From: Alex Deucher <alexander.deucher@amd.com>
Date: Fri, 20 Jan 2012 19:50:18 +0000 (-0500)
Subject: drm/radeon/kms/dce3+: add support for hw i2c using atom
X-Git-Tag: v3.4-rc1~143^2~113
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30388c6e48e62b2806b14552275f091e2f5adbf4;p=pandora-kernel.git

drm/radeon/kms/dce3+: add support for hw i2c using atom

Starting with DCE3 hardware, atom contains a general purpose
ProcessI2cChannelTransaction similar to ProcessAuxChannelTransaction.

Add an implementation using the atom tables for DCE3+ hardware.

This should be a little less CPU intensive than bit banging and
may work better in certain cases.

Enable it by setting the radeon hw_i2c module parameter to 1.  E.g.,
radeon.hw_i2c=1
on the kernel command line in grub.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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