Commit 34b5ee1f authored by Gabe Black's avatar Gabe Black Committed by Minkyu Kang
Browse files

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: default avatarGabe Black <gabeblack@google.com>
Signed-off-by: default avatarAkshay Saraswat <akshay.s@samsung.com>
Acked-by: default avatarSimon Glass <sjg@chromium.org>
Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
parent c059f274
......@@ -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 */
......
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