drm/ast: Don't assume DVO enabled means SIL164 on uninitialized chips
It looks like the AST2400 comes up with the DVO enable bit set,
which causes us to incorrectly assume we have a SIL164 regardless
of the value of the scratch registers setup by the BMC firmware.
So let's limit that test to the case where the chip has already
been setup by a BIOS.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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