Hi,
thanks for the submission!
> --- a/drivers/i2c/busses/i2c-ibm_iic.c
> +++ b/drivers/i2c/busses/i2c-ibm_iic.c
> @@ -58,6 +58,8 @@ static bool iic_force_fast;
> module_param(iic_force_fast, bool, 0);
> MODULE_PARM_DESC(iic_force_fast, "Force fast mode (400 kHz)");
>
> +#define FIFO_FLUSH_TIMEOUT 100
100 what? The unit is missing.
> @@ -167,8 +170,8 @@ static void iic_dev_init(struct ibm_iic_private* dev)
> /* Clear control register */
> out_8(&iic->cntl, 0);
>
> - /* Enable interrupts if possible */
> - iic_interrupt_mode(dev, dev->irq >= 0);
> + /* Start with each individual interrupt masked*/
Space at the end of comment missing
> static irqreturn_t iic_handler(int irq, void *dev_id)
> {
> - struct ibm_iic_private* dev = (struct ibm_iic_private*)dev_id;
> - struct iic_regs __iomem *iic = dev->vaddr;
> -
> - DBG2(dev, "irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
> - in_8(&iic->sts), in_8(&iic->extsts));
> -
> - /* Acknowledge IRQ and wakeup iic_wait_for_tc */
> - out_8(&iic->sts, STS_IRQA | STS_SCMP);
> - wake_up_interruptible(&dev->wq);
> -
> + struct ibm_iic_private *dev = (struct ibm_iic_private *) dev_id;
> + iic_xfer_bytes(dev);
Is iic_xfer_bytes later used when polling, too? Otherwise it could be
simply inserted here.
> + if ((status & STS_ERR) ||
> + (ext_status & (EXTSTS_LA | EXTSTS_ICT | EXTSTS_XFRA))) {
> + DBG(dev, "status 0x%x\n", status);
> + DBG(dev, "extended status 0x%x\n", ext_status);
> + if (status & STS_ERR)
> + ERR(dev, "Error detected\n");
> + if (ext_status & EXTSTS_LA)
> + DBG(dev, "Lost arbitration\n");
> + if (ext_status & EXTSTS_ICT)
> + ERR(dev, "Incomplete transfer\n");
> + if (ext_status & EXTSTS_XFRA)
> + ERR(dev, "Transfer aborted\n");
> +
> + dev->status = -EIO;
You could consider returning different fault codes for the different
states. See Documentation/i2c/fault-codes for a guide.
> + if (dev->msgs == NULL) {
> + DBG(dev, "spurious !!!!!\n");
> + dev->status = -EINVAL;
> + return dev->status;
> + }
Does that really happen?
And it introduces a build warning:
drivers/i2c/busses/i2c-ibm_iic.c:410:12: warning: 'iic_wait_for_tc' defined but not used [-Wunused-function]
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