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 paremters 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 <gabebl...@google.com>
Signed-off-by: Akshay Saraswat <aksha...@samsung.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes since v1:
- Added "Acked-by: Simon Glass".
arch/arm/cpu/armv7/s5p-common/timer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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 */
--
1.8.0
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