drm/radeon/kms: handle the case of no active displays properly in the bandwidth code
commit
e06b14ee91a2ddefc9a67443a6cd8ee0fa800115 upstream.
Logic was:
if (mode0 && mode1)
else if (mode0)
else
Should be:
if (mode0 && mode1)
else if (mode0)
else if (mode1)
Otherwise we may end up calculating the priority regs with
unitialized values.
Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=16492
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>