From: Mikko Perttunen <mperttunen@nvidia.com>
Date: Fri, 5 Sep 2014 09:28:18 +0000 (+0300)
Subject: i2c: tegra: Move clk_prepare/clk_set_rate to probe
X-Git-Tag: fixes-for-v3.18-merge-window~67^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9a9ef4170b3db3044504cd5512d0bb19c6f23c7;p=pandora-kernel.git

i2c: tegra: Move clk_prepare/clk_set_rate to probe

Currently the i2c-tegra bus driver prepares, enables
and set_rates its clocks separately for each transfer.
This causes locking problems when doing I2C transfers
from clock notifiers; see
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/268653.html

This patch moves clk_prepare/unprepare and clk_set_rate calls to
the probe function, leaving only clk_enable/disable to be
done on each transfer. This solves the locking issue.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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