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authorKevin Wells <wellsk40@gmail.com>2010-03-16 18:55:37 -0400
committerBen Dooks <ben-linux@fluff.org>2010-04-19 20:16:57 -0400
commit28ad3321a1ac732c7fe37d5be85f67fe40ef18a9 (patch)
tree97b5c130393adaa794d4ce2fec568742681d89d0 /drivers/i2c/busses/i2c-pnx.c
parentbe80dbaa3ed64337693be58fb2f3808e78911ba6 (diff)
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>
Diffstat (limited to 'drivers/i2c/busses/i2c-pnx.c')
-rw-r--r--drivers/i2c/busses/i2c-pnx.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 68fa415d9ad5..a97e3fec8148 100644
--- 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)
173 /* We still have something to talk about... */ 173 /* We still have something to talk about... */
174 val = *alg_data->mif.buf++; 174 val = *alg_data->mif.buf++;
175 175
176 if (alg_data->mif.len == 1)
177 val |= stop_bit;
178
176 alg_data->mif.len--; 179 alg_data->mif.len--;
177 iowrite32(val, I2C_REG_TX(alg_data)); 180 iowrite32(val, I2C_REG_TX(alg_data));
178 181
@@ -246,6 +249,9 @@ static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
246 __func__); 249 __func__);
247 250
248 if (alg_data->mif.len == 1) { 251 if (alg_data->mif.len == 1) {
252 /* Last byte, do not acknowledge next rcv. */
253 val |= stop_bit;
254
249 /* 255 /*
250 * Enable interrupt RFDAIE (data in Rx fifo), 256 * Enable interrupt RFDAIE (data in Rx fifo),
251 * and disable DRMIE (need data for Tx) 257 * and disable DRMIE (need data for Tx)