From: Harini Katakam <harinik@xilinx.com>
Date: Tue, 13 Jan 2015 18:34:59 +0000 (+0530)
Subject: i2c: cadence: Check for errata condition involving master receive
X-Git-Tag: fixes-v4.0-rc1~32^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a86c3aee0cfec09b35159da9d925157f3e4f2cc;p=pandora-kernel.git

i2c: cadence: Check for errata condition involving master receive

Cadence I2C controller has the following bugs:
- completion indication is not given to the driver at the end of
a read/receive transfer with HOLD bit set.
- Invalid read transaction are generated on the bus when HW timeout
condition occurs with HOLD bit set.

As a result of the above, if a set of messages to be transferred with
repeated start includes any message following a read message,
completion is never indicated and timeout occurs.
Hence a check is implemented to return -EOPNOTSUPP for such sequences.

Signed-off-by: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Vishnu Motghare <vishnum@xilinx.com>
[wsa: fixed some whitespaces]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

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