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

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Message-ID: <CAFcVECL0ShFp-qSHmO8era3okebA4oO85iz+QRWP6fKAEMiN7A@mail.gmail.com>
Date:	Fri, 5 Dec 2014 09:42:30 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	Mark Rutland <mark.rutland@....com>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"vishnum@...inx.com" <vishnum@...inx.com>
Subject: Re: [PATCH v2 3/3] i2c: cadence: Check for errata condition involving
 master receive

Hi,

On Fri, Dec 5, 2014 at 12:04 AM, Wolfram Sang <wsa@...-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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