From: addy ke <addy.ke@rock-chips.com>
Date: Fri, 8 Aug 2014 09:41:40 +0000 (+0800)
Subject: i2c: rk3x: fix interrupt handling issue
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9c5f7cad3acc69ce623d04d646950183a759949e;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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
---

diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
index a9791509966a..69e11853e8bf 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) {