From: zwp <zwp@rock-chips.com>
Date: Mon, 11 Jul 2011 03:33:04 +0000 (-0700)
Subject: HYM8563 RTC: combine several i2c operations to one operation in oder to prevent kerne... 
X-Git-Tag: firefly_0821_release~10129^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5b492ba019c392089cd370e224ff5d7a61236ead;p=firefly-linux-kernel-4.4.55.git

HYM8563 RTC: combine several i2c operations to one operation in oder to prevent kernel crashing when alarm suspend.

闹钟休眠的时候需要进行i2c传输，某些情况下会出现休眠时i2c超时的情况，导致系统崩溃。
原来连续地址的i2c读写分为1个字节的多次传输，这里将其改为多个字节的一次传输
---

diff --git a/drivers/rtc/rtc-HYM8563.c b/drivers/rtc/rtc-HYM8563.c
index 1b5690d08049..9c6f9b72f68c 100644
--- a/drivers/rtc/rtc-HYM8563.c
+++ b/drivers/rtc/rtc-HYM8563.c
@@ -93,9 +93,11 @@ static int hym8563_read_datetime(struct i2c_client *client, struct rtc_time *tm)
 	u8 i,regs[HYM8563_RTC_SECTION_LEN] = { 0, };
     
 	mutex_lock(&hym8563->mutex);
-	for (i = 0; i < HYM8563_RTC_SECTION_LEN; i++) {
-		hym8563_i2c_read_regs(client, RTC_SEC+i, &regs[i], 1);
-	}	
+//	for (i = 0; i < HYM8563_RTC_SECTION_LEN; i++) {
+//		hym8563_i2c_read_regs(client, RTC_SEC+i, &regs[i], 1);
+//	}
+	hym8563_i2c_read_regs(client, RTC_SEC, regs, HYM8563_RTC_SECTION_LEN);
+
 	mutex_unlock(&hym8563->mutex);
 	
 	tm->tm_sec = bcd2bin(regs[0x00] & 0x7F);
@@ -181,9 +183,11 @@ static int hym8563_set_time(struct i2c_client *client, struct rtc_time *tm)
 	regs[0x05] = (regs[0x05] & 0x80)| (bin2bcd(tm->tm_mon + 1) & 0x7F);		//set  the  month
 	
 	mutex_lock(&hym8563->mutex);
-	for(i=0;i<HYM8563_RTC_SECTION_LEN;i++){
-		ret = hym8563_i2c_set_regs(client, RTC_SEC+i, &regs[i], 1);
-	}
+//	for(i=0;i<HYM8563_RTC_SECTION_LEN;i++){
+//		ret = hym8563_i2c_set_regs(client, RTC_SEC+i, &regs[i], 1);
+//	}
+	hym8563_i2c_set_regs(client, RTC_SEC, regs, HYM8563_RTC_SECTION_LEN);
+
 	mutex_unlock(&hym8563->mutex);
 
 	return 0;