From: tanhua1 <tanhua1@lenovo.com>
Date: Wed, 13 Feb 2019 11:57:37 +0000 (+0800)
Subject: modify backlight chip configration for black screen
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=74a0e6c399aefc77efadba0e88f9f703a2e41ab7;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

modify backlight chip configration for black screen

Modify Backlight driver PWM hysteresis from 4LSBs to 3LSBs.
Fix the backlight can not be turned on after resume.

Change-Id: I8cfbc450f9920085ccdd79c42fa949a0369ea99d
Signed-off-by: xingbin <xingbin@huaqin.com>
Reviewed-on: https://gerrit.mot.com/1308605
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key
---

diff --git a/drivers/video/backlight/lm36923.c b/drivers/video/backlight/lm36923.c
index 2395472e1b1c..7ce4c37d0b38 100755
--- a/drivers/video/backlight/lm36923.c
+++ b/drivers/video/backlight/lm36923.c
@@ -256,6 +256,16 @@ static int lm36923_resume(struct lm36923_data *dev_data)
 	    pr_err("%s: kzalloc error\n",__func__);
 	    return -ENOMEM;
     }
+	if(mutex_trylock(&dev_data->lock)==0){
+		pr_err("%s: lm36923 dev is busy\n",__func__);
+		goto exit;
+	}
+	ret = backlight_i2c_write(dev_data, LM_PWMCTL_REG, 0xEE);
+	if(ret < 0) {
+		pr_err("%s: write new value[0xEE] to reg[0x%x] error\n", __func__, LM_PWMCTL_REG);
+	}
+	mutex_unlock(&dev_data->lock);
+
     pr_info("%s:now write mode to %d\n",__func__,dev_data->mode);
     if(1 == dev_data->mode){
 	        if(mutex_trylock(&dev_data->lock)==0){
@@ -393,6 +403,10 @@ static int lm36923_probe(struct i2c_client *client,
         if(ret < 0){
             pr_err("%s:NR mode:write lm chip MSB error\n",__func__);
         }
+        ret = backlight_i2c_write(lm, LM_PWMCTL_REG, 0xEE);
+		if(ret < 0) {
+            pr_err("%s: write new value[0xEE] to reg[0x%x] error\n", __func__, LM_PWMCTL_REG);
+        }
         mutex_unlock(&lm->lock);
     }
     else{