linux-kernel - [PATCH 3.16 050/125] i2c: rk3x: fix interrupt handling issue

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Message-Id: <20140903220625.147499867@linuxfoundation.org>
Date:	Wed,  3 Sep 2014 15:06:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Addy Ke <addy.ke@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH 3.16 050/125] i2c: rk3x: fix interrupt handling issue

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: addy ke <addy.ke@...k-chips.com>

commit 9c5f7cad3acc69ce623d04d646950183a759949e upstream.

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@...k-chips.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/i2c/busses/i2c-rk3x.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 irqn
 	}
 
 	/* 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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