diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-at91.c')
-rw-r--r-- | drivers/i2c/busses/i2c-at91.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index d51bf536bdf7..29947eb905fb 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -757,6 +757,7 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num) unsigned int_addr_flag = 0; struct i2c_msg *m_start = msg; bool is_read; + u8 *dma_buf = NULL; dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num); @@ -804,7 +805,17 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num) dev->msg = m_start; dev->recv_len_abort = false; + if (dev->use_dma) { + dma_buf = i2c_get_dma_safe_msg_buf(m_start, 1); + if (!dma_buf) { + ret = -ENOMEM; + goto out; + } + dev->buf = dma_buf; + } + ret = at91_do_twi_transfer(dev); + i2c_put_dma_safe_msg_buf(dma_buf, m_start, !ret); ret = (ret < 0) ? ret : num; out: |