rockchip: add pwm-backlight support for DSI panel

Signed-off-by: hmz007 <hmz007@gmail.com>

device/friendlyelec/nanopi3/display_settings.xml

@@ -0,0 +1,12 @@
+<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
+<display-settings>
+<config identifier="0" />
+<display
+  name="local:0"
+  backlightPath="/sys/class/backlight/pwm-backlight/brightness" />
+<display
+  name="local:1"
+  shouldShowSystemDecors="false"
+  shouldShowIme="true"
+  forcedDensity="240" />
+</display-settings>

device/rockchip/common/device.mk

@@ -821,10 +821,10 @@ endif
 PRODUCT_PACKAGES += \
     libbaseparameter
 
-USE_PRODUCT_DISPLAY_SETTINGS := $(shell test -f $(TARGET_DEVICE_DIR)/displays/display_settings.xml && echo true)
+USE_PRODUCT_DISPLAY_SETTINGS := $(shell test -f $(TARGET_DEVICE_DIR)/display_settings.xml && echo true)
 ifeq ($(strip $(USE_PRODUCT_DISPLAY_SETTINGS)), true)
 PRODUCT_COPY_FILES += \
-    $(TARGET_DEVICE_DIR)/displays/display_settings.xml:$(TARGET_COPY_OUT_VENDOR)/etc/display_settings.xml
+    $(TARGET_DEVICE_DIR)/display_settings.xml:$(TARGET_COPY_OUT_VENDOR)/etc/display_settings.xml
 else
 PRODUCT_COPY_FILES += \
     $(LOCAL_PATH)/display_settings.xml:$(TARGET_COPY_OUT_VENDOR)/etc/display_settings.xml

device/rockchip/common/rootdir/init.rk30board.rc

@@ -129,6 +129,7 @@ on boot
     # backlight
     chown system system /sys/class/backlight/rk28_bl/brightness
     chown system system /sys/class/backlight/backlight/brightness
+    chown system system /sys/class/backlight/pwm-backlight/brightness
     
     # for hdmi
     chown root system /sys/class/display/HDMI/enable
@@ -143,8 +144,8 @@ on boot
     chmod 0664 /sys/class/graphics/fb0/bcsh
     chmod 0664 /sys/class/graphics/fb0/dsp_lut
 
-	chown system graphics /sys/class/graphics/fb0/scale
-	chmod 0664 /sys/class/graphics/fb0/scale
+    chown system graphics /sys/class/graphics/fb0/scale
+    chmod 0664 /sys/class/graphics/fb0/scale
 
     chown system system /sys/mali400_utility/utility
     chmod 0664 /sys/mali400_utility/utility
@@ -320,7 +321,7 @@ service shutdownanim /system/bin/bootanimation shutdown
 
 service rk_store_keybox /vendor/bin/rk_store_keybox
     class main
-    oneshot		
+    oneshot
 
 #vts audio property
 on property:vts.native_server.on=1