From 6f4217a5f06305d2f707b9a094154b97be39885b Mon Sep 17 00:00:00 2001
From: chenxing <chenxing@rock-chips.com>
Date: Fri, 30 Aug 2013 17:58:53 +0800
Subject: [PATCH] rk3188: adjust leakage table && support Low freq add some
 voltage for low leakage chip

---
 arch/arm/mach-rk3188/dvfs.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/mach-rk3188/dvfs.c b/arch/arm/mach-rk3188/dvfs.c
index b3f69742e207..e11a07c11b7c 100755
--- a/arch/arm/mach-rk3188/dvfs.c
+++ b/arch/arm/mach-rk3188/dvfs.c
@@ -93,9 +93,12 @@ static struct lkg_maxvolt lkg_volt_table[] = {
 /* avdd_com & vdd_arm short circuit */
 static struct lkg_maxvolt lkg_volt_table[] = {
 	{.leakage_level = 3,	.maxvolt = 1350 * 1000},
+	{.leakage_level = 5,	.maxvolt = 1300 * 1000},
 	{.leakage_level = 15,	.maxvolt = 1250 * 1000},
 };
 #endif
+#define LOW_LEAKAGE_BOUND	2
+#define VOLT_COMPENSATION	(25000)	// uV
 static int leakage_level = 0;
 #define MHZ	(1000 * 1000)
 #define KHZ	(1000)
@@ -154,6 +157,7 @@ void dvfs_adjust_table_lmtvolt(struct clk *clk, struct cpufreq_frequency_table *
 		}
 	}
 
+	// limit high voltage
 	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
 		if (table[i].index > maxvolt) {
 			printk("\t\tadjust table freq=%d KHz, index=%d mV", table[i].frequency, table[i].index);
@@ -161,6 +165,26 @@ void dvfs_adjust_table_lmtvolt(struct clk *clk, struct cpufreq_frequency_table *
 			printk(" to index=%d mV\n", table[i].index);
 		}
 	}
+#if 0
+	/*
+	 * Low freq add some voltage for low leakage chip.
+	 * Open it when necessary.
+	 *
+	 */
+
+	// limit low voltage
+	if (strncmp(clk->dvfs_info->name, "cpu", strlen("cpu")) == 0
+			&& leakage_level <= LOW_LEAKAGE_BOUND) {
+		for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
+			if (table[i].index + VOLT_COMPENSATION < maxvolt) {
+				printk("\t\tadjust table freq=%d KHz, index=%d mV",
+						table[i].frequency, table[i].index);
+				table[i].index += VOLT_COMPENSATION;
+				printk(" to index=%d mV\n", table[i].index);
+			}
+		}
+	}
+#endif
 }
 
 #define NO_VOLT_DIFF
-- 
2.34.1