From 34b5ee1f6a7d01560f31be37dca3b2eb62877c50 Mon Sep 17 00:00:00 2001
From: Gabe Black <gabeblack@google.com>
Date: Thu, 28 Mar 2013 04:32:19 +0000
Subject: [PATCH] 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>
---
 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 de6140516c..6a0fa5862e 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 */
-- 
2.39.5