From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 26 Aug 2013 21:52:12 +0000 (-0400)
Subject: drm/radeon: fix resume on some rs4xx boards (v2)
X-Git-Tag: v3.2.52~106
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f46575554ac083111a3df50ddcd66e62973b49fe;p=pandora-kernel.git

drm/radeon: fix resume on some rs4xx boards (v2)

commit acf88deb8ddbb73acd1c3fa32fde51af9153227f upstream.

Setting MC_MISC_CNTL.GART_INDEX_REG_EN causes hangs on
some boards on resume.  The systems seem to work fine
without touching this bit so leave it as is.

v2: read-modify-write the GART_INDEX_REG_EN bit.
I suspect the problem is that we are losing the other
settings in the register.

fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=52952

Reported-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Daniel Tobias <dan.g.tob@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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