diff options
| author | Jan Glauber <jglauber@cavium.com> | 2016-12-09 10:31:55 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-12-11 22:58:34 +0100 |
| commit | ccee1a4cdcd02e748d39d2b121f7f82041893121 (patch) | |
| tree | 835d8c1535e2483f6721df6543d0620f000e1bb6 /drivers/i2c | |
| parent | f8989783d7a4b076cf11eea1347ed068ff4c2c77 (diff) | |
| download | linux-ccee1a4cdcd02e748d39d2b121f7f82041893121.tar.bz2 | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-octeon-core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c index 419b54bfc7c7..0b020703017d 100644 --- a/drivers/i2c/busses/i2c-octeon-core.c +++ b/drivers/i2c/busses/i2c-octeon-core.c @@ -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 |