drm/i915: extract intel_crt.h from intel_drv.h

It used to be handy that we only had a couple of headers, but over time
intel_drv.h has become unwieldy. Extract declarations to a separate
header file corresponding to the implementation module, clarifying the
modularity of the driver.

Ensure the new header is self-contained, and do so with minimal further
includes, using forward declarations as needed. Include the new header
only where needed, and sort the modified include directives while at it
and as needed.

No functional changes.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/19c39bfcfb82f50c77382e8dea4fe1ad6cd043ed.1554461791.git.jani.nikula@intel.com

drivers/gpu/drm/i915/Makefile.header-test

@@ -10,6 +10,7 @@ header_test := \
 	i915_timeline_types.h \
 	intel_audio.h \
 	intel_context_types.h \
+	intel_crt.h \
 	intel_engine_types.h \
 	intel_frontbuffer.h \
 	intel_workarounds_types.h

drivers/gpu/drm/i915/intel_crt.c

@@ -27,13 +27,16 @@
 #include <linux/dmi.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_probe_helper.h>
-#include "intel_drv.h"
 #include <drm/i915_drm.h>
+
 #include "i915_drv.h"
+#include "intel_crt.h"
+#include "intel_drv.h"
 
 /* Here's the desired hotplug mode */
 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |		\

drivers/gpu/drm/i915/intel_crt.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __INTEL_CRT_H__
+#define __INTEL_CRT_H__
+
+#include "i915_reg.h"
+
+enum pipe;
+struct drm_encoder;
+struct drm_i915_private;
+struct drm_i915_private;
+
+bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
+			    i915_reg_t adpa_reg, enum pipe *pipe);
+void intel_crt_init(struct drm_i915_private *dev_priv);
+void intel_crt_reset(struct drm_encoder *encoder);
+
+#endif /* __INTEL_CRT_H__ */

drivers/gpu/drm/i915/intel_display.c

@@ -46,20 +46,13 @@
 
 #include "i915_drv.h"
 #include "i915_gem_clflush.h"
+#include "i915_reset.h"
 #include "i915_trace.h"
+#include "intel_crt.h"
 #include "intel_drv.h"
 #include "intel_dsi.h"
 #include "intel_frontbuffer.h"
 
-#include "intel_drv.h"
-#include "intel_dsi.h"
-#include "intel_frontbuffer.h"
-
-#include "i915_drv.h"
-#include "i915_gem_clflush.h"
-#include "i915_reset.h"
-#include "i915_trace.h"
-
 /* Primary plane formats for gen <= 3 */
 static const u32 i8xx_primary_formats[] = {
 	DRM_FORMAT_C8,

drivers/gpu/drm/i915/intel_drv.h

@@ -1627,12 +1627,6 @@ void gen9_reset_guc_interrupts(struct drm_i915_private *dev_priv);
 void gen9_enable_guc_interrupts(struct drm_i915_private *dev_priv);
 void gen9_disable_guc_interrupts(struct drm_i915_private *dev_priv);
 
-/* intel_crt.c */
-bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
-			    i915_reg_t adpa_reg, enum pipe *pipe);
-void intel_crt_init(struct drm_i915_private *dev_priv);
-void intel_crt_reset(struct drm_encoder *encoder);
-
 /* intel_ddi.c */
 void intel_ddi_fdi_post_disable(struct intel_encoder *intel_encoder,
 				const struct intel_crtc_state *old_crtc_state,

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -32,6 +32,7 @@
 #include <drm/drm_print.h>
 
 #include "i915_drv.h"
+#include "intel_crt.h"
 #include "intel_drv.h"
 
 /**