On Tue, Jun 26, 2018 at 8:01 PM, Manivannan Sadhasivam
<manivannan.sadhasivam@xxxxxxxxxx> wrote:
> On Mon, Jun 25, 2018 at 12:38:50PM +0300, Andy Shevchenko wrote:
>> On Sat, Jun 23, 2018 at 7:11 PM, Manivannan Sadhasivam
>> <manivannan.sadhasivam@xxxxxxxxxx> wrote:
>> > +#define OWL_I2C_REG_CTL (0x0000)
>> > +#define OWL_I2C_REG_CLKDIV (0x0004)
>> > +#define OWL_I2C_REG_STAT (0x0008)
>> > +#define OWL_I2C_REG_ADDR (0x000C)
>> > +#define OWL_I2C_REG_TXDAT (0x0010)
>> > +#define OWL_I2C_REG_RXDAT (0x0014)
>> > +#define OWL_I2C_REG_CMD (0x0018)
>> > +#define OWL_I2C_REG_FIFOCTL (0x001C)
>> > +#define OWL_I2C_REG_FIFOSTAT (0x0020)
>> > +#define OWL_I2C_REG_DATCNT (0x0024)
>> > +#define OWL_I2C_REG_RCNT (0x0028)
>>
>> I don't understand why these have parents?
>>
>
> I'm not sure what you mean here! Can you please elaborate?
One has to read 'parens'. Sorry for confusion.
>> > +#define OWL_I2C_TIMEOUT (msecs_to_jiffies(4 * 1000))
>>
>> Ditto.
> Same as above
Ditto.
>> > + /* Wait until FIFO reset complete */
>> > + do {
>> > + val = readl(i2c_dev->base + OWL_I2C_REG_FIFOCTL);
>> > + if (!(val & (OWL_I2C_FIFOCTL_RFR | OWL_I2C_FIFOCTL_TFR)))
>> > + break;
>> > + } while (1);
>>
>> No way. Get rid of infinite loop.
> Okay. Can I change it to max of 50 retries with 1ms delay?
Whatever suitable for HW. Rely on datasheet or other source of
information about this timeouts.
>> > +static irqreturn_t owl_i2c_interrupt(int irq, void *_dev)
>> > + dev_warn(&i2c_dev->adap.dev, "received NACK from device");
>>
>> And if it happens hundreds times in a row?
> Should I change it to dev_dbg?
>> > + dev_warn(&i2c_dev->adap.dev, "bus error");
> Same as above?
ratelimit, another level, tracepoints, getting rid of them completely
— your call.
--
With Best Regards,
Andy Shevchenko
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