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Message-ID: <1332875892_117312@CP5-2952>
Date: Tue, 27 Mar 2012 20:17:59 +0100
From: Chris Wilson <chris@...is-wilson.co.uk>
To: Daniel Kurtz <djkurtz@...omium.org>,
Daniel Vetter <daniel@...ll.ch>,
Keith Packard <keithp@...thp.com>,
David Airlie <airlied@...ux.ie>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: Benson Leung <bleung@...omium.org>,
Yufeng Shen <miletus@...omium.org>,
Daniel Kurtz <djkurtz@...omium.org>
Subject: Re: [PATCH 10/13 v4] drm/i915/intel_i2c: always wait for IDLE before clearing NAK
On Wed, 28 Mar 2012 02:36:19 +0800, Daniel Kurtz <djkurtz@...omium.org> wrote:
> The GMBUS controller can report a NAK condition while a transaction is
> still active. If the driver is fast enough, and the bus is slow enough,
> the driver may clear the NAK condition while the controller is still
> busy, resulting in a confused GMBUS controller. This will leave the
> controller in a bad state such that the next transaction may fail.
>
> Also, return -ENXIO if a device NAKs a transaction.
>
> Note: this patch also refactors gmbus_xfer to remove the "done" label.
>
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
Thanks for clarifying the appropriate return codes.
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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