From: Chris Wilson <chris@chris-wilson.co.uk>
To: Daniel Kurtz <djkurtz@chromium.org>,
Daniel Vetter <daniel@ffwll.ch>,
Keith Packard <keithp@keithp.com>,
David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Cc: Benson Leung <bleung@chromium.org>,
Yufeng Shen <miletus@chromium.org>,
Daniel Kurtz <djkurtz@chromium.org>
Subject: Re: [PATCH 10/13 v4] drm/i915/intel_i2c: always wait for IDLE before clearing NAK
Date: Tue, 27 Mar 2012 20:17:59 +0100 [thread overview]
Message-ID: <1332875892_117312@CP5-2952> (raw)
In-Reply-To: <1332873382-29373-11-git-send-email-djkurtz@chromium.org>
On Wed, 28 Mar 2012 02:36:19 +0800, Daniel Kurtz <djkurtz@chromium.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@chromium.org>
Thanks for clarifying the appropriate return codes.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
next prev parent reply other threads:[~2012-03-27 19:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 18:36 [PATCH 00/13 v4] fix gmbus writes and related issues Daniel Kurtz
2012-03-27 18:36 ` [PATCH 01/13 v4] drm/i915/intel_i2c: refactor gmbus_xfer Daniel Kurtz
2012-03-27 19:09 ` Chris Wilson
2012-03-27 18:36 ` [PATCH 02/13 v4] drm/i915/intel_i2c: cleanup error messages and comments Daniel Kurtz
2012-03-27 18:46 ` Chris Wilson
2012-03-27 18:36 ` [PATCH 03/13 v4] drm/i915/intel_i2c: assign HDMI port D to pin pair 6 Daniel Kurtz
2012-03-27 18:36 ` [PATCH 04/13 v4] drm/i915/intel_i2c: use i2c pre/post_xfer functions to setup gpio xfers Daniel Kurtz
2012-03-27 18:57 ` Chris Wilson
2012-03-27 18:36 ` [PATCH 05/13 v4] drm/i915/intel_i2c: refactor using intel_gmbus_get_adapter Daniel Kurtz
2012-03-27 18:36 ` [PATCH 06/13 v4] drm/i915/intel_i2c: gmbus disabled and reserved ports are invalid Daniel Kurtz
2012-03-27 18:36 ` [PATCH 07/13 v4] drm/i915/intel_i2c: allocate gmbus array as part of drm_i915_private Daniel Kurtz
2012-03-28 13:05 ` Daniel Vetter
2012-03-27 18:36 ` [PATCH 08/13 v4] drm/i915/intel_i2c: handle zero-length writes Daniel Kurtz
2012-03-27 19:14 ` Chris Wilson
2012-03-28 11:32 ` Daniel Kurtz
2012-03-28 11:39 ` Chris Wilson
2012-03-27 18:36 ` [PATCH 09/13 v4] drm/i915/intel_i2c: use double-buffered writes Daniel Kurtz
2012-03-27 18:45 ` Chris Wilson
2012-03-27 18:36 ` [PATCH 10/13 v4] drm/i915/intel_i2c: always wait for IDLE before clearing NAK Daniel Kurtz
2012-03-27 19:17 ` Chris Wilson [this message]
2012-03-27 18:36 ` [PATCH 11/13 v4] drm/i915/intel_i2c: use WAIT cycle, not STOP Daniel Kurtz
2012-03-27 18:36 ` [PATCH 12/13 v4] drm/i915/intel_i2c: use INDEX cycles for i2c read transactions Daniel Kurtz
2012-03-28 13:21 ` Daniel Vetter
2012-03-27 18:36 ` [PATCH 13/13 v4] drm/i915/intel_i2c: reuse GMBUS2 value read in polling loop Daniel Kurtz
2012-03-27 19:02 ` Chris Wilson
2012-03-28 11:39 ` Daniel Kurtz
2012-03-28 11:44 ` Chris Wilson
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