From: Jan Luebbe <jlu@pengutronix.de>
Date: Wed, 8 Jul 2015 14:35:27 +0000 (+0200)
Subject: i2c: omap: fix bus recovery setup
X-Git-Tag: omap-for-v4.3/fixes-merge-window~144^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=828e66c0edf97bcb79b59b1ddd803a50629b3937;p=pandora-kernel.git

i2c: omap: fix bus recovery setup

At least on the AM335x, enabling OMAP_I2C_SYSTEST_ST_EN is not enough to
allow direct access to the SCL and SDA pins. In addition to ST_EN, we
need to set the TMODE to 0b11 (Loop back & SDA/SCL IO mode select).
Also, as the reset values of SCL_O and SDA_O are 0 (which means "drive
low level"), we need to set them to 1 (which means "high-impedance") to
avoid unwanted changes on the pins.

As a precaution, reset all these bits to their default values after
recovery is complete.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

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