diff options
| -rw-r--r-- | drivers/i2c/busses/i2c-sh_mobile.c | 60 |
1 files changed, 34 insertions, 26 deletions
diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c index daaf0ebe817..2767ea8e98a 100644 --- a/drivers/i2c/busses/i2c-sh_mobile.c +++ b/drivers/i2c/busses/i2c-sh_mobile.c @@ -495,6 +495,37 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg) return 0; } +static int poll_busy(struct sh_mobile_i2c_data *pd) +{ + int i; + + for (i = 1000; i; i--) { + u_int8_t val = iic_rd(pd, ICSR); + + dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr); + + /* the interrupt handler may wake us up before the + * transfer is finished, so poll the hardware + * until we're done. + */ + if (!(val & ICSR_BUSY)) { + /* handle missing acknowledge and arbitration lost */ + if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) + return -EIO; + break; + } + + udelay(10); + } + + if (!i) { + dev_err(pd->dev, "Polling timed out\n"); + return -ETIMEDOUT; + } + + return 0; +} + static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) @@ -502,8 +533,7 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter); struct i2c_msg *msg; int err = 0; - u_int8_t val; - int i, k, retry_count; + int i, k; activate_ch(pd); @@ -527,31 +557,9 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter, break; } - retry_count = 1000; -again: - val = iic_rd(pd, ICSR); - - dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr); - - /* the interrupt handler may wake us up before the - * transfer is finished, so poll the hardware - * until we're done. - */ - if (val & ICSR_BUSY) { - udelay(10); - if (retry_count--) - goto again; - - err = -EIO; - dev_err(pd->dev, "Polling timed out\n"); + err = poll_busy(pd); + if (err < 0) break; - } - - /* handle missing acknowledge and arbitration lost */ - if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) { - err = -EIO; - break; - } } deactivate_ch(pd); |