linux-kernel - [PATCH 1/2] regulator: max8997: Use simple equation to get selector

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Message-ID: <1333466400.4720.1.camel@phoenix>
Date:	Tue, 03 Apr 2012 23:20:00 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 1/2] 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@...il.com>
---
 drivers/regulator/max8997.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 6e7beee..de752da 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -416,7 +416,7 @@ 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;
@@ -424,9 +424,10 @@ 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;
-- 
1.7.5.4



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