug/DP IRQ events.

Its use is currently limited to where we support non-polled hotplug
already (ie. any GPU since NV40ish era, where our DCB handling works
well enough), until that gets cleaned up someday.

v2:
- use ?: (lyude)

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 55 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nvif/Kbuild b/drivers/gpu/drm/nouveau/nvif/Kbuild
index f194d354c1f5..576237f47d8d 100644
--- a/drivers/gpu/drm/nouveau/nvif/Kbuild
+++ b/drivers/gpu/drm/nouveau/nvif/Kbuild
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: MIT
 nvif-y := nvif/object.o
 nvif-y += nvif/client.o
+nvif-y += nvif/conn.o
 nvif-y += nvif/device.o
 nvif-y += nvif/disp.o
 nvif-y += nvif/driver.o
diff --git a/drivers/gpu/drm/nouveau/nvif/conn.c b/drivers/gpu/drm/nouveau/nvif/conn.c
new file mode 100644
index 000000000000..a83b8a4a57e6
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/conn.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2021 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include <nvif/conn.h>
+#include <nvif/disp.h>
+#include <nvif/printf.h>
+
+#include <nvif/class.h>
+#include <nvif/if0011.h>
+
+void
+nvif_conn_dtor(struct nvif_conn *conn)
+{
+	nvif_object_dtor(&conn->object);
+}
+
+int
+nvif_conn_ctor(struct nvif_disp *disp, const char *name, int id, struct nvif_conn *conn)
+{
+	struct nvif_conn_v0 args;
+	int ret;
+
+	args.version = 0;
+	args.id = id;
+
+	ret = nvif_object_ctor(&disp->object, name ?: "nvifConn", id, NVIF_CLASS_CONN,
+			       &args, sizeof(args), &conn->object);
+	NVIF_ERRON(ret, &disp->object, "[NEW conn id:%d]", id);
+	return ret;
+}
diff --git a/drivers/gpu/drm/nouveau/nvif/disp.c b/drivers/gpu/drm/nouveau/nvif/disp.c
index 3a6b7ffeb97a..b8e98070c77e 100644
--- a/drivers/gpu/drm/nouveau/nvif/disp.c
+++ b/drivers/gpu/drm/nouveau/nvif/disp.c
@@ -69,5 +69,10 @@ nvif_disp_ctor(struct nvif_device *device, const char *name, s32 oclass, struct
 	ret = nvif_object_ctor(&device->object, name ?: "nvifDisp", 0,
 			       disps[cid].oclass, &args, sizeof(args), &disp->object);
 	NVIF_ERRON(ret, &device->object, "[NEW disp%04x]", disps[cid].oclass);
-	return ret;
+	if (ret)
+		return ret;
+
+	NVIF_DEBUG(&disp->object, "[NEW] conn_mask:%08x", args.conn_mask);
+	disp->conn_mask = args.conn_mask;
+	return 0;
 }