From: kfx <kfx@rock-chips.com>
Date: Tue, 27 Sep 2011 07:02:19 +0000 (+0800)
Subject: set minimum clock frequency for 10Khz
X-Git-Tag: firefly_0821_release~9766^2~48
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d8ead40003106a92ff449d50c7a0a5856d911b3e;p=firefly-linux-kernel-4.4.55.git

set minimum clock frequency for 10Khz
---

diff --git a/drivers/i2c/busses/i2c-rk29.c b/drivers/i2c/busses/i2c-rk29.c
index 03715e2744c4..5049c1acb5d9 100755
--- a/drivers/i2c/busses/i2c-rk29.c
+++ b/drivers/i2c/busses/i2c-rk29.c
@@ -539,10 +539,16 @@ static int rk29_i2c_xfer(struct i2c_adapter *adap,
 	if(i2c->suspended ==1)
 		return -EIO;
 	*/
-	if(msgs[0].scl_rate <= 400000 && msgs[0].scl_rate > 0)
+	// 400k > scl_rate > 10k
+	if(msgs[0].scl_rate <= 400000 && msgs[0].scl_rate >= 10000)
 		i2c->scl_rate = msgs[0].scl_rate;
-	else
+	else if(msgs[0].scl_rate > 400000)
 		i2c->scl_rate = 400000;	
+	else{
+		dev_info(i2c->dev, "Warning: msg[0].scl_rate( = %dKhz) is too low!",
+			msgs[0].scl_rate/1000);
+		i2c->scl_rate = 10000;
+	}
 	rk29_i2c_clockrate(i2c);
 
 	i2c->udelay_time = RK29_UDELAY_TIME(i2c->scl_rate);