From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wolfram Sang <wsa@the-dreams.de>
Date: Fri, 01 Apr 2016 20:14:15 +0000
Subject: Re: [PATCH v3 09/11] i2c: rcar: revoke START request early
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To: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-i2c@vger.kernel.org, linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>, Simon Horman <horms@verge.net.au>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>, "stable@vger.kernel.org" <stable@vger.kernel.org>, "linux-renesas-soc@vger.kernel.org" <linux-renesas-soc@vger.kernel.org>


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> >IIRC my tests showed that if you don't remove
> >the spinlocks (patch 4), the interrupt latency will already be too high
> >again.
>=20
>    Thank you for the valuable info!

Oh, and add patch 6 to it. The context switches are a major problem in
this.


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