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i2c: octeon: thunderx: TWSI software reset in recovery 

I've seen i2c recovery reporting long loops of:

[ 1035.887818] i2c i2c-4: SCL is stuck low, exit recovery
[ 1037.999748] i2c i2c-4: SCL is stuck low, exit recovery
[ 1040.111694] i2c i2c-4: SCL is stuck low, exit recovery
...

Add a TWSI software reset which clears the status and
STA,STP,IFLG in SW_TWSI_EOP_TWSI_CTL.

With this the recovery works fine and above message is not seen.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
hifive-unleashed-5.1
Jan Glauber 2016-12-09 10:31:55 +01:00 committed by Wolfram Sang
parent f8989783d7
commit ccee1a4cdc
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/busses/i2c-octeon-core.c
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@ -791,6 +791,9 @@ static void octeon_i2c_prepare_recovery(struct i2c_adapter *adap)
struct octeon_i2c *i2c = i2c_get_adapdata(adap);
octeon_i2c_hlc_disable(i2c);
octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_RST, 0);
/* wait for software reset to settle */
udelay(5);
/*
* Bring control register to a good state regardless