diff options
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-octeon-core.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c index f322242cdbf8..7d4df8383b38 100644 --- a/drivers/i2c/busses/i2c-octeon-core.c +++ b/drivers/i2c/busses/i2c-octeon-core.c @@ -783,13 +783,14 @@ static void octeon_i2c_prepare_recovery(struct i2c_adapter *adap) { struct octeon_i2c *i2c = i2c_get_adapdata(adap); + octeon_i2c_hlc_disable(i2c); + /* - * The stop resets the state machine, does not _transmit_ STOP unless - * engine was active. + * Bring control register to a good state regardless + * of HLC state. */ - octeon_i2c_stop(i2c); + octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB); - octeon_i2c_hlc_disable(i2c); octeon_i2c_write_int(i2c, 0); } @@ -797,6 +798,15 @@ static void octeon_i2c_unprepare_recovery(struct i2c_adapter *adap) { struct octeon_i2c *i2c = i2c_get_adapdata(adap); + /* + * Generate STOP to finish the unfinished transaction. + * Can't generate STOP via the TWSI CTL register + * since it could bring the TWSI controller into an inoperable state. + */ + octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR | TWSI_INT_SCL_OVR); + udelay(5); + octeon_i2c_write_int(i2c, TWSI_INT_SDA_OVR); + udelay(5); octeon_i2c_write_int(i2c, 0); } |