drm/i915: refactor i915 plane code into separate file.

Ville suggested this as a good idea, let's move this before moving
the crtc code.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[Jani: fixed i915xx_plane.h standalone build.]
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201221110957.18215-1-jani.nikula@intel.com

drivers/gpu/drm/i915/Makefile

@@ -215,7 +215,8 @@ i915-y += \
 	display/intel_quirks.o \
 	display/intel_sprite.o \
 	display/intel_tc.o \
-	display/intel_vga.o
+	display/intel_vga.o \
+	display/i9xx_plane.o
 i915-$(CONFIG_ACPI) += \
 	display/intel_acpi.o \
 	display/intel_opregion.o

drivers/gpu/drm/i915/display/i9xx_plane.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef _I9XX_PLANE_H_
+#define _I9XX_PLANE_H_
+
+#include <linux/types.h>
+
+enum pipe;
+struct drm_i915_private;
+struct intel_plane;
+struct intel_plane_state;
+
+unsigned int i9xx_plane_max_stride(struct intel_plane *plane,
+				   u32 pixel_format, u64 modifier,
+				   unsigned int rotation);
+int i9xx_check_plane_surface(struct intel_plane_state *plane_state);
+
+struct intel_plane *
+intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe);
+
+#endif

drivers/gpu/drm/i915/display/intel_display.h

@@ -630,11 +630,7 @@ u32 skl_plane_ctl_crtc(const struct intel_crtc_state *crtc_state);
 u32 skl_plane_stride(const struct intel_plane_state *plane_state,
 		     int plane);
 int skl_check_plane_surface(struct intel_plane_state *plane_state);
-int i9xx_check_plane_surface(struct intel_plane_state *plane_state);
 int skl_format_to_fourcc(int format, bool rgb_order, bool alpha);
-unsigned int i9xx_plane_max_stride(struct intel_plane *plane,
-				   u32 pixel_format, u64 modifier,
-				   unsigned int rotation);
 int bdw_get_pipemisc_bpp(struct intel_crtc *crtc);
 unsigned int intel_plane_fence_y_offset(const struct intel_plane_state *plane_state);
 

drivers/gpu/drm/i915/display/intel_sprite.c

@@ -49,6 +49,7 @@
 #include "intel_psr.h"
 #include "intel_dsi.h"
 #include "intel_sprite.h"
+#include "i9xx_plane.h"
 
 int intel_usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
 			     int usecs)