diff options
| author | Hoang Pham <hopham@nvidia.com> | 2010-01-15 14:28:24 -0800 |
|---|---|---|
| committer | Hoang Pham <hopham@nvidia.com> | 2010-01-15 14:28:24 -0800 |
| commit | b99caaf13da6d139ffaface3ad63713bca2ac2bd (patch) | |
| tree | e571ecb2842806915713e79875d7cdf6afad5ee1 /arch/arm/mach-tegra/nvrm/io/ap15 | |
| parent | 1322a0966db4e854ee6582eea738315be8888556 (diff) | |
tegra rm PWM: Fix pwm frequency factor between output and input source
to get PWM frequency output more accurate
Change-Id: If8b3f741ed001dd93e9bfbbb012bc50f43963e3f
Diffstat (limited to 'arch/arm/mach-tegra/nvrm/io/ap15')
| -rw-r--r-- | arch/arm/mach-tegra/nvrm/io/ap15/ap15rm_pwm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/nvrm/io/ap15/ap15rm_pwm.c b/arch/arm/mach-tegra/nvrm/io/ap15/ap15rm_pwm.c index 14c58e4e28f3..b18b9000a393 100644 --- a/arch/arm/mach-tegra/nvrm/io/ap15/ap15rm_pwm.c +++ b/arch/arm/mach-tegra/nvrm/io/ap15/ap15rm_pwm.c @@ -317,6 +317,7 @@ void NvRmPwmClose(NvRmPwmHandle hPwm) } #define MAX_DUTY_CYCLE 255 +#define PWM_FREQ_FACTOR 256 NvError NvRmPwmConfig( NvRmPwmHandle hPwm, @@ -386,7 +387,7 @@ NvError NvRmPwmConfig( if (status != NvSuccess) goto fail; - ClockFreqKHz = (RequestedFreqHzOrPeriod * MAX_DUTY_CYCLE) / 1000; + ClockFreqKHz = (RequestedFreqHzOrPeriod * PWM_FREQ_FACTOR) / 1000; if (ClockFreqKHz == 0) ClockFreqKHz = 1; @@ -405,7 +406,7 @@ NvError NvRmPwmConfig( if (status != NvSuccess) goto fail; - *pCurrentFreqHzOrPeriod = (ResultFreqKHz * 1000) / MAX_DUTY_CYCLE; + *pCurrentFreqHzOrPeriod = (ResultFreqKHz * 1000) / PWM_FREQ_FACTOR; if (Mode == NvRmPwmMode_Disable) PwmMode = 0; |