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From: Mika Westerberg <mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: Re: [PATCH] i2c: designware: use enable on resume instead
 initialization
Date: Thu, 11 Jun 2015 12:38:08 +0300
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On Wed, Jun 10, 2015 at 05:05:16PM +0200, christian.ruppert-Yycd8EPnGM5BDgjK7y7TUQ@public.gmane.org wrote:
>    We should understand why the controller was disabled after successful
>    transfers in the first place, however. Maybe some quirk with older
>    versions of the hardware? Mika, do you have any memories about this?

I think it was in the original driver even before I did Intel specific
changes to that. I have no idea why it is done. Probably, like you said,
because some older version of the hardware needed it.