From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
Subject: Re: [PATCH] i2c: imx: retry on NAK
Date: Tue, 18 Feb 2014 18:48:53 +0100
Message-ID: <20140218174853.GC18768@katana>
References: <1378857490-30968-1-git-send-email-luka@openwrt.org>
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To: Luka Perkov <luka-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Tim Harvey <tharvey-UMMOYl/HMS+akBO8gow8eQ@public.gmane.org>
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On Wed, Sep 11, 2013 at 01:58:10AM +0200, Luka Perkov wrote:
> From: Tim Harvey <tharvey-UMMOYl/HMS+akBO8gow8eQ@public.gmane.org>
>=20
> In case of busy i2c try again to get ACK.
>=20
> Signed-off-by: Tim Harvey <tharvey-UMMOYl/HMS+akBO8gow8eQ@public.gmane.org>
> Tested-by: Luka Perkov <luka-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>

-EAGAIN is for lost arbitration (see Documentation/i2c/fault-codes).
In that case, the core will try again. NACK needs to be reported, so the
caller can decide what to do in that case. -ENXIO would be the best
response here.


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