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| author | Gabe Black <gabeblack@google.com> | 2013-03-28 04:32:19 +0000 |
|---|---|---|
| committer | Minkyu Kang <mk7.kang@samsung.com> | 2013-04-01 14:02:08 +0900 |
| commit | 34b5ee1f6a7d01560f31be37dca3b2eb62877c50 (patch) | |
| tree | ceda23a29b4a2c85d731965280d8d8bb08432ebd /arch/arm/cpu/armv7/s5p-common | |
| parent | c059f274ade1a5f7d1f39927d8b31a41cba9034c (diff) | |
| download | u-boot-imx-34b5ee1f6a7d01560f31be37dca3b2eb62877c50.zip u-boot-imx-34b5ee1f6a7d01560f31be37dca3b2eb62877c50.tar.gz u-boot-imx-34b5ee1f6a7d01560f31be37dca3b2eb62877c50.tar.bz2 | |
Exynos: Avoid a divide by zero by specifying a non-zero period for pwm 4
The pwm_config function in the exynos pwm driver divides by its period
period parameter. A function was calling pwm_config with a 0ns period and a
0ns duty cycle. That doesn't actually make any sense physically, and results
in a divide by zero in the driver. This change changes the parameters to be a
100000ns period and duty cycle.
Test with command "sf probe 1:0; time sf read 40008000 0 1000".
Try with different numbers of bytes and see that sane values are obtained
Build and boot U-boot with this patch, backlight works properly.
Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Diffstat (limited to 'arch/arm/cpu/armv7/s5p-common')
| -rw-r--r-- | arch/arm/cpu/armv7/s5p-common/timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv7/s5p-common/timer.c b/arch/arm/cpu/armv7/s5p-common/timer.c index de61405..6a0fa58 100644 --- a/arch/arm/cpu/armv7/s5p-common/timer.c +++ b/arch/arm/cpu/armv7/s5p-common/timer.c @@ -58,7 +58,7 @@ int timer_init(void) { /* PWM Timer 4 */ pwm_init(4, MUX_DIV_4, 0); - pwm_config(4, 0, 0); + pwm_config(4, 100000, 100000); pwm_enable(4); /* Use this as the current monotonic time in us */ |