drm/i915/debugfs: Move out pipe CRC code

In preparation to using a generic API in the DRM core for continuous CRC
generation, move the related code out of i915_debugfs.c into a new file.

Eventually, only the Intel-specific code will remain in this new file.

v2: Rebased.

v6: Rebased.

v7: Fix whitespace issue.

v9: Have intel_display_crc_init accept a drm_i915_private instead.

v12: Rebased.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1481545788-18194-1-git-send-email-tomeu.vizoso@collabora.com

drivers/gpu/drm/i915/Makefile

@@ -24,7 +24,7 @@ i915-y := i915_drv.o \
 	  intel_runtime_pm.o
 
 i915-$(CONFIG_COMPAT)   += i915_ioc32.o
-i915-$(CONFIG_DEBUG_FS) += i915_debugfs.o
+i915-$(CONFIG_DEBUG_FS) += i915_debugfs.o intel_pipe_crc.o
 
 # GEM code
 i915-y += i915_cmd_parser.o \

drivers/gpu/drm/i915/intel_drv.h

@@ -1855,4 +1855,9 @@ void intel_color_load_luts(struct drm_crtc_state *crtc_state);
 bool lspcon_init(struct intel_digital_port *intel_dig_port);
 void lspcon_resume(struct intel_lspcon *lspcon);
 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon);
+
+/* intel_pipe_crc.c */
+int intel_pipe_crc_create(struct drm_minor *minor);
+void intel_pipe_crc_cleanup(struct drm_minor *minor);
+extern const struct file_operations i915_display_crc_ctl_fops;
 #endif /* __INTEL_DRV_H__ */