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

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Date:	Thu, 4 Dec 2014 19:34:07 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Harini Katakam <harinik@...inx.com>
Cc:	mark.rutland@....com, michal.simek@...inx.com,
	soren.brinkmann@...inx.com, linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	vishnum@...inx.com, harinikatakamlinux@...il.com
Subject: Re: [PATCH v2 3/3] i2c: cadence: Check for errata condition
 involving master receive


> +		/*
> +		 * 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?


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