diff options
| author | Shinya Kuribayashi <shinya.kuribayashi@necel.com> | 2009-11-06 15:47:30 +0300 |
|---|---|---|
| committer | Ben Dooks <ben-linux@fluff.org> | 2009-12-09 03:19:10 +0300 |
| commit | c70c5cd37413c3fa3503212d26ffdf6df535c9de (patch) | |
| tree | 4300e286c5f0d30138404217679d08729a45a1d7 /drivers/i2c | |
| parent | d60c7e81dda2041302791c6a5261bd0c74d60fba (diff) | |
| download | linux-c70c5cd37413c3fa3503212d26ffdf6df535c9de.tar.xz | |
i2c-designware: i2c_dw_xfer_msg: Fix i2c_msg search bug
In case a work-in-progress i2c_msg has more bytes to be written, we
need to set STATUS_WRITE_IN_PROGRESS and exit from the msg_write_idx-
searching loop. Otherwise, we will overtake the current msg_write_idx
without waiting for its transmission to be processed.
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index cdfd94e41ccc..bfb42f0f87a6 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -338,6 +338,8 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) u32 addr = msgs[dev->msg_write_idx].addr; u32 buf_len = dev->tx_buf_len; + intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT; + if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) { /* Disable the adapter */ writel(0, dev->base + DW_IC_ENABLE); @@ -387,17 +389,19 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) dev->base + DW_IC_DATA_CMD); tx_limit--; buf_len--; } + + dev->tx_buf_len = buf_len; + + if (buf_len > 0) { + /* more bytes to be written */ + intr_mask |= DW_IC_INTR_TX_EMPTY; + dev->status |= STATUS_WRITE_IN_PROGRESS; + break; + } else + dev->status &= ~STATUS_WRITE_IN_PROGRESS; } - intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT; - if (buf_len > 0) { /* more bytes to be written */ - intr_mask |= DW_IC_INTR_TX_EMPTY; - dev->status |= STATUS_WRITE_IN_PROGRESS; - } else - dev->status &= ~STATUS_WRITE_IN_PROGRESS; writel(intr_mask, dev->base + DW_IC_INTR_MASK); - - dev->tx_buf_len = buf_len; } static void |