drm/radeon: fix resume on some rs4xx boards (v2)
authorAlex Deucher <alexander.deucher@amd.com>
Mon, 26 Aug 2013 21:52:12 +0000 (17:52 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 1 Oct 2013 15:55:47 +0000 (08:55 -0700)
commitd8dcb2c6f47bab3dfd8059e58a3641b37ca70c30
treeca821eebab06864f96b0da167d753deb7a06989b
parentea0f1f563576a598112cd64308ddb461379d85a9
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/radeon/rs400.c