rk29: fix bl clock

[firefly-linux-kernel-4.4.55.git] / drivers / video / backlight / rk29_backlight.c

diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index 12843c7b29f311bbc254b7c18033a7ec8fc27737..db61c183d9c8b1adcd162201a3e2faf8c755a464 100644 (file)
--- a/drivers/video/backlight/rk29_backlight.c
+++ b/drivers/video/backlight/rk29_backlight.c
@@ -92,6 +92,9 @@ static s32 rk29_bl_get_brightness(struct backlight_device *bl)
 
        DBG("%s:: %d div_total: %d\n",__func__,__LINE__,div_total);
 
+    if (!div_total)
+        return 0;
+
     if (ref) {
         return BL_STEP*divh/div_total;
     } else {
@@ -240,7 +243,11 @@ static int rk29_backlight_probe(struct platform_device *pdev)
                __func__); 
                return -EEXIST;         
     }
-    
+
+    if (rk29_bl_info && rk29_bl_info->io_init) {
+        rk29_bl_info->io_init();
+    }
+
        rk29_bl = backlight_device_register("rk28_bl", &pdev->dev, NULL, &rk29_bl_ops);
        if (!rk29_bl) {
         DBG(KERN_CRIT "%s: backlight device register error\n",
@@ -248,8 +255,7 @@ static int rk29_backlight_probe(struct platform_device *pdev)
                return -ENODEV;         
        }
        
-       if (!pwm_clk)
-               pwm_clk = clk_get(NULL, "pwm");
+       pwm_clk = clk_get(NULL, "pwm");
        if (IS_ERR(pwm_clk)) {
                printk(KERN_ERR "failed to get pwm clock source\n");
                return -ENODEV; 
@@ -276,13 +282,12 @@ static int rk29_backlight_probe(struct platform_device *pdev)
     cpufreq_register_notifier(&rk29_bl_info->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
 #endif
         
-//     clk_disable(pwm_clk);
+    clk_enable(pwm_clk);
     write_pwm_reg(id, PWM_REG_CTRL, PWM_DIV|PWM_RESET);
     write_pwm_reg(id, PWM_REG_LRC, div_total);
     write_pwm_reg(id, PWM_REG_HRC, divh);
     write_pwm_reg(id, PWM_REG_CNTR, 0x0);
     write_pwm_reg(id, PWM_REG_CTRL, PWM_DIV|PWM_ENABLE|PWM_TIME_EN);
-       clk_enable(pwm_clk);
    
        rk29_bl->props.power = FB_BLANK_UNBLANK;
        rk29_bl->props.fb_blank = FB_BLANK_UNBLANK;
@@ -296,10 +301,6 @@ static int rk29_backlight_probe(struct platform_device *pdev)
     register_early_suspend(&bl_early_suspend);
 #endif
 
-    if (rk29_bl_info && rk29_bl_info->io_init) {
-        rk29_bl_info->io_init();
-    }
-
     return ret;
 }