From 9c5f7cad3acc69ce623d04d646950183a759949e Mon Sep 17 00:00:00 2001
From: addy ke <addy.ke@rock-chips.com>
Date: Fri, 8 Aug 2014 17:41:40 +0800
Subject: [PATCH] i2c: rk3x: fix interrupt handling issue
If slave holds scl, I2C_IPD[7] will be set 1 by controller
for debugging. Driver must ignore it.
[ 5.752391] rk3x-i2c ff160000.i2c: unexpected irq in WRITE: 0x80
[ 5.939027] rk3x-i2c ff160000.i2c: timeout, ipd: 0x80, state: 4
Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
---
drivers/i2c/busses/i2c-rk3x.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
index a9791509966a07..69e11853e8bff1 100644
--- a/drivers/i2c/busses/i2c-rk3x.c
+++ b/drivers/i2c/busses/i2c-rk3x.c
@@ -399,7 +399,7 @@ static irqreturn_t rk3x_i2c_irq(int irqno, void *dev_id)
}
/* is there anything left to handle? */
- if (unlikely(ipd == 0))
+ if (unlikely((ipd & REG_INT_ALL) == 0))
goto out;
switch (i2c->state) {
--
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