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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
This commit is contained in:
addy ke 2014-08-08 17:41:40 +08:00 committed by Wolfram Sang
parent 64bdfbfc76
commit 9c5f7cad3a
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/busses/i2c-rk3x.c
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@ -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) {