Shinya Kuribayashi wrote:
As wait_for_completion_interruptible_timeout() will be invoked after
the first call to i2c_dw_xfer_msg() is made whether or not an error is
detected in it, we need to mark ->cmd_complete as completed to avoid a
needless HZ timeout.
diff --git a/drivers/i2c/busses/i2c-designware.c
b/drivers/i2c/busses/i2c-designware.c
index f7ea032..6f85e28 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -376,6 +376,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
dev_err(dev->dev,
"%s: invalid message length\n", __func__);
dev->msg_err = -EINVAL;
+ complete(&dev->cmd_complete);
return;
}
It turned out to be incomplete, I confimred with I2C_FUNC_SMBUS_QUICK
flag for testing.
In [PATCH 10/16] (Do dw_i2c_pump_msg's jobs in the interrutp handler),
I deleted the following line from the interrupt handler,
- writel(0, dev->base + DW_IC_INTR_MASK); /* disable interrupts */
so some interrupt bits, namely RX_FULL and somtimes TX_EMPTY, are now
kept _opened_ by default. In error handling procedures, we need to
disable them or shutdown DW I2C core properly, otherwise those
interrupts continue to be asserted.
In addition, I noticed that we need similar treatments in target addr
inconsistency checking path.
Here's problematic parts. I'll sort out these bits, later.
---
drivers/i2c/busses/i2c-designware.c | 18 ++++++++++++++++--
1 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware.c
b/drivers/i2c/busses/i2c-designware.c
index 060f2dd..70aaaec 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -370,13 +370,21 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
* reprogram the target address in the i2c
* adapter when we are done with this transfer
*/
- if (msgs[dev->msg_write_idx].addr != addr)
+ if (msgs[dev->msg_write_idx].addr != addr) {
+ dev_err(dev->dev,
+ "%s: invalid message address\n", __func__);
+ dev->msg_err = -EINVAL;
+ writel(0, dev->base + DW_IC_ENABLE);
+ complete(&dev->cmd_complete);
return;
+ }
if (msgs[dev->msg_write_idx].len == 0) {
dev_err(dev->dev,
"%s: invalid message length\n", __func__);
dev->msg_err = -EINVAL;
+ writel(0, dev->base + DW_IC_ENABLE);
+ complete(&dev->cmd_complete);
return;
}
@@ -430,8 +438,14 @@ i2c_dw_read(struct dw_i2c_dev *dev)
continue;
/* different i2c client, reprogram the i2c adapter */
- if (msgs[dev->msg_read_idx].addr != addr)
+ if (msgs[dev->msg_read_idx].addr != addr) {
+ dev_err(dev->dev,
+ "%s: invalid message address\n", __func__);
+ dev->msg_err = -EINVAL;
+ writel(0, dev->base + DW_IC_ENABLE);
+ complete(&dev->cmd_complete);
return;
+ }
if (!(dev->status & STATUS_READ_IN_PROGRESS)) {
len = msgs[dev->msg_read_idx].len;
--
Shinya Kuribayashi
NEC Electronics
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