* [PATCH 1/2] regulator: max8997: Use simple equation to get selector
@ 2012-04-03 15:20 Axel Lin
2012-04-03 15:21 ` [PATCH 2/2] regulator: max8998: " Axel Lin
0 siblings, 1 reply; 2+ messages in thread
From: Axel Lin @ 2012-04-03 15:20 UTC (permalink / raw)
To: linux-kernel; +Cc: Kyungmin Park, MyungJoo Ham, Liam Girdwood, Mark Brown
It's more efficient to get the best selector by simple equation.
Signed-off-by: Axel Lin <axel.lin@gmail.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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 2/2] regulator: max8998: Use simple equation to get selector
2012-04-03 15:20 [PATCH 1/2] regulator: max8997: Use simple equation to get selector Axel Lin
@ 2012-04-03 15:21 ` Axel Lin
0 siblings, 0 replies; 2+ messages in thread
From: Axel Lin @ 2012-04-03 15:21 UTC (permalink / raw)
To: linux-kernel; +Cc: Kyungmin Park, MyungJoo Ham, Liam Girdwood, Mark Brown
It's more efficient to get the best selector by simple equation.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
drivers/regulator/max8998.c | 19 ++++++++++---------
1 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 5890265..90b3193 100644
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -306,8 +306,7 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
const struct voltage_map_desc *desc;
int ldo = rdev_get_id(rdev);
- int reg, shift = 0, mask, ret;
- int i = 0;
+ int reg, shift = 0, mask, ret, i;
if (ldo >= ARRAY_SIZE(ldo_voltage_map))
return -EINVAL;
@@ -319,9 +318,10 @@ static int max8998_set_voltage_ldo(struct regulator_dev *rdev,
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;
@@ -359,7 +359,7 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
const struct voltage_map_desc *desc;
int buck = rdev_get_id(rdev);
int reg, shift = 0, mask, ret;
- int difference = 0, i = 0, j = 0, previous_vol = 0;
+ int difference = 0, i, j = 0, previous_vol = 0;
u8 val = 0;
static u8 buck1_last_val;
@@ -374,9 +374,10 @@ static int max8998_set_voltage_buck(struct regulator_dev *rdev,
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-04-03 15:21 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-04-03 15:20 [PATCH 1/2] regulator: max8997: Use simple equation to get selector Axel Lin
2012-04-03 15:21 ` [PATCH 2/2] regulator: max8998: " Axel Lin
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).