[PATCH v2 3/3] i2c: cadence: Check for errata condition involving master receive

Harini Katakam harinikatakamlinux at gmail.com
Thu Dec 4 20:12:30 PST 2014


Hi,

On Fri, Dec 5, 2014 at 12:04 AM, Wolfram Sang <wsa at the-dreams.de> wrote:
>
>> +             /*
>> +              * This controller does not give completion interrupt after a
>> +              * master receive transfer if HOLD bit is set (repeated start),
>> +              * resulting in SW timeout. Hence, if a receive transfer is
>> +              * followed by any other transfer, an error is returned
>> +              * indicating that this sequence is not supported.
>> +              */
>> +             for (count = 0; count < num-1; count++) {
>> +                     if (msgs[count].flags & I2C_M_RD)
>> +                             return -EOPNOTSUPP;
>> +             }
>
> Yeah, a lot better. Probably it would be good to inform the user with a
> warning what went wrong?
>

Sure. I'll add that.

Regards,
Harini



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