shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 20:07:46 +09:00
Code Issues Packages Projects Releases Wiki Activity

UPSTREAM: regulator: pwm: Fix calculation of voltage-to-duty cycle

Browse Source 
With following equation for calculating
voltage_to_duty_cycle_percentage
	100 - (((req_uV * 100) - (min_uV * 100)) / diff);

we get 0% for max_uV and 100% for min_uV.

Correcting this to
	((req_uV * 100) - (min_uV * 100)) / diff;
 to get proper duty cycle.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 1aaab34878)

Change-Id: I61d88577ece2d7bec3e9ea6c863c101c65892271
Signed-off-by: David Wu <david.wu@rock-chips.com>
This commit is contained in:
Laxman Dewangan
2016-03-08 16:23:21 +05:30
committed by Huang, Tao
parent f9d2815edc
commit 4df4795120
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/regulator/pwm-regulator.c
View File

@@ -115,7 +115,7 @@ static int pwm_voltage_to_duty_cycle_percentage(struct regulator_dev *rdev, int
int max_uV = rdev->constraints->max_uV;
int diff = max_uV - min_uV;
return 100 - (((req_uV * 100) - (min_uV * 100)) / diff);
return ((req_uV * 100) - (min_uV * 100)) / diff;
}
static int pwm_regulator_get_voltage(struct regulator_dev *rdev)