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authorShinya Kuribayashi <shinya.kuribayashi@necel.com>2009-11-06 21:49:14 +0900
committerBen Dooks <ben-linux@fluff.org>2009-12-09 00:19:11 +0000
commit26ea15b1f584de02bc85e9c3968d523386332f65 (patch)
treedbbd2db2557276ddb8934bdab36ad723909af5ad /drivers/i2c/busses/i2c-designware.c
parent81e798b73aec2d7ce06d18bd191b088c233e554f (diff)
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.c7
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) {