drm/amd/display: Create a file dedicated for CRTC

[Why]
The amdgpu_dm file contains most of the code that works as an interface
between DRM API and DC. As a result, this file becomes very large since
it comprises multiple abstractions such as CRTC manipulation.

[How]
This commit extracts the CRTC code to its specific file named
amdgpu_dm_crtc. This change does not change anything inside the
functions; the only exception is converting some static functions to a
global function.

v2: fix ifdef merge mix up (Alex)
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/Makefile

@@ -28,6 +28,7 @@
 AMDGPUDM = \
 	amdgpu_dm.o \
 	amdgpu_dm_plane.o \
+	amdgpu_dm_crtc.o \
 	amdgpu_dm_irq.o \
 	amdgpu_dm_mst_types.o \
 	amdgpu_dm_color.o

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright 2022 Advanced Micro Devices, 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.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __AMDGPU_DM_CRTC_H__
+#define __AMDGPU_DM_CRTC_H__
+
+void dm_crtc_handle_vblank(struct amdgpu_crtc *acrtc);
+
+bool modeset_required(struct drm_crtc_state *crtc_state,
+		      struct dc_stream_state *new_stream,
+		      struct dc_stream_state *old_stream);
+
+int dm_set_vupdate_irq(struct drm_crtc *crtc, bool enable);
+
+bool amdgpu_dm_vrr_active_irq(struct amdgpu_crtc *acrtc);
+
+bool amdgpu_dm_vrr_active(struct dm_crtc_state *dm_state);
+
+int dm_enable_vblank(struct drm_crtc *crtc);
+
+void dm_disable_vblank(struct drm_crtc *crtc);
+
+int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
+			struct drm_plane *plane,
+			uint32_t link_index);
+
+#endif
+