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| author | Shinya Kuribayashi | 2009-11-06 13:49:14 +0100 |
|---|---|---|
| committer | Ben Dooks | 2009-12-09 01:19:11 +0100 |
| commit | 26ea15b1f584de02bc85e9c3968d523386332f65 (patch) | |
| tree | dbbd2db2557276ddb8934bdab36ad723909af5ad /drivers/i2c/busses/i2c-designware.c | |
| parent | i2c-designware: Divide i2c_dw_xfer_msg into two functions (diff) | |
| download | kernel-qcow2-linux-26ea15b1f584de02bc85e9c3968d523386332f65.tar.gz kernel-qcow2-linux-26ea15b1f584de02bc85e9c3968d523386332f65.tar.xz kernel-qcow2-linux-26ea15b1f584de02bc85e9c3968d523386332f65.zip | |
i2c-designware: i2c_dw_xfer_msg: Introduce a local "buf" pointer
While we have a local variable "buf_len" for dev->tx_buf_len, we don't
have such local variable for dev->tx_buf pointer. While "buf_len" is
restored at first then updated when we start processing a new i2c_msg
(determined by STATUS_WRITE_IN_PROGRESS flag), ->tx_buf is different.
Such inconsistency makes the code slightly hard to follow.
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-designware.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index da5612b21aff..e8e2212d576e 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -364,6 +364,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) int rx_limit = dev->rx_fifo_depth - readl(dev->base + DW_IC_RXFLR); u32 addr = msgs[dev->msg_write_idx].addr; u32 buf_len = dev->tx_buf_len; + u8 *buf = dev->tx_buf;; intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL; @@ -384,7 +385,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) { /* new i2c_msg */ - dev->tx_buf = msgs[dev->msg_write_idx].buf; + buf = msgs[dev->msg_write_idx].buf; buf_len = msgs[dev->msg_write_idx].len; } @@ -393,11 +394,11 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) writel(0x100, dev->base + DW_IC_DATA_CMD); rx_limit--; } else - writel(*(dev->tx_buf++), - dev->base + DW_IC_DATA_CMD); + writel(*buf++, dev->base + DW_IC_DATA_CMD); tx_limit--; buf_len--; } + dev->tx_buf = buf; dev->tx_buf_len = buf_len; if (buf_len > 0) { |