drm/i915/display: include media/cec-notifier.h and linux/debugfs.h where needed

Use a forward declaration for struct cec_notifier instead of including
media/cec-notifier.h in intel_display_types.h, and only include it where
needed.

Also realize that a lot of places depend on including linux/debugfs.h
via intel_display_types.h -> media/cec-notifier.h -> media/cec.h, and
include that too where needed.

v2: hsw_ips.c also needs debugfs.h (kernel test robot)

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240827104521.4151471-1-jani.nikula@intel.com

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

@@ -3,6 +3,8 @@
  * Copyright © 2022 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+
 #include "hsw_ips.h"
 #include "i915_drv.h"
 #include "i915_reg.h"

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

@@ -3,6 +3,8 @@
  * Copyright 2024, Intel Corporation.
  */
 
+#include <linux/debugfs.h>
+
 #include "intel_alpm.h"
 #include "intel_crtc.h"
 #include "intel_de.h"

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

@@ -25,6 +25,7 @@
  *
  */
 
+#include <linux/debugfs.h>
 #include <linux/firmware.h>
 
 #include <drm/display/drm_dp_helper.h>

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

@@ -21,6 +21,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <linux/debugfs.h>
 #include <linux/time.h>
 
 #include <drm/drm_fixed.h>

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

@@ -3,6 +3,7 @@
  * Copyright © 2020 Intel Corporation
  */
 
+#include <linux/debugfs.h>
 #include <linux/string_helpers.h>
 
 #include <drm/drm_debugfs.h>

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

@@ -43,7 +43,6 @@
 #include <drm/drm_rect.h>
 #include <drm/drm_vblank_work.h>
 #include <drm/intel/i915_hdcp_interface.h>
-#include <media/cec-notifier.h>
 
 #include "gem/i915_gem_object_types.h" /* for to_intel_bo() */
 #include "i915_vma.h"
@@ -55,6 +54,7 @@
 #include "intel_dpll_mgr.h"
 #include "intel_wm_types.h"
 
+struct cec_notifier;
 struct drm_printer;
 struct __intel_global_objs_state;
 struct intel_connector;

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

@@ -21,6 +21,8 @@
  * IN THE SOFTWARE.
  */
 
+#include <linux/debugfs.h>
+
 #include <drm/display/drm_dp_helper.h>
 
 #include "i915_drv.h"

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

@@ -3,6 +3,8 @@
  * Copyright © 2021 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+
 #include "i915_drv.h"
 #include "i915_reg.h"
 #include "intel_atomic.h"

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

@@ -38,6 +38,7 @@
  * forcibly disable it to allow proper screen updates.
  */
 
+#include <linux/debugfs.h>
 #include <linux/string_helpers.h>
 
 #include <drm/drm_blend.h>

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

@@ -41,6 +41,8 @@
 #include <drm/drm_probe_helper.h>
 #include <drm/intel/intel_lpe_audio.h>
 
+#include <media/cec-notifier.h>
+
 #include "g4x_hdmi.h"
 #include "i915_drv.h"
 #include "i915_reg.h"

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

@@ -21,6 +21,7 @@
  * IN THE SOFTWARE.
  */
 
+#include <linux/debugfs.h>
 #include <linux/kernel.h>
 
 #include <drm/drm_probe_helper.h>

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

@@ -26,6 +26,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/debugfs.h>
 #include <linux/dmi.h>
 #include <acpi/video.h>
 

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

@@ -3,6 +3,8 @@
  * Copyright © 2020 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+
 #include "g4x_dp.h"
 #include "i915_drv.h"
 #include "i915_reg.h"

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

@@ -21,6 +21,8 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <linux/debugfs.h>
+
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_debugfs.h>

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

@@ -3,6 +3,8 @@
  * Copyright © 2023 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+
 #include "i915_drv.h"
 #include "i9xx_wm.h"
 #include "intel_display_types.h"

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

@@ -3,6 +3,8 @@
  * Copyright © 2022 Intel Corporation
  */
 
+#include <linux/debugfs.h>
+
 #include <drm/drm_blend.h>
 
 #include "i915_drv.h"