diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-bit.c | 8 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-mxs.c | 13 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.c | 12 |
3 files changed, 25 insertions, 8 deletions
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c index 525c7345fa0..24f94f4ae39 100644 --- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -103,8 +103,14 @@ static int sclhi(struct i2c_algo_bit_data *adap) * chips may hold it low ("clock stretching") while they * are processing data internally. */ - if (time_after(jiffies, start + adap->timeout)) + if (time_after(jiffies, start + adap->timeout)) { + /* Test one last time, as we may have been preempted + * between last check and timeout test. + */ + if (getscl(adap)) + break; return -ETIMEDOUT; + } cond_resched(); } #ifdef DEBUG diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c index 7e78f7c8785..3d471d56bf1 100644 --- a/drivers/i2c/busses/i2c-mxs.c +++ b/drivers/i2c/busses/i2c-mxs.c @@ -72,6 +72,7 @@ #define MXS_I2C_QUEUESTAT (0x70) #define MXS_I2C_QUEUESTAT_RD_QUEUE_EMPTY 0x00002000 +#define MXS_I2C_QUEUESTAT_WRITE_QUEUE_CNT_MASK 0x0000001F #define MXS_I2C_QUEUECMD (0x80) @@ -219,14 +220,14 @@ static int mxs_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int ret; int flags; - init_completion(&i2c->cmd_complete); - dev_dbg(i2c->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", msg->addr, msg->len, msg->flags, stop); if (msg->len == 0) return -EINVAL; + init_completion(&i2c->cmd_complete); + flags = stop ? MXS_I2C_CTRL0_POST_SEND_STOP : 0; if (msg->flags & I2C_M_RD) @@ -286,6 +287,7 @@ static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id) { struct mxs_i2c_dev *i2c = dev_id; u32 stat = readl(i2c->regs + MXS_I2C_CTRL1) & MXS_I2C_IRQ_MASK; + bool is_last_cmd; if (!stat) return IRQ_NONE; @@ -300,9 +302,14 @@ static irqreturn_t mxs_i2c_isr(int this_irq, void *dev_id) else i2c->cmd_err = 0; - complete(&i2c->cmd_complete); + is_last_cmd = (readl(i2c->regs + MXS_I2C_QUEUESTAT) & + MXS_I2C_QUEUESTAT_WRITE_QUEUE_CNT_MASK) == 0; + + if (is_last_cmd || i2c->cmd_err) + complete(&i2c->cmd_complete); writel(stat, i2c->regs + MXS_I2C_CTRL1_CLR); + return IRQ_HANDLED; } diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 1e5606185b4..e9c18939eda 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1386,8 +1386,10 @@ int i2c_master_send(const struct i2c_client *client, const char *buf, int count) ret = i2c_transfer(adap, &msg, 1); - /* If everything went ok (i.e. 1 msg transmitted), return #bytes - transmitted, else error code. */ + /* + * If everything went ok (i.e. 1 msg transmitted), return #bytes + * transmitted, else error code. + */ return (ret == 1) ? count : ret; } EXPORT_SYMBOL(i2c_master_send); @@ -1414,8 +1416,10 @@ int i2c_master_recv(const struct i2c_client *client, char *buf, int count) ret = i2c_transfer(adap, &msg, 1); - /* If everything went ok (i.e. 1 msg transmitted), return #bytes - transmitted, else error code. */ + /* + * If everything went ok (i.e. 1 msg received), return #bytes received, + * else error code. + */ return (ret == 1) ? count : ret; } EXPORT_SYMBOL(i2c_master_recv); |