AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-26 19:30:53 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Shinya Kuribayashi 2009-11-06 21:49:39 +09:00 committed by Ben Dooks
parent 26ea15b1f5
commit ae72222d03
1 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/i2c/busses/i2c-designware.c
View File

@ -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);