drm/amd/display: Support crc on specific region

[Why]
To support feature that calculates CRTC CRC value on specific
region (crc window).

[How]
1. Use debugfs to specify crtc crc window
2. Use vline0 IRQ to write crtc crc window

Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Kconfig

@@ -38,4 +38,18 @@ config DEBUG_KERNEL_DC
 	help
 	  Choose this option if you want to hit kdgb_break in assert.
 
+config DRM_AMD_SECURE_DISPLAY
+        bool "Enable secure display support"
+        default n
+        depends on DEBUG_FS
+        depends on DRM_AMD_DC_DCN
+        help
+            Choose this option if you want to
+            support secure display
+
+            This option enables the calculation
+            of crc of specific region via debugfs.
+            Cooperate with specific DMCU FW.
+
+
 endmenu