From: Dave Airlie <airlied@linux.ie>
Date: Thu, 12 Nov 2009 05:53:44 +0000 (+1000)
Subject: drm/radeon/kms: read back register before writing in IIO.
X-Git-Tag: v2.6.32~51^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23115b0592bde5da249fcbdad7714c1f96a8e5f5;p=pandora-kernel.git

drm/radeon/kms: read back register before writing in IIO.

This fixes RH bugzilla #527874.

On resume the atom posting wasn't working, however vbe posting was
going fine, after 2 weeks over irc, and 8 hrs with the hardware,
I tracked it down to the memory device table and it access the MC
registers via IIO, it appears the rv515 atom iio table might not
be fully functional, so adding a readback before doing a write
either provides enough delay to make things resume correctly.

Thanks to Peng Huang at Red Hat for coming to Brisbane.

Signed-off-by: Dave Airlie <airlied@redhat.com>
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