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author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-09-25 17:03:56 (GMT) |
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committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-09-25 17:03:56 (GMT) |
commit | 593d1006cdf710ab3469c0c37c184fea0bc3da97 (patch) | |
tree | e4db58440018a52089e8d6b39160f753ab10df99 /drivers/i2c/busses/i2c-pnx.c | |
parent | 5217192b85480353aeeb395574e60d0db04f3676 (diff) | |
parent | 9b20aa63b8fc9a6a3b6831f4eae3621755e51211 (diff) | |
download | linux-fsl-qoriq-593d1006cdf710ab3469c0c37c184fea0bc3da97.tar.xz |
Merge remote-tracking branch 'tip/core/rcu' into next.2012.09.25b
Resolved conflict in kernel/sched/core.c using Peter Zijlstra's
approach from https://lkml.org/lkml/2012/9/5/585.
Diffstat (limited to 'drivers/i2c/busses/i2c-pnx.c')
-rw-r--r-- | drivers/i2c/busses/i2c-pnx.c | 53 |
1 files changed, 31 insertions, 22 deletions
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c index 5d54416..8488bdd 100644 --- a/drivers/i2c/busses/i2c-pnx.c +++ b/drivers/i2c/busses/i2c-pnx.c @@ -48,8 +48,9 @@ enum { mcntrl_afie = 0x00000002, mcntrl_naie = 0x00000004, mcntrl_drmie = 0x00000008, - mcntrl_daie = 0x00000020, - mcntrl_rffie = 0x00000040, + mcntrl_drsie = 0x00000010, + mcntrl_rffie = 0x00000020, + mcntrl_daie = 0x00000040, mcntrl_tffie = 0x00000080, mcntrl_reset = 0x00000100, mcntrl_cdbmode = 0x00000400, @@ -290,31 +291,37 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data) * or we didn't 'ask' for it yet. */ if (ioread32(I2C_REG_STS(alg_data)) & mstatus_rfe) { - dev_dbg(&alg_data->adapter.dev, - "%s(): Write dummy data to fill Rx-fifo...\n", - __func__); + /* 'Asking' is done asynchronously, e.g. dummy TX of several + * bytes is done before the first actual RX arrives in FIFO. + * Therefore, ordered bytes (via TX) are counted separately. + */ + if (alg_data->mif.order) { + dev_dbg(&alg_data->adapter.dev, + "%s(): Write dummy data to fill Rx-fifo...\n", + __func__); - if (alg_data->mif.len == 1) { - /* Last byte, do not acknowledge next rcv. */ - val |= stop_bit; + if (alg_data->mif.order == 1) { + /* Last byte, do not acknowledge next rcv. */ + val |= stop_bit; + + /* + * Enable interrupt RFDAIE (data in Rx fifo), + * and disable DRMIE (need data for Tx) + */ + ctl = ioread32(I2C_REG_CTL(alg_data)); + ctl |= mcntrl_rffie | mcntrl_daie; + ctl &= ~mcntrl_drmie; + iowrite32(ctl, I2C_REG_CTL(alg_data)); + } /* - * Enable interrupt RFDAIE (data in Rx fifo), - * and disable DRMIE (need data for Tx) + * Now we'll 'ask' for data: + * For each byte we want to receive, we must + * write a (dummy) byte to the Tx-FIFO. */ - ctl = ioread32(I2C_REG_CTL(alg_data)); - ctl |= mcntrl_rffie | mcntrl_daie; - ctl &= ~mcntrl_drmie; - iowrite32(ctl, I2C_REG_CTL(alg_data)); + iowrite32(val, I2C_REG_TX(alg_data)); + alg_data->mif.order--; } - - /* - * Now we'll 'ask' for data: - * For each byte we want to receive, we must - * write a (dummy) byte to the Tx-FIFO. - */ - iowrite32(val, I2C_REG_TX(alg_data)); - return 0; } @@ -514,6 +521,7 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) alg_data->mif.buf = pmsg->buf; alg_data->mif.len = pmsg->len; + alg_data->mif.order = pmsg->len; alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ? I2C_SMBUS_READ : I2C_SMBUS_WRITE; alg_data->mif.ret = 0; @@ -566,6 +574,7 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) /* Cleanup to be sure... */ alg_data->mif.buf = NULL; alg_data->mif.len = 0; + alg_data->mif.order = 0; dev_dbg(&alg_data->adapter.dev, "%s(): exiting, stat = %x\n", __func__, ioread32(I2C_REG_STS(alg_data))); |