drm/i915: extract intel_ddi.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/61d159117475a48a5db7bd7d652c198d4fa08d7b.1554461791.git.jani.nikula@intel.com

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

@@ -11,6 +11,7 @@ header_test := \
 	intel_audio.h \
 	intel_context_types.h \
 	intel_crt.h \
+	intel_ddi.h \
 	intel_engine_types.h \
 	intel_frontbuffer.h \
 	intel_workarounds_types.h

drivers/gpu/drm/i915/icl_dsi.c

@@ -25,8 +25,10 @@
  *   Jani Nikula <jani.nikula@intel.com>
  */
 
-#include <drm/drm_mipi_dsi.h>
 #include <drm/drm_atomic_helper.h>
+#include <drm/drm_mipi_dsi.h>
+
+#include "intel_ddi.h"
 #include "intel_dsi.h"
 
 static inline int header_credits_available(struct drm_i915_private *dev_priv,

drivers/gpu/drm/i915/intel_crt.c

@@ -36,6 +36,7 @@
 
 #include "i915_drv.h"
 #include "intel_crt.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 
 /* Here's the desired hotplug mode */

drivers/gpu/drm/i915/intel_ddi.c

@@ -29,6 +29,7 @@
 
 #include "i915_drv.h"
 #include "intel_audio.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 #include "intel_dsi.h"
 

drivers/gpu/drm/i915/intel_ddi.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __INTEL_DDI_H__
+#define __INTEL_DDI_H__
+
+#include <drm/i915_drm.h>
+
+#include "intel_display.h"
+
+struct drm_connector_state;
+struct drm_i915_private;
+struct intel_connector;
+struct intel_crtc;
+struct intel_crtc_state;
+struct intel_dp;
+struct intel_dpll_hw_state;
+struct intel_encoder;
+
+void intel_ddi_fdi_post_disable(struct intel_encoder *intel_encoder,
+				const struct intel_crtc_state *old_crtc_state,
+				const struct drm_connector_state *old_conn_state);
+void hsw_fdi_link_train(struct intel_crtc *crtc,
+			const struct intel_crtc_state *crtc_state);
+void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port);
+bool intel_ddi_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe);
+void intel_ddi_enable_transcoder_func(const struct intel_crtc_state *crtc_state);
+void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state);
+void intel_ddi_enable_pipe_clock(const struct intel_crtc_state *crtc_state);
+void intel_ddi_disable_pipe_clock(const  struct intel_crtc_state *crtc_state);
+void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state);
+void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp);
+bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector);
+void intel_ddi_get_config(struct intel_encoder *encoder,
+			  struct intel_crtc_state *pipe_config);
+void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
+				    bool state);
+void intel_ddi_compute_min_voltage_level(struct drm_i915_private *dev_priv,
+					 struct intel_crtc_state *crtc_state);
+u32 bxt_signal_levels(struct intel_dp *intel_dp);
+u32 ddi_signal_levels(struct intel_dp *intel_dp);
+u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);
+u8 intel_ddi_dp_pre_emphasis_max(struct intel_encoder *encoder,
+				 u8 voltage_swing);
+int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
+				     bool enable);
+void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder);
+int cnl_calc_wrpll_link(struct drm_i915_private *dev_priv,
+			struct intel_dpll_hw_state *state);
+
+#endif /* __INTEL_DDI_H__ */

drivers/gpu/drm/i915/intel_display.c

@@ -49,6 +49,7 @@
 #include "i915_reset.h"
 #include "i915_trace.h"
 #include "intel_crt.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 #include "intel_dsi.h"
 #include "intel_frontbuffer.h"

drivers/gpu/drm/i915/intel_dp.c

@@ -43,6 +43,7 @@
 
 #include "i915_drv.h"
 #include "intel_audio.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 
 #define DP_DPRX_ESI_LEN 14

drivers/gpu/drm/i915/intel_dp_mst.c

@@ -29,6 +29,7 @@
 
 #include "i915_drv.h"
 #include "intel_audio.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 
 static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,

drivers/gpu/drm/i915/intel_drv.h

@@ -1627,42 +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_ddi.c */
-void intel_ddi_fdi_post_disable(struct intel_encoder *intel_encoder,
-				const struct intel_crtc_state *old_crtc_state,
-				const struct drm_connector_state *old_conn_state);
-void hsw_fdi_link_train(struct intel_crtc *crtc,
-			const struct intel_crtc_state *crtc_state);
-void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port);
-bool intel_ddi_get_hw_state(struct intel_encoder *encoder, enum pipe *pipe);
-void intel_ddi_enable_transcoder_func(const struct intel_crtc_state *crtc_state);
-void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state);
-void intel_ddi_enable_pipe_clock(const struct intel_crtc_state *crtc_state);
-void intel_ddi_disable_pipe_clock(const  struct intel_crtc_state *crtc_state);
-void intel_ddi_set_pipe_settings(const struct intel_crtc_state *crtc_state);
-void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp);
-bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector);
-void intel_ddi_get_config(struct intel_encoder *encoder,
-			  struct intel_crtc_state *pipe_config);
-
-void intel_ddi_set_vc_payload_alloc(const struct intel_crtc_state *crtc_state,
-				    bool state);
-void intel_ddi_compute_min_voltage_level(struct drm_i915_private *dev_priv,
-					 struct intel_crtc_state *crtc_state);
-u32 bxt_signal_levels(struct intel_dp *intel_dp);
-u32 ddi_signal_levels(struct intel_dp *intel_dp);
-u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder);
-u8 intel_ddi_dp_pre_emphasis_max(struct intel_encoder *encoder,
-				 u8 voltage_swing);
-int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
-				     bool enable);
-void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder);
-int cnl_calc_wrpll_link(struct drm_i915_private *dev_priv,
-			struct intel_dpll_hw_state *state);
-
-unsigned int intel_fb_align_height(const struct drm_framebuffer *fb,
-				   int color_plane, unsigned int height);
-
 /* intel_cdclk.c */
 int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state);
 void skl_init_cdclk(struct drm_i915_private *dev_priv);
@@ -1713,6 +1677,8 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv);
 unsigned int intel_fb_xy_to_linear(int x, int y,
 				   const struct intel_plane_state *state,
 				   int plane);
+unsigned int intel_fb_align_height(const struct drm_framebuffer *fb,
+				   int color_plane, unsigned int height);
 void intel_add_fb_offsets(int *x, int *y,
 			  const struct intel_plane_state *state, int plane);
 unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info);

drivers/gpu/drm/i915/intel_hdmi.c

@@ -41,6 +41,7 @@
 
 #include "i915_drv.h"
 #include "intel_audio.h"
+#include "intel_ddi.h"
 #include "intel_drv.h"
 
 static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)