From: Axel Lin <axel.lin@gmail.com>
Date: Tue, 10 Apr 2012 06:20:03 +0000 (+0800)
Subject: regulator: max8997: Use simple equation to get selector
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=2358b7763ee6673c0d08ddf9dcfe96e982e9b26f;p=deliverable%2Flinux.git

regulator: max8997: Use simple equation to get selector

It's more efficient to get the best selector by simple equation.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 89c93d891140..db09244bb3ed 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -415,7 +415,7 @@ static inline int max8997_get_voltage_proper_val(
 		const struct voltage_map_desc *desc,
 		int min_vol, int max_vol)
 {
-	int i = 0;
+	int i;
 
 	if (desc == NULL)
 		return -EINVAL;
@@ -423,9 +423,10 @@ static inline int max8997_get_voltage_proper_val(
 	if (max_vol < desc->min || min_vol > desc->max)
 		return -EINVAL;
 
-	while (desc->min + desc->step * i < min_vol &&
-			desc->min + desc->step * i < desc->max)
-		i++;
+	if (min_vol < desc->min)
+		min_vol = desc->min;
+
+	i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
 
 	if (desc->min + desc->step * i > max_vol)
 		return -EINVAL;