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authorGabe Black <gabeblack@google.com>2013-03-28 04:32:19 +0000
committerMinkyu Kang <mk7.kang@samsung.com>2013-04-01 14:02:08 +0900
commit34b5ee1f6a7d01560f31be37dca3b2eb62877c50 (patch)
treeceda23a29b4a2c85d731965280d8d8bb08432ebd /arch/arm/cpu/armv7
parentc059f274ade1a5f7d1f39927d8b31a41cba9034c (diff)
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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')
-rw-r--r--arch/arm/cpu/armv7/s5p-common/timer.c2
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 */