diff --git a/drivers/gpu/arm/midgard/mali_kbase_core_linux.c b/drivers/gpu/arm/midgard/mali_kbase_core_linux.c
index ad44d4566ffd..d916644b0b81 100755
--- a/drivers/gpu/arm/midgard/mali_kbase_core_linux.c
+++ b/drivers/gpu/arm/midgard/mali_kbase_core_linux.c
@@ -99,7 +99,7 @@ EXPORT_SYMBOL(shared_kernel_test_data);
 
 #define KBASE_DRV_NAME "mali"
 /** rk_ext : version of rk_ext on mali_ko, aka. rk_ko_ver. */
-#define ROCKCHIP_VERSION 0x0b
+#define ROCKCHIP_VERSION    (12)
 
 static const char kbase_drv_name[] = KBASE_DRV_NAME;
 
diff --git a/drivers/gpu/arm/midgard/platform/rk/custom_log.h b/drivers/gpu/arm/midgard/platform/rk/custom_log.h
new file mode 100755
index 000000000000..8cd6bd37b451
--- /dev/null
+++ b/drivers/gpu/arm/midgard/platform/rk/custom_log.h
@@ -0,0 +1,222 @@
+/*  --------------------------------------------------------------------------------------------------------
+ *  File:   custom_log.h 
+ *
+ *  Desc:   ChenZhen 偏好的 log 输出的定制实现. 
+ *
+ *          -----------------------------------------------------------------------------------
+ *          < 习语 和 缩略语 > : 
+ *
+ *          -----------------------------------------------------------------------------------
+ *  Usage:		
+ *
+ *  Note:
+ *
+ *  Author: ChenZhen
+ *
+ *  --------------------------------------------------------------------------------------------------------
+ *  Version:
+ *          v1.0
+ *  --------------------------------------------------------------------------------------------------------
+ *  Log:
+	----Fri Nov 19 15:20:28 2010            v1.0
+ *        
+ *  --------------------------------------------------------------------------------------------------------
+ */
+
+
+#ifndef __CUSTOM_LOG_H__
+#define __CUSTOM_LOG_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ---------------------------------------------------------------------------------------------------------
+ *  Include Files
+ * ---------------------------------------------------------------------------------------------------------
+ */
+#include <linux/kernel.h>
+
+
+/* ---------------------------------------------------------------------------------------------------------
+ *  Macros Definition 
+ * ---------------------------------------------------------------------------------------------------------
+ */
+    
+/** 若下列 macro 有被定义, 才 使能 log 输出. */
+// #define ENABLE_DEBUG_LOG
+
+/** .! : 若需要全局地关闭 D log, 可以使能下面的代码. */
+/*
+#undef ENABLE_DEBUG_LOG
+#warning "custom debug log is disabled globally!"
+*/
+
+#define LOGD(fmt, args...) \
+    printk(KERN_DEBUG fmt "\n", ## args)
+
+/*---------------------------------------------------------------------------*/
+    
+#ifdef ENABLE_VERBOSE_LOG
+/** Verbose log. */
+#define V(fmt, args...) \
+    { printk(KERN_DEBUG "V : [File] : %s; [Line] : %d; [Func] : %s(); " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); }
+#else
+#define  V(...)  ((void)0)
+#endif
+
+
+#ifdef ENABLE_DEBUG_LOG
+/** Debug log. */
+#define D(fmt, args...) \
+    { printk(KERN_DEBUG "D : [File] : %s; [Line] : %d; [Func] : %s(); " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); }
+#else
+#define  D(...)  ((void)0)
+#endif
+
+#define I(fmt, args...) \
+    { printk(KERN_INFO "I : [File] : %s; [Line] : %d; [Func] : %s(); " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); }
+
+#define W(fmt, args...) \
+    { printk(KERN_WARNING "W : [File] : %s; [Line] : %d; [Func] : %s(); " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); }
+
+#define E(fmt, args...) \
+    { printk(KERN_ERR "E : [File] : %s; [Line] : %d; [Func] : %s(); " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); }
+
+/*-------------------------------------------------------*/
+
+/** 使用 D(), 以十进制的形式打印变量 'var' 的 value. */
+#define D_DEC(var)  D(#var " = %d.", var);
+
+#define E_DEC(var)  E(#var " = %d.", var);
+
+/** 使用 D(), 以十六进制的形式打印变量 'var' 的 value. */
+#define D_HEX(var)  D(#var " = 0x%x.", var);
+
+#define E_HEX(var)  E(#var " = 0x%x.", var);
+
+/** 使用 D(), 以十六进制的形式 打印指针类型变量 'ptr' 的 value. */
+#define D_PTR(ptr)  D(#ptr " = %p.", ptr);
+
+#define E_PTR(ptr)  E(#ptr " = %p.", ptr);
+
+/** 使用 D(), 打印 char 字串. */
+#define D_STR(pStr) \
+{\
+    if ( NULL == pStr )\
+    {\
+        D(#pStr" = NULL.");\
+    }\
+    else\
+    {\
+        D(#pStr" = '%s'.", pStr);\
+    }\
+}
+
+#define E_STR(pStr) \
+{\
+    if ( NULL == pStr )\
+    {\
+        E(#pStr" = NULL.");\
+    }\
+    else\
+    {\
+        E(#pStr" = '%s'.", pStr);\
+    }\
+}
+
+#ifdef ENABLE_DEBUG_LOG
+/**
+ * log 从 'pStart' 地址开始的 'len' 个字节的数据. 
+ */
+#define D_MEM(pStart, len) \
+    {\
+        int i = 0;\
+        char* p = (char*)pStart;\
+        D("dump memory from addr of '" #pStart "', from %p, length %d' : ", pStart, len); \
+        printk("\t\t");\
+        for ( i = 0; i < len ; i++ )\
+        {\
+            printk("0x%02x, ", p[i] );\
+        }\
+        printk("\n");\
+    }
+#else
+#define  D_MEM(...)  ((void)0)
+#endif
+
+/*-------------------------------------------------------*/
+
+#define EXIT_FOR_DEBUG \
+{\
+    E("To exit for debug.");\
+    return 1;\
+}
+
+/*-------------------------------------------------------*/
+
+/**
+ * 调用函数, 并检查返回值, 根据返回值决定是否跳转到指定的错误处理代码. 
+ * @param functionCall
+ *          对特定函数的调用, 该函数的返回值必须是 表征 成功 or err 的 整型数. 
+ *          这里, 被调用函数 "必须" 是被定义为 "返回 0 表示操作成功". 
+ * @param result
+ *		    用于记录函数返回的 error code 的 整型变量, 通常是 "ret" or "result" 等.
+ * @param label
+ *		    若函数返回错误, 程序将要跳转到的 错误处理处的 标号, 通常就是 "EXIT". 
+ */
+#define CHECK_FUNC_CALL(functionCall, result, label) \
+{\
+	if ( 0 != ( (result) = (functionCall) ) )\
+	{\
+		E("Function call returned error : " #result " = %d.", result);\
+		goto label;\
+	}\
+}
+
+/**
+ * 在特定条件下, 判定 error 发生, 对变量 'retVar' 设置 'errCode', 
+ * Log 输出对应的 Error Caution, 然后跳转 'label' 指定的代码处执行. 
+ * @param msg
+ *          纯字串形式的提示信息. 
+ * @param retVar
+ *		    标识函数执行状态或者结果的变量, 将被设置具体的 Error Code. 
+ *		    通常是 'ret' or 'result'. 
+ * @param errCode
+ *          表征特定 error 的常数标识, 通常是 宏的形态. 
+ * @param label
+ *          程序将要跳转到的错误处理代码的标号, 通常就是 'EXIT'. 
+ * @param args...
+ *          对应 'msgFmt' 实参中 '%s', '%d', ... 等 转换说明符 的具体可变长实参. 
+ */
+#define SET_ERROR_AND_JUMP(msgFmt, retVar, errCode, label, args...) \
+{\
+    E("To set '" #retVar "' to %d('" #errCode "'), because : " msgFmt, (errCode), ## args);\
+	(retVar) = (errCode);\
+	goto label;\
+}
+
+
+/* ---------------------------------------------------------------------------------------------------------
+ *  Types and Structures Definition
+ * ---------------------------------------------------------------------------------------------------------
+ */
+
+
+/* ---------------------------------------------------------------------------------------------------------
+ *  Global Functions' Prototype
+ * ---------------------------------------------------------------------------------------------------------
+ */
+
+
+/* ---------------------------------------------------------------------------------------------------------
+ *  Inline Functions Implementation 
+ * ---------------------------------------------------------------------------------------------------------
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CUSTOM_LOG_H__ */
+
diff --git a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_platform.c b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_platform.c
index 7b8d83c1475a..340f376332c4 100755
--- a/drivers/gpu/arm/midgard/platform/rk/mali_kbase_platform.c
+++ b/drivers/gpu/arm/midgard/platform/rk/mali_kbase_platform.c
@@ -43,6 +43,10 @@
 
 #include <linux/rockchip/dvfs.h> 
 
+#include "custom_log.h"
+
+/* ############################################################################################# */
+
 #define MALI_T7XX_DEFAULT_CLOCK 100000
 
 
@@ -266,6 +270,14 @@ static ssize_t error_count_show(struct device *dev,struct device_attribute *attr
 	struct kbase_device *kbdev = dev_get_drvdata(dev);
 	ssize_t ret;
 
+    D_PTR(dev);
+    if ( NULL == kbdev )
+    {
+        E("fail to get kbase_device instance.");
+        return 0;
+    }
+
+    D_DEC(kbdev->kbase_group_error);
 	ret = scnprintf(buf, PAGE_SIZE, "%d\n", kbdev->kbase_group_error);
 	return ret;
 }
@@ -837,10 +849,12 @@ int kbase_platform_create_sysfs_file(struct device *dev)
 		goto out;
 	}
 
+    /*  rk_ext : device will crash after "cat /sys/devices/ffa30000.gpu/dtlb".
 	if (device_create_file(dev, &dev_attr_dtlb)) {
 		dev_err(dev, "Couldn't create sysfs file [dtlb]\n");
 		goto out;
 	}
+    */
 
 	if (device_create_file(dev, &dev_attr_dvfs)) {
 		dev_err(dev, "Couldn't create sysfs file [dvfs]\n");