i2c-pnx: Add stop conditions for end of transfer

Add a stop condition bit flag to the last byte in the transfer.
This will generate an extra clock to handle the stop condition
and prevent devices from staying in an ACK'd state.

Signed-off-by: Kevin Wells <wellsk40@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 68fa415d9ad552a93e8cf65164b184bd6a76bae1..a97e3fec814826c8676f60743025f0ba6988ca0c 100644 (file)
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -173,6 +173,9 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
                /* We still have something to talk about... */
                val = *alg_data->mif.buf++;
 
+               if (alg_data->mif.len == 1)
+                       val |= stop_bit;
+
                alg_data->mif.len--;
                iowrite32(val, I2C_REG_TX(alg_data));
 
@@ -246,6 +249,9 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
                        __func__);
 
                if (alg_data->mif.len == 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)