From: yxj <yxj@rock-chips.com>
Date: Sat, 29 Jun 2013 06:11:49 +0000 (+0800)
Subject: rk screen:fix Makefile,only update lcd.h when the source file is changed
X-Git-Tag: firefly_0821_release~6965^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e84b364c5866d13d2e1fa62b53cad9b13b47a271;p=firefly-linux-kernel-4.4.55.git

rk screen:fix Makefile,only update lcd.h when the source file is changed
---

diff --git a/drivers/video/rockchip/screen/Makefile b/drivers/video/rockchip/screen/Makefile
index e415adfa24f4..28cd07302921 100644
--- a/drivers/video/rockchip/screen/Makefile
+++ b/drivers/video/rockchip/screen/Makefile
@@ -65,7 +65,7 @@ obj-$(CONFIG_LCD_LD089WU1_MIPI)   += lcd_LD089WU1_mipi.o
 
 
 quiet_cmd_gen = GEN     $@
-      cmd_gen = cp -a $< $@
+      cmd_gen = cmp -s $< $@ || cp $< $@
 
 lcd-obj := $(filter lcd_%.o,$(obj-y))
 lcd-cfile := $(patsubst %.o,%.c,$(lcd-obj))