diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 39 |
1 files changed, 14 insertions, 25 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index bfb42f0f87a..5fce1a07e6c 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -149,7 +149,6 @@ static char *abort_sources[] = { * @dev: driver model device node * @base: IO registers pointer * @cmd_complete: tx completion indicator - * @pump_msg: continue in progress transfers * @lock: protect this struct and IO registers * @clk: input reference clock * @cmd_err: run time hadware error code @@ -175,7 +174,6 @@ struct dw_i2c_dev { struct device *dev; void __iomem *base; struct completion cmd_complete; - struct tasklet_struct pump_msg; struct mutex lock; struct clk *clk; int cmd_err; @@ -325,7 +323,7 @@ static int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev) /* * Initiate low level master read/write transaction. * This function is called from i2c_dw_xfer when starting a transfer. - * This function is also called from dw_i2c_pump_msg to continue a transfer + * This function is also called from i2c_dw_isr to continue a transfer * that is longer than the size of the TX FIFO. */ static void @@ -489,10 +487,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) /* no error */ if (likely(!dev->cmd_err)) { - /* read rx fifo, and disable the adapter */ - do { - i2c_dw_read(dev); - } while (dev->status & STATUS_READ_IN_PROGRESS); + /* Disable the adapter */ writel(0, dev->base + DW_IC_ENABLE); ret = num; goto done; @@ -520,20 +515,6 @@ static u32 i2c_dw_func(struct i2c_adapter *adap) return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR; } -static void dw_i2c_pump_msg(unsigned long data) -{ - struct dw_i2c_dev *dev = (struct dw_i2c_dev *) data; - u32 intr_mask; - - i2c_dw_read(dev); - i2c_dw_xfer_msg(dev); - - intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT; - if (dev->status & STATUS_WRITE_IN_PROGRESS) - intr_mask |= DW_IC_INTR_TX_EMPTY; - writel(intr_mask, dev->base + DW_IC_INTR_MASK); -} - static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev) { u32 stat; @@ -604,10 +585,19 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id) if (stat & DW_IC_INTR_TX_ABRT) { dev->cmd_err |= DW_IC_ERR_TX_ABRT; dev->status = STATUS_IDLE; - } else if (stat & DW_IC_INTR_TX_EMPTY) - tasklet_schedule(&dev->pump_msg); + } + + if (stat & DW_IC_INTR_TX_EMPTY) { + i2c_dw_read(dev); + i2c_dw_xfer_msg(dev); + } + + /* + * No need to modify or disable the interrupt mask here. + * i2c_dw_xfer_msg() will take care of it according to + * the current transmit status. + */ - writel(0, dev->base + DW_IC_INTR_MASK); /* disable interrupts */ if (stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) complete(&dev->cmd_complete); @@ -653,7 +643,6 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev) } init_completion(&dev->cmd_complete); - tasklet_init(&dev->pump_msg, dw_i2c_pump_msg, (unsigned long) dev); mutex_init(&dev->lock); dev->dev = get_device(&pdev->dev); dev->irq = irq; |