drm/i915: extract intel_panel.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: NChris Wilson <chris@chris-wilson.co.uk>
Acked-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c9f02ae09123866bc55269175ab75e844ffbd6ac.1554461791.git.jani.nikula@intel.com

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

@@ -20,6 +20,7 @@ header_test := \
 	intel_frontbuffer.h \
 	intel_hdcp.h \
 	intel_lspcon.h \
+	intel_panel.h \
 	intel_psr.h \
 	intel_sdvo.h \
 	intel_workarounds_types.h

drivers/gpu/drm/i915/icl_dsi.c

@@ -31,6 +31,7 @@
 #include "intel_connector.h"
 #include "intel_ddi.h"
 #include "intel_dsi.h"
+#include "intel_panel.h"
 
 static inline int header_credits_available(struct drm_i915_private *dev_priv,
 					   enum transcoder dsi_trans)

drivers/gpu/drm/i915/intel_connector.c

@@ -33,6 +33,7 @@
 #include "intel_connector.h"
 #include "intel_drv.h"
 #include "intel_hdcp.h"
+#include "intel_panel.h"
 
 int intel_connector_init(struct intel_connector *connector)
 {

drivers/gpu/drm/i915/intel_ddi.c

@@ -35,6 +35,7 @@
 #include "intel_dsi.h"
 #include "intel_hdcp.h"
 #include "intel_lspcon.h"
+#include "intel_panel.h"
 #include "intel_psr.h"
 
 struct ddi_buf_trans {

drivers/gpu/drm/i915/intel_dp.c

@@ -48,6 +48,7 @@
 #include "intel_drv.h"
 #include "intel_hdcp.h"
 #include "intel_lspcon.h"
+#include "intel_panel.h"
 #include "intel_psr.h"
 
 #define DP_DPRX_ESI_LEN 14

drivers/gpu/drm/i915/intel_drv.h

@@ -2054,51 +2054,6 @@ int intel_overlay_attrs_ioctl(struct drm_device *dev, void *data,
 			      struct drm_file *file_priv);
 void intel_overlay_reset(struct drm_i915_private *dev_priv);
 
-
-/* intel_panel.c */
-int intel_panel_init(struct intel_panel *panel,
-		     struct drm_display_mode *fixed_mode,
-		     struct drm_display_mode *downclock_mode);
-void intel_panel_fini(struct intel_panel *panel);
-void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
-			    struct drm_display_mode *adjusted_mode);
-void intel_pch_panel_fitting(struct intel_crtc *crtc,
-			     struct intel_crtc_state *pipe_config,
-			     int fitting_mode);
-void intel_gmch_panel_fitting(struct intel_crtc *crtc,
-			      struct intel_crtc_state *pipe_config,
-			      int fitting_mode);
-void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
-				    u32 level, u32 max);
-int intel_panel_setup_backlight(struct drm_connector *connector,
-				enum pipe pipe);
-void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
-				  const struct drm_connector_state *conn_state);
-void intel_panel_update_backlight(struct intel_encoder *encoder,
-				  const struct intel_crtc_state *crtc_state,
-				  const struct drm_connector_state *conn_state);
-void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state);
-struct drm_display_mode *
-intel_panel_edid_downclock_mode(struct intel_connector *connector,
-				const struct drm_display_mode *fixed_mode);
-struct drm_display_mode *
-intel_panel_edid_fixed_mode(struct intel_connector *connector);
-struct drm_display_mode *
-intel_panel_vbt_fixed_mode(struct intel_connector *connector);
-
-#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
-int intel_backlight_device_register(struct intel_connector *connector);
-void intel_backlight_device_unregister(struct intel_connector *connector);
-#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
-static inline int intel_backlight_device_register(struct intel_connector *connector)
-{
-	return 0;
-}
-static inline void intel_backlight_device_unregister(struct intel_connector *connector)
-{
-}
-#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
-
 /* intel_quirks.c */
 void intel_init_quirks(struct drm_i915_private *dev_priv);
 

drivers/gpu/drm/i915/intel_dvo.c

@@ -36,6 +36,7 @@
 #include "i915_drv.h"
 #include "intel_connector.h"
 #include "intel_drv.h"
+#include "intel_panel.h"
 
 #define SIL164_ADDR	0x38
 #define CH7xxx_ADDR	0x76

drivers/gpu/drm/i915/intel_hdmi.c

@@ -47,6 +47,7 @@
 #include "intel_hdcp.h"
 #include "intel_lspcon.h"
 #include "intel_sdvo.h"
+#include "intel_panel.h"
 
 static struct drm_device *intel_hdmi_to_dev(struct intel_hdmi *intel_hdmi)
 {

drivers/gpu/drm/i915/intel_lvds.c

@@ -42,6 +42,7 @@
 #include "i915_drv.h"
 #include "intel_connector.h"
 #include "intel_drv.h"
+#include "intel_panel.h"
 
 /* Private structure for the integrated LVDS support */
 struct intel_lvds_pps {

drivers/gpu/drm/i915/intel_opregion.c

@@ -32,9 +32,10 @@
 
 #include <drm/i915_drm.h>
 
-#include "intel_opregion.h"
 #include "i915_drv.h"
 #include "intel_drv.h"
+#include "intel_opregion.h"
+#include "intel_panel.h"
 
 #define OPREGION_HEADER_OFFSET 0
 #define OPREGION_ACPI_OFFSET   0x100

drivers/gpu/drm/i915/intel_panel.c

@@ -36,6 +36,7 @@
 
 #include "intel_connector.h"
 #include "intel_drv.h"
+#include "intel_panel.h"
 
 #define CRC_PMIC_PWM_PERIOD_NS	21333
 

drivers/gpu/drm/i915/intel_panel.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __INTEL_PANEL_H__
+#define __INTEL_PANEL_H__
+
+#include <linux/types.h>
+
+#include "intel_display.h"
+
+struct drm_connector;
+struct drm_connector_state;
+struct drm_display_mode;
+struct intel_connector;
+struct intel_crtc;
+struct intel_crtc_state;
+struct intel_encoder;
+struct intel_panel;
+
+int intel_panel_init(struct intel_panel *panel,
+		     struct drm_display_mode *fixed_mode,
+		     struct drm_display_mode *downclock_mode);
+void intel_panel_fini(struct intel_panel *panel);
+void intel_fixed_panel_mode(const struct drm_display_mode *fixed_mode,
+			    struct drm_display_mode *adjusted_mode);
+void intel_pch_panel_fitting(struct intel_crtc *crtc,
+			     struct intel_crtc_state *pipe_config,
+			     int fitting_mode);
+void intel_gmch_panel_fitting(struct intel_crtc *crtc,
+			      struct intel_crtc_state *pipe_config,
+			      int fitting_mode);
+void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state,
+				    u32 level, u32 max);
+int intel_panel_setup_backlight(struct drm_connector *connector,
+				enum pipe pipe);
+void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
+				  const struct drm_connector_state *conn_state);
+void intel_panel_update_backlight(struct intel_encoder *encoder,
+				  const struct intel_crtc_state *crtc_state,
+				  const struct drm_connector_state *conn_state);
+void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state);
+struct drm_display_mode *
+intel_panel_edid_downclock_mode(struct intel_connector *connector,
+				const struct drm_display_mode *fixed_mode);
+struct drm_display_mode *
+intel_panel_edid_fixed_mode(struct intel_connector *connector);
+struct drm_display_mode *
+intel_panel_vbt_fixed_mode(struct intel_connector *connector);
+
+#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
+int intel_backlight_device_register(struct intel_connector *connector);
+void intel_backlight_device_unregister(struct intel_connector *connector);
+#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+static inline int intel_backlight_device_register(struct intel_connector *connector)
+{
+	return 0;
+}
+static inline void intel_backlight_device_unregister(struct intel_connector *connector)
+{
+}
+#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+
+#endif /* __INTEL_PANEL_H__ */

drivers/gpu/drm/i915/intel_sdvo.c

@@ -39,6 +39,7 @@
 #include "i915_drv.h"
 #include "intel_connector.h"
 #include "intel_drv.h"
+#include "intel_panel.h"
 #include "intel_sdvo.h"
 #include "intel_sdvo_regs.h"
 

drivers/gpu/drm/i915/vlv_dsi.c

@@ -36,6 +36,7 @@
 #include "intel_connector.h"
 #include "intel_drv.h"
 #include "intel_dsi.h"
+#include "intel_panel.h"
 
 /* return pixels in terms of txbyteclkhs */
 static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,