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authorShinya Kuribayashi <shinya.kuribayashi@necel.com>2009-11-06 21:48:55 +0900
committerBen Dooks <ben-linux@fluff.org>2009-12-09 00:19:11 +0000
commit81e798b73aec2d7ce06d18bd191b088c233e554f (patch)
tree4f3121a1708f0632cfec4d750dc064171e987dcf /drivers/i2c
parent21a89d4101ce338c2872401c82b66a7c155e24ab (diff)
downloadlinux-81e798b73aec2d7ce06d18bd191b088c233e554f.tar.bz2
i2c-designware: Divide i2c_dw_xfer_msg into two functions
We have some steps at the top of i2c_dw_xfer_msg() to set up a slave address and enable DW I2C core. And it's executed only when we don't have STATUS_WRITE_IN_PROGRESS. But we need to make sure that STATUS_WRITE_IN_PROGRESS only indicates that we have a pending i2c_msg to process. In other words, even if STATUS_WRITE_IN_PROGRESS is not set, that doesn't mean we're at initial state in the I2C transaction. Since i2c_dw_xfer_msg() will be invoked again and again during a transaction, those init steps have a possibility to be re-processed needlessly. For example, this issue easily takes place when processing a combined transaction with a certain condition (the number of tx bytes in the first i2c_msg, equals to the Tx FIFO depth). Consequently we should not use STATUS_WRITE_IN_PROGRESS to determine where we're at in an I2C transaction. It would be better to separate those initialization steps from i2c_dw_xfer_msg(). 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')
-rw-r--r--drivers/i2c/busses/i2c-designware.c45
1 files changed, 25 insertions, 20 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index 940bbf31bc8c..da5612b21aff 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -326,6 +326,29 @@ static int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
return 0;
}
+static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
+{
+ struct i2c_msg *msgs = dev->msgs;
+ u32 ic_con;
+
+ /* Disable the adapter */
+ writel(0, dev->base + DW_IC_ENABLE);
+
+ /* set the slave (target) address */
+ writel(msgs[dev->msg_write_idx].addr, dev->base + DW_IC_TAR);
+
+ /* if the slave address is ten bit address, enable 10BITADDR */
+ ic_con = readl(dev->base + DW_IC_CON);
+ if (msgs[dev->msg_write_idx].flags & I2C_M_TEN)
+ ic_con |= DW_IC_CON_10BITADDR_MASTER;
+ else
+ ic_con &= ~DW_IC_CON_10BITADDR_MASTER;
+ writel(ic_con, dev->base + DW_IC_CON);
+
+ /* Enable the adapter */
+ writel(1, dev->base + DW_IC_ENABLE);
+}
+
/*
* Initiate low level master read/write transaction.
* This function is called from i2c_dw_xfer when starting a transfer.
@@ -336,7 +359,7 @@ static void
i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
{
struct i2c_msg *msgs = dev->msgs;
- u32 ic_con, intr_mask;
+ 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);
u32 addr = msgs[dev->msg_write_idx].addr;
@@ -344,25 +367,6 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL;
- if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
- /* Disable the adapter */
- writel(0, dev->base + DW_IC_ENABLE);
-
- /* set the slave (target) address */
- writel(msgs[dev->msg_write_idx].addr, dev->base + DW_IC_TAR);
-
- /* if the slave address is ten bit address, enable 10BITADDR */
- ic_con = readl(dev->base + DW_IC_CON);
- if (msgs[dev->msg_write_idx].flags & I2C_M_TEN)
- ic_con |= DW_IC_CON_10BITADDR_MASTER;
- else
- ic_con &= ~DW_IC_CON_10BITADDR_MASTER;
- writel(ic_con, dev->base + DW_IC_CON);
-
- /* Enable the adapter */
- writel(1, dev->base + DW_IC_ENABLE);
- }
-
for (; dev->msg_write_idx < dev->msgs_num; dev->msg_write_idx++) {
/* if target address has changed, we need to
* reprogram the target address in the i2c
@@ -474,6 +478,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
goto done;
/* start the transfers */
+ i2c_dw_xfer_init(dev);
i2c_dw_xfer_msg(dev);
/* wait for tx to complete */