Commit ae72222d authored by Shinya Kuribayashi's avatar Shinya Kuribayashi Committed by Ben Dooks

i2c-designware: Initialize byte count variables just prior to being used

As the driver and hardware always process the given data in parallel,
then it would be better to initialize tx_limit, rx_limit and rx_valid
variables just prior to being used.

This will help us to send / receive as much data as possible.
Signed-off-by: default avatarShinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: default avatarBaruch Siach <baruch@tkos.co.il>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 26ea15b1
......@@ -360,8 +360,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
{
struct i2c_msg *msgs = dev->msgs;
u32 intr_mask;
int tx_limit = dev->tx_fifo_depth - readl(dev->base + DW_IC_TXFLR);
int rx_limit = dev->rx_fifo_depth - readl(dev->base + DW_IC_RXFLR);
int tx_limit, rx_limit;
u32 addr = msgs[dev->msg_write_idx].addr;
u32 buf_len = dev->tx_buf_len;
u8 *buf = dev->tx_buf;;
......@@ -389,6 +388,9 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
buf_len = msgs[dev->msg_write_idx].len;
}
tx_limit = dev->tx_fifo_depth - readl(dev->base + DW_IC_TXFLR);
rx_limit = dev->rx_fifo_depth - readl(dev->base + DW_IC_RXFLR);
while (buf_len > 0 && tx_limit > 0 && rx_limit > 0) {
if (msgs[dev->msg_write_idx].flags & I2C_M_RD) {
writel(0x100, dev->base + DW_IC_DATA_CMD);
......@@ -418,7 +420,7 @@ i2c_dw_read(struct dw_i2c_dev *dev)
{
struct i2c_msg *msgs = dev->msgs;
u32 addr = msgs[dev->msg_read_idx].addr;
int rx_valid = readl(dev->base + DW_IC_RXFLR);
int rx_valid;
for (; dev->msg_read_idx < dev->msgs_num; dev->msg_read_idx++) {
u32 len;
......@@ -439,6 +441,8 @@ i2c_dw_read(struct dw_i2c_dev *dev)
buf = dev->rx_buf;
}
rx_valid = readl(dev->base + DW_IC_RXFLR);
for (; len > 0 && rx_valid > 0; len--, rx_valid--)
*buf++ = readl(dev->base + DW_IC_DATA_CMD);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment